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class="vector-toc-numb">5</span> <span>Common features</span> </div> </a> <button aria-controls="toc-Common_features-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Common features subsection</span> </button> <ul id="toc-Common_features-sublist" class="vector-toc-list"> <li id="toc-Line_styles_and_types" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Line_styles_and_types"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Line styles and types</span> </div> </a> <ul id="toc-Line_styles_and_types-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Multiple_views_and_projections" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Multiple_views_and_projections"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2</span> <span>Multiple views and projections</span> </div> </a> <ul id="toc-Multiple_views_and_projections-sublist" class="vector-toc-list"> <li id="toc-Multiview_projection" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Multiview_projection"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.1</span> <span>Multiview projection</span> </div> </a> <ul id="toc-Multiview_projection-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Auxiliary_views" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Auxiliary_views"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.2</span> <span>Auxiliary views</span> </div> </a> <ul id="toc-Auxiliary_views-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Isometric_projection" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Isometric_projection"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.3</span> <span>Isometric projection</span> </div> </a> <ul id="toc-Isometric_projection-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Oblique_projection" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Oblique_projection"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.4</span> <span>Oblique projection</span> </div> </a> <ul id="toc-Oblique_projection-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Perspective_projection" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Perspective_projection"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.5</span> <span>Perspective projection</span> </div> </a> <ul id="toc-Perspective_projection-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Section_Views" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Section_Views"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.2.6</span> <span>Section Views</span> </div> </a> <ul id="toc-Section_Views-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Scale" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Scale"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.3</span> <span>Scale</span> </div> </a> <ul id="toc-Scale-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Showing_dimensions" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Showing_dimensions"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.4</span> <span>Showing dimensions</span> </div> </a> <ul id="toc-Showing_dimensions-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sizes_of_drawings" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sizes_of_drawings"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.5</span> <span>Sizes of drawings</span> </div> </a> <ul id="toc-Sizes_of_drawings-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Technical_lettering" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Technical_lettering"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.6</span> <span>Technical lettering</span> </div> </a> <ul id="toc-Technical_lettering-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Conventional_parts_(areas)" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Conventional_parts_(areas)"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Conventional parts (areas)</span> </div> </a> <button aria-controls="toc-Conventional_parts_(areas)-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Conventional parts (areas) subsection</span> </button> <ul id="toc-Conventional_parts_(areas)-sublist" class="vector-toc-list"> <li id="toc-Title_block" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Title_block"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.1</span> <span>Title block</span> </div> </a> <ul id="toc-Title_block-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Revisions_block" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Revisions_block"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.2</span> <span>Revisions block</span> </div> </a> <ul id="toc-Revisions_block-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Next_assembly" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Next_assembly"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.3</span> <span>Next assembly</span> </div> </a> <ul id="toc-Next_assembly-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Notes_list" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Notes_list"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.4</span> <span>Notes list</span> </div> </a> <ul id="toc-Notes_list-sublist" class="vector-toc-list"> <li id="toc-General_notes" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#General_notes"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.4.1</span> <span>General notes</span> </div> </a> <ul id="toc-General_notes-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Flagnotes" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Flagnotes"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.4.2</span> <span>Flagnotes</span> </div> </a> <ul id="toc-Flagnotes-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Field_of_the_drawing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Field_of_the_drawing"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.5</span> <span>Field of the drawing</span> </div> </a> <ul id="toc-Field_of_the_drawing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-List_of_materials,_bill_of_materials,_parts_list" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#List_of_materials,_bill_of_materials,_parts_list"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.6</span> <span>List of materials, bill of materials, parts list</span> </div> </a> <ul id="toc-List_of_materials,_bill_of_materials,_parts_list-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Parameter_tabulations" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Parameter_tabulations"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.7</span> <span>Parameter tabulations</span> </div> </a> <ul id="toc-Parameter_tabulations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Views_and_sections" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Views_and_sections"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.8</span> <span>Views and sections</span> </div> </a> <ul id="toc-Views_and_sections-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Zones" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Zones"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.9</span> <span>Zones</span> </div> </a> <ul id="toc-Zones-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Abbreviations_and_symbols" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Abbreviations_and_symbols"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Abbreviations and symbols</span> </div> </a> <ul id="toc-Abbreviations_and_symbols-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Example" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Example"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Example</span> </div> </a> <ul id="toc-Example-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Legal_instruments" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Legal_instruments"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Legal instruments</span> </div> </a> <ul id="toc-Legal_instruments-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Relationship_to_model-based_definition_(MBD/DPD)" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Relationship_to_model-based_definition_(MBD/DPD)"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>Relationship to model-based definition (MBD/DPD)</span> </div> </a> <ul id="toc-Relationship_to_model-based_definition_(MBD/DPD)-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">12</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Bibliography" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Bibliography"> <div class="vector-toc-text"> <span class="vector-toc-numb">13</span> <span>Bibliography</span> </div> </a> <ul id="toc-Bibliography-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Further_reading" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#Further_reading"> <div class="vector-toc-text"> <span class="vector-toc-numb">14</span> <span>Further reading</span> </div> </a> <ul id="toc-Further_reading-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">15</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Engineering drawing</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" 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Available in 26 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-26" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">26 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B1%D8%B3%D9%85_%D9%87%D9%86%D8%AF%D8%B3%D9%8A" title="رسم هندسي – Arabic" lang="ar" hreflang="ar" data-title="رسم هندسي" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Dibuxu_d%27inxenier%C3%ADa" title="Dibuxu d'inxeniería – Asturian" lang="ast" hreflang="ast" data-title="Dibuxu d'inxeniería" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target"><span>Asturianu</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%98%D0%BD%D0%B6%D0%B5%D0%BD%D0%B5%D1%80%D0%BB%D0%B0_%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D0%BA%D0%B0" title="Инженерла графика – Chuvash" lang="cv" hreflang="cv" data-title="Инженерла графика" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Technick%C3%BD_v%C3%BDkres" title="Technický výkres – Czech" lang="cs" hreflang="cs" data-title="Technický výkres" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Technische_Zeichnung" title="Technische Zeichnung – German" lang="de" hreflang="de" data-title="Technische Zeichnung" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Joonis" title="Joonis – Estonian" lang="et" hreflang="et" data-title="Joonis" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Dibujo_de_ingenier%C3%ADa" title="Dibujo de ingeniería – Spanish" lang="es" hreflang="es" data-title="Dibujo de ingeniería" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B1%D8%B3%D9%85_%D9%81%D9%86%DB%8C_%D9%88_%D9%85%D9%87%D9%86%D8%AF%D8%B3%DB%8C" title="رسم فنی و مهندسی – Persian" lang="fa" hreflang="fa" data-title="رسم فنی و مهندسی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EA%B3%B5%ED%95%99%EB%8F%84%EB%A9%B4" title="공학도면 – Korean" lang="ko" hreflang="ko" data-title="공학도면" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BB%D5%B6%D5%AA%D5%A5%D5%B6%D5%A5%D6%80%D5%A1%D5%AF%D5%A1%D5%B6_%D5%A3%D6%80%D5%A1%D6%86%D5%AB%D5%AF%D5%A1" title="Ինժեներական գրաֆիկա – Armenian" lang="hy" hreflang="hy" data-title="Ինժեներական գրաֆիկա" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%87%E0%A4%82%E0%A4%9C%E0%A5%80%E0%A4%A8%E0%A4%BF%E0%A4%AF%E0%A4%B0%E0%A5%80_%E0%A4%9A%E0%A4%BF%E0%A4%A4%E0%A5%8D%E0%A4%B0%E0%A4%A3" title="इंजीनियरी चित्रण – Hindi" lang="hi" hreflang="hi" data-title="इंजीनियरी चित्रण" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/In%C5%BEeniergrafika" title="Inženiergrafika – Latvian" lang="lv" hreflang="lv" data-title="Inženiergrafika" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Lukisan_kejuruteraan" title="Lukisan kejuruteraan – Malay" lang="ms" hreflang="ms" data-title="Lukisan kejuruteraan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A2%D0%B5%D1%85%D0%BD%D0%B8%D0%BA%D0%B8%D0%B9%D0%BD_%D0%B7%D1%83%D1%80%D0%B0%D0%B3" title="Техникийн зураг – Mongolian" lang="mn" hreflang="mn" data-title="Техникийн зураг" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E8%A8%AD%E8%A8%88%E5%9B%B3" title="設計図 – Japanese" lang="ja" hreflang="ja" data-title="設計図" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Rysunek_techniczny_maszynowy" title="Rysunek techniczny maszynowy – Polish" lang="pl" hreflang="pl" data-title="Rysunek techniczny maszynowy" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Desenho_mec%C3%A2nico" title="Desenho mecânico – Portuguese" lang="pt" hreflang="pt" data-title="Desenho mecânico" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%98%D0%BD%D0%B6%D0%B5%D0%BD%D0%B5%D1%80%D0%BD%D0%B0%D1%8F_%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D0%BA%D0%B0" title="Инженерная графика – Russian" lang="ru" hreflang="ru" data-title="Инженерная графика" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Koneenpiirustus" title="Koneenpiirustus – Finnish" lang="fi" hreflang="fi" data-title="Koneenpiirustus" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-tl mw-list-item"><a href="https://tl.wikipedia.org/wiki/Larawang-guhit_na_pang-inhenyeriya" title="Larawang-guhit na pang-inhenyeriya – Tagalog" lang="tl" hreflang="tl" data-title="Larawang-guhit na pang-inhenyeriya" data-language-autonym="Tagalog" 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.hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"Engineering Drawing" redirects here. For the book by Thomas Ewing French, see <a href="/wiki/Engineering_Drawing_(textbook)" class="mw-redirect" title="Engineering Drawing (textbook)">Engineering Drawing (textbook)</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Engineering_drawing" title="Special:EditPage/Engineering drawing">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Engineering+drawing%22">"Engineering drawing"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Engineering+drawing%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Engineering+drawing%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Engineering+drawing%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Engineering+drawing%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Engineering+drawing%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">September 2009</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:DIN_69893_hsk_63a_drawing.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/DIN_69893_hsk_63a_drawing.png/220px-DIN_69893_hsk_63a_drawing.png" decoding="async" width="220" height="122" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/03/DIN_69893_hsk_63a_drawing.png/330px-DIN_69893_hsk_63a_drawing.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/03/DIN_69893_hsk_63a_drawing.png/440px-DIN_69893_hsk_63a_drawing.png 2x" data-file-width="611" data-file-height="340" /></a><figcaption>Engineering drawing of a <a 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.sidebar{width:100%!important;clear:both;float:none!important;margin-left:0!important;margin-right:0!important}}body.skin--responsive .mw-parser-output .sidebar a>img{max-width:none!important}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><table class="sidebar sidebar-collapse nomobile nowraplinks"><tbody><tr><td class="sidebar-pretitle">Part of series on</td></tr><tr><th class="sidebar-title-with-pretitle">Technical drawings</th></tr><tr><td class="sidebar-image"><span typeof="mw:File"><a href="/wiki/File:AcotacionTecnico.svg" class="mw-file-description" title="AcotacionTecnico"><img alt="AcotacionTecnico" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/AcotacionTecnico.svg/127px-AcotacionTecnico.svg.png" decoding="async" width="127" height="129" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a4/AcotacionTecnico.svg/191px-AcotacionTecnico.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a4/AcotacionTecnico.svg/254px-AcotacionTecnico.svg.png 2x" data-file-width="537" data-file-height="546" /></a></span></td></tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible"><div class="sidebar-list-title" style="color: var(--color-base)">By field</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Architectural_drawing" title="Architectural drawing">Architectural drawing</a> <ul><li><a href="/wiki/Floor_plan" title="Floor plan">Floor plan</a></li></ul></li> <li><a href="/wiki/Electrical_drawing" title="Electrical drawing">Electrical drawing</a></li> <li><a class="mw-selflink selflink">Engineering drawing</a></li> <li><a href="/wiki/Plumbing_drawing" title="Plumbing drawing">Plumbing drawing</a></li> <li><a href="/wiki/Structural_drawing" title="Structural drawing">Structural drawing</a></li> <li><a href="/wiki/Scientific_illustration" class="mw-redirect" title="Scientific illustration">Scientific illustration</a></li> <li><a href="/wiki/Mechanical_systems_drawing" title="Mechanical systems drawing">Mechanical systems drawing</a></li> <li><a href="/wiki/Working_drawing" class="mw-redirect" title="Working drawing">Working drawing</a></li> <li><a href="/wiki/Archaeological_illustration" title="Archaeological illustration">Archaeological illustration</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Types</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Sketch_(drawing)" title="Sketch (drawing)">Sketches</a></li> <li><a href="/wiki/Blueprint" title="Blueprint">Blueprint</a></li> <li><a href="/wiki/Technical_drawing" title="Technical drawing">Technical drawing</a></li> <li><a href="/wiki/Assembly_drawing" class="mw-redirect" title="Assembly drawing">Assembly drawing</a></li> <li><a href="/wiki/Cross_section_(geometry)" title="Cross section (geometry)">Cross section</a></li> <li><a href="/wiki/Cutaway_diagram" class="mw-redirect" title="Cutaway diagram">Cutaway diagram</a></li> <li><a href="/wiki/Line_art" title="Line art">Line drawings</a></li> <li><a href="/wiki/Patent_drawings" class="mw-redirect" title="Patent drawings">Patent drawings</a></li> <li><a href="/wiki/Technical_illustration" title="Technical illustration">Technical illustration</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)"><a href="/wiki/CAD" class="mw-redirect" title="CAD">CAD</a></div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Product_and_manufacturing_information" title="Product and manufacturing information">Product and manufacturing information</a></li> <li><a href="/wiki/Exploded_view" class="mw-redirect" title="Exploded view">Exploded view</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">Standards</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><b>INT</b>: <a href="/wiki/ISO_128" title="ISO 128">ISO 128</a></li> <li><b>US</b>: <a href="/wiki/ANSI/ASME_Y14.1" title="ANSI/ASME Y14.1">ANSI/ASME Y14.1</a></li> <li><b>RU</b>: <a href="/wiki/Unified_System_for_Design_Documentation_(Russia)" title="Unified System for Design Documentation (Russia)">ESKD</a></li></ul></div></div></td> </tr><tr><td class="sidebar-content"> <div class="sidebar-list mw-collapsible mw-collapsed"><div class="sidebar-list-title" style="color: var(--color-base)">See also</div><div class="sidebar-list-content mw-collapsible-content"> <ul><li><a href="/wiki/Outline_of_drawing_and_drawings" title="Outline of drawing and drawings">Outline of drawing and drawings</a></li> <li><a href="/wiki/3D_projection" title="3D projection">3D projection</a></li></ul></div></div></td> </tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Technical_drawings" title="Template:Technical drawings"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/w/index.php?title=Template_talk:Technical_drawings&action=edit&redlink=1" class="new" title="Template talk:Technical drawings (page does not exist)"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Technical_drawings" title="Special:EditPage/Template:Technical drawings"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table><p>An <b>engineering drawing</b> is a type of <a href="/wiki/Technical_drawing" title="Technical drawing">technical drawing</a> that is used to convey information about an object. A common use is to specify the geometry necessary for the construction of a component and is called a <b>detail drawing</b>. Usually, a number of drawings are necessary to completely specify even a simple component. These drawings are linked together by a "master drawing." This "master drawing" is more commonly known as an <b>assembly drawing</b>. The assembly drawing gives the <i>drawing numbers</i> of the subsequent detailed components, quantities required, construction materials and possibly 3D images that can be used to locate individual items. Although mostly consisting of pictographic representations, <a href="/wiki/Engineering_drawing_abbreviations_and_symbols" title="Engineering drawing abbreviations and symbols">abbreviations and symbols</a> are used for brevity and additional textual explanations may also be provided to convey the necessary information. </p><p>The process of producing engineering drawings is often referred to as <a href="/wiki/Technical_drawing" title="Technical drawing">technical drawing</a> or <b>drafting</b> (<b>draughting</b>).<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Drawings typically contain <a href="/wiki/Multiview_projection" class="mw-redirect" title="Multiview projection">multiple views</a> of a component, although additional <i>scratch views</i> may be added of <i>details</i> for further explanation. Only the information that is a <i>requirement</i> is typically specified. Key information such as <i>dimensions</i> is usually only specified in one place on a drawing, avoiding redundancy and the possibility of inconsistency. Suitable <a href="/wiki/Engineering_tolerance" title="Engineering tolerance">tolerances</a> are given for critical dimensions to allow the component to be manufactured and function. More detailed <a href="/w/index.php?title=Production_drawing&action=edit&redlink=1" class="new" title="Production drawing (page does not exist)">production drawings</a> may be produced based on the information given in an engineering drawing. Drawings have an information box or <i>title block</i> containing who drew the drawing, who approved it, units of dimensions, meaning of views, the title of the drawing and the drawing number. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As a necessary means for visually conveying ideas, technical drawing has been in one form or another a part of human history since antiquity. The use of these early drawings was to express architectural and engineering concepts for large cultural structures: the temples, monuments, and public infrastructure. Basic forms of technical drawing were used by the Egyptians and Mesopotamians to create highly detailed irrigation systems, pyramids, and other such sophisticated structures. But their methods were, comparatively easy, yet needed a great deal of skill and accuracy. Even in their primitive form, they gave the construction a drawing for structures that would stand the test of time.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>With the invention of technical drawing in ancient Greece and Rome technical drawing, they have further evolved. Works by Vitruvius and other engineers and architects such as Vitruvius used drawings as a medium for the transmission of construction techniques, and the illustration of the basic principles of balance and proportion in architecture. Early examples of what would lead to more formal technical drawing practices included the drawings and geometric calculations used to construct aqueducts, bridges, and fortresses. Technical drawings also figured in the 12th-century design of cathedrals and castles, albeit such drawings were more typically produced by artisans and stonemasons, not formally trained engineers.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>The Renaissance was a period of great success for technical drawing. These inventive artists and inventors were starting to use sophisticated methods of visual representation within their work as well as a methodical adherence to accuracy. His notebooks contained drawings of mechanical devices anatomical studies, and engineering projects that demonstrated his advanced understanding of form, function, and proportion, as elucidated by his notebooks. Perhaps he was the first of the pioneers who combined the arts with engineering ability to produce technical drawings at once imaginative and instructive. It was an important foundation for future developments in technical drawing work.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>As the Industrial Revolution took hold, modern engineering drawing took shape with the emergence of strictly specified conventions like drawing in orthographic projection, exploding, and standard scales. Part of the movement towards standardization was somewhat triggered by the development of engineering education and uniform drawing techniques in France. During the same period, the French mathematician Gaspard Monge developed descriptive geometry, a means of representing three-dimensional objects in two-dimensional space, and contributed to technical drawing in a major way. His work set the ground for orthographic projection which is one of the core techniques to be used in technical drawing today. Monge's methods were disseminated initially as a military secret, then far and wide, and his methods shaped the future of engineering education, and also the engineering practice. </p><p>Further contributions to the craft of technical drawing were made by pioneers like Marc Isambard Brunel. L. T. C. Rolt's biography of Isambard Kingdom Brunel, to whom Marc contributed in 1799 with his detailed drawings of block-making machinery, testified to the developing nature of British engineering methods. By applying what we now call mechanical drawing techniques to depict three-dimensional machinery on a two-dimensional plane more efficient manufacturing processes as well as greater precision were enabled. These innovations were essential as the world began to move toward mechanized production, and complex engineering projects, such as bridges, railways, and ships, required highly detailed and accurate technical representations to succeed. </p><p>This increasing need for a degree of precision in technical drawings during the 19th century was a direct result of the Industrial Revolution. In this era, we have seen the development of large-scale engineering projects such as railways, steam engines, and iron structures which require a heightened degree of accuracy and standardization. New conventions and symbols were created by engineers; the use of which became standardized throughout industries, so that any person who could read a technical drawing could know the specifications of a component or structure. The standardization process helped engineer practices to become standardized, making it easier for engineers, manufacturers, and builders to work together. </p><p>In the 20th century, technical drawing underwent yet another transformation with the introduction of drafting tools such as the T-square, compasses, and protractors. These tools helped drafters achieve the high degree of precision necessary for increasingly complex projects, such as skyscrapers, airplanes, and automobiles. The establishment of standards such as the American National Standards Institute (ANSI) and International Organization for Standardization (ISO) further formalized technical drawing conventions, ensuring consistency in engineering practices around the world.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Today, technical drawing has largely transitioned from manual drafting to computer-aided design (CAD). CAD software has revolutionized the way technical drawings are created, allowing for faster, more precise, and easily modifiable drawings. Engineers can now visualize designs in three dimensions, simulate performance, and make adjustments before any physical prototype is built. This digital transformation has not only increased efficiency but also broadened the possibilities for innovation, enabling engineers to tackle challenges that were previously unimaginable. </p><p>However, despite the advent of digital tools, the fundamental principles of technical drawing remain rooted in its history. Precision, clarity, and the ability to convey complex information visually are still at the core of technical drawing. The conventions established over centuries—from orthographic projection to the use of scale and dimension lines—continue to be essential in modern engineering and architectural practice. The evolution of technical drawing is a testament to human ingenuity, demonstrating how the ability to convey complex ideas visually has been pivotal in the advancement of civilization. </p> <div class="mw-heading mw-heading2"><h2 id="Standardization_and_disambiguation">Standardization and disambiguation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=2" title="Edit section: Standardization and disambiguation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Engineering drawings specify the requirements of a component or assembly which can be complicated. Standards provide rules for their specification and interpretation. Standardization also aids <a href="/wiki/Internationalization" title="Internationalization">internationalization</a>, because people from different countries who speak different languages can read the same engineering drawing, and interpret it the same way. </p><p>One major set of engineering drawing standards is <a href="/wiki/American_Society_of_Mechanical_Engineers" title="American Society of Mechanical Engineers">ASME</a> Y14.5 and Y14.5M (most recently revised in 2018). These apply widely in the United States, although <a rel="nofollow" class="external text" href="https://www.iso.org/obp/ui/#iso:std:iso:8015:ed-2:v1:en">ISO 8015 (Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules)</a> is now also important. In 2018, <a href="/wiki/American_Society_of_Mechanical_Engineers" title="American Society of Mechanical Engineers">ASME</a> AED-1 was created to develop advanced practices unique to aerospace and other industries and supplement to Y14.5 Standards. </p><p>In 2011, a new revision of <a rel="nofollow" class="external text" href="https://www.iso.org/obp/ui/#iso:std:iso:8015:ed-2:v1:en">ISO 8015 (Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules)</a> was published containing the Invocation Principle. This states that, "Once a portion of the ISO geometric product specification (GPS) system is invoked in a mechanical engineering product documentation, the entire ISO GPS system is invoked." It also goes on to state that marking a drawing "Tolerancing ISO 8015" is optional. The implication of this is that any drawing using ISO symbols can only be interpreted to ISO GPS rules. The only way not to invoke the ISO GPS system is to invoke a national or other standard. Britain, <a href="/wiki/BS_8888" title="BS 8888">BS 8888</a> (Technical Product Specification) has undergone important updates in the 2010s. </p> <div class="mw-heading mw-heading2"><h2 id="Media">Media</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=3" title="Edit section: Media"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg/220px-Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg" decoding="async" width="220" height="142" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg/330px-Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg/440px-Typical_roadway_cross-section_sheet_in_transportation_engineering.jpg 2x" data-file-width="10200" data-file-height="6600" /></a><figcaption>A <a href="/wiki/Cross_section_(geometry)" title="Cross section (geometry)">typical cross-section drawing</a> of a roadway.</figcaption></figure> <p>For centuries, until the 1970s, all engineering drawing was done manually by using pencil and pen on paper or other substrate (e.g., <a href="/wiki/Vellum" title="Vellum">vellum</a>, <a href="/wiki/Mylar" class="mw-redirect" title="Mylar">mylar</a>). Since the advent of <a href="/wiki/Computer-aided_design" title="Computer-aided design">computer-aided design</a> (CAD), engineering drawing has been done more and more in the electronic medium with each passing decade. Today most engineering drawing is done with CAD, but pencil and paper have not entirely disappeared. </p><p>Some of the <a href="/wiki/Technical_drawing_tools" class="mw-redirect" title="Technical drawing tools">tools of manual drafting</a> include pencils, pens and their ink, <a href="/wiki/Straightedge" title="Straightedge">straightedges</a>, <a href="/wiki/T-square" title="T-square">T-squares</a>, <a href="/wiki/French_curve" title="French curve">French curves</a>, triangles, <a href="/wiki/Ruler" title="Ruler">rulers</a>, <a href="/wiki/Protractor" class="mw-redirect" title="Protractor">protractors</a>, <a href="/wiki/Caliper#Divider_caliper" class="mw-redirect" title="Caliper">dividers</a>, <a href="/wiki/Compass_(drafting)" class="mw-redirect" title="Compass (drafting)">compasses</a>, scales, erasers, and tacks or push pins. (<a href="/wiki/Slide_rule" title="Slide rule">Slide rules</a> used to number among the supplies, too, but nowadays even manual drafting, when it occurs, benefits from a pocket <a href="/wiki/Calculator" title="Calculator">calculator</a> or its onscreen equivalent.) And of course the tools also include drawing boards (drafting boards) or tables. The English idiom "to go back to the drawing board", which is a figurative phrase meaning to rethink something altogether, was inspired by the literal act of discovering design errors during production and returning to a drawing board to revise the engineering drawing. <a href="/wiki/Drafting_machine" title="Drafting machine">Drafting machines</a> are devices that aid manual drafting by combining drawing boards, straightedges, <a href="/wiki/Pantograph" title="Pantograph">pantographs</a>, and other tools into one integrated drawing environment. CAD provides their virtual equivalents. </p><p>Producing drawings usually involves creating an original that is then reproduced, generating multiple copies to be distributed to the shop floor, vendors, company archives, and so on. The classic reproduction methods involved blue and white appearances (whether <a href="/wiki/Blueprint" title="Blueprint">white-on-blue</a> or <a href="/wiki/Whiteprint" title="Whiteprint">blue-on-white</a>), which is why engineering drawings were long called, and even today are still often called, "<a href="/wiki/Blueprint" title="Blueprint">blueprints</a>" or "<a href="/wiki/Whiteprint" title="Whiteprint">bluelines</a>", even though those terms are <a href="/wiki/Anachronism" title="Anachronism">anachronistic</a> from a literal perspective, since most copies of engineering drawings today are made by more modern methods (often <a href="/wiki/Inkjet_printer" class="mw-redirect" title="Inkjet printer">inkjet</a> or <a href="/wiki/Laser_printer" class="mw-redirect" title="Laser printer">laser</a> printing) that yield black or multicolour lines on white paper. The more generic term "print" is now in common usage in the US to mean any paper copy of an engineering drawing. In the case of CAD drawings, the original is the CAD file, and the <a href="/wiki/Printout" class="mw-redirect" title="Printout">printouts</a> of that file are the "prints". </p> <div class="mw-heading mw-heading2"><h2 id="Systems_of_dimensioning_and_tolerancing">Systems of dimensioning and tolerancing</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=4" title="Edit section: Systems of dimensioning and tolerancing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Almost all engineering drawings (except perhaps reference-only views or initial sketches) communicate not only geometry (shape and location) but also dimensions and <a href="/wiki/Engineering_tolerance" title="Engineering tolerance">tolerances</a><sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> for those characteristics. Several systems of dimensioning and tolerancing have evolved. The simplest dimensioning system just specifies distances between points (such as an object's length or width, or hole center locations). Since the advent of well-developed <a href="/wiki/Interchangeable_parts" title="Interchangeable parts">interchangeable manufacture</a>, these distances have been accompanied by tolerances of the plus-or-minus or min-and-max-limit types. <i>Coordinate dimensioning</i> involves defining all points, lines, planes, and profiles in terms of Cartesian coordinates, with a common origin. Coordinate dimensioning was the sole best option until the post-World War II era saw the development of <a href="/wiki/Geometric_dimensioning_and_tolerancing" title="Geometric dimensioning and tolerancing">geometric dimensioning and tolerancing</a> (GD&T), which departs from the limitations of coordinate dimensioning (e.g., rectangular-only tolerance zones, tolerance stacking) to allow the most logical tolerancing of both geometry and dimensions (that is, both form [shapes/locations] and sizes). <span typeof="mw:File"><a href="/wiki/File:Technical_drawing,_1891.jpg" class="mw-file-description" title="Technical drawing, 1891"><img alt="Technical drawing, 1891" src="//upload.wikimedia.org/wikipedia/commons/thumb/3/39/Technical_drawing%2C_1891.jpg/440px-Technical_drawing%2C_1891.jpg" decoding="async" width="440" height="282" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/39/Technical_drawing%2C_1891.jpg/660px-Technical_drawing%2C_1891.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/39/Technical_drawing%2C_1891.jpg/880px-Technical_drawing%2C_1891.jpg 2x" data-file-width="1237" data-file-height="794" /></a></span> </p> <div class="mw-heading mw-heading2"><h2 id="Common_features">Common features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=5" title="Edit section: Common features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Drawings convey the following critical information: </p> <ul><li><i>Geometry</i> – the shape of the object; represented as views; how the object will look when it is viewed from various angles, such as front, top, side, etc.</li> <li><i>Dimensions</i> – the size of the object is captured in accepted units.</li> <li><i><a href="/wiki/Tolerance_(engineering)" class="mw-redirect" title="Tolerance (engineering)">Tolerances</a></i> – the allowable variations for each dimension.</li> <li><i>Material</i> – represents what the item is made of.</li> <li><i>Finish</i> – specifies the surface quality of the item, functional or cosmetic. For example, a mass-marketed product usually requires a much higher surface quality than, say, a component that goes inside industrial machinery.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Line_styles_and_types">Line styles and types</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=6" title="Edit section: Line styles and types"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Line_types.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/06/Line_types.svg/210px-Line_types.svg.png" decoding="async" width="210" height="202" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/06/Line_types.svg/315px-Line_types.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/06/Line_types.svg/420px-Line_types.svg.png 2x" data-file-width="447" data-file-height="429" /></a><figcaption>Standard engineering drawing line types</figcaption></figure> <p>A variety of line styles graphically represent physical objects. Types of <i>lines</i> include the following: </p> <ul><li><i>visible</i> – are continuous lines used to depict edges directly visible from a particular angle.</li> <li><i>hidden</i> – are short-dashed lines that may be used to represent edges that are not directly visible.</li> <li><i>center</i> – are alternately long- and short-dashed lines that may be used to represent the axes of circular features.</li> <li><i>cutting plane</i> – are thin, medium-dashed lines, or thick alternately long- and double short-dashed that may be used to define sections for <a href="/wiki/Cross_section_(geometry)" title="Cross section (geometry)">section views</a>.</li> <li><i>section</i> – are thin lines in a pattern (pattern determined by the material being "cut" or "sectioned") used to indicate surfaces in section views resulting from "cutting". Section lines are commonly referred to as "cross-hatching".</li> <li><i>phantom</i> – (not shown) are alternately long- and double short-dashed thin lines used to represent a feature or component that is not part of the specified part or assembly. E.g. billet ends that may be used for testing, or the machined product that is the focus of a tooling drawing.</li></ul> <p>Lines can also be classified by a letter classification in which each line is given a letter. </p> <ul><li><b>Type A</b> lines show the outline of the feature of an object. They are the thickest lines on a drawing and done with a pencil softer than HB.</li> <li><b>Type B</b> lines are dimension lines and are used for dimensioning, projecting, extending, or leaders. A harder pencil should be used, such as a 2H pencil.</li> <li><b>Type C</b> lines are used for breaks when the whole object is not shown. These are freehand drawn and only for short breaks. 2H pencil</li> <li><b>Type D</b> lines are similar to Type C, except these are zigzagged and only for longer breaks. 2H pencil</li> <li><b>Type E</b> lines indicate hidden outlines of internal features of an object. These are dotted lines. 2H pencil</li> <li><b>Type F</b> lines are Type E lines, except these are used for drawings in electrotechnology. 2H pencil</li> <li><b>Type G</b> lines are used for centre lines. These are dotted lines, but a long line of 10–20 mm, then a 1 mm gap, then a small line of 2 mm. 2H pencil</li> <li><b>Type H</b> lines are the same as type G, except that every second long line is thicker. These indicate the cutting plane of an object. 2H pencil</li> <li><b>Type K</b> lines indicate the alternate positions of an object and the line taken by that object. These are drawn with a long line of 10–20 mm, then a small gap, then a small line of 2 mm, then a gap, then another small line. 2H pencil.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Multiple_views_and_projections">Multiple views and projections</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=7" title="Edit section: Multiple views and projections"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Graphical_projection" class="mw-redirect" title="Graphical projection">Graphical projection</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:First_angle_projection.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/First_angle_projection.svg/220px-First_angle_projection.svg.png" decoding="async" width="220" height="176" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/First_angle_projection.svg/330px-First_angle_projection.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/First_angle_projection.svg/440px-First_angle_projection.svg.png 2x" data-file-width="700" data-file-height="560" /></a><figcaption>Image of a part represented in <i>first-angle projection</i></figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Conventions_of_placing_vues_in_technical_drawings.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Conventions_of_placing_vues_in_technical_drawings.svg/220px-Conventions_of_placing_vues_in_technical_drawings.svg.png" decoding="async" width="220" height="53" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Conventions_of_placing_vues_in_technical_drawings.svg/330px-Conventions_of_placing_vues_in_technical_drawings.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Conventions_of_placing_vues_in_technical_drawings.svg/440px-Conventions_of_placing_vues_in_technical_drawings.svg.png 2x" data-file-width="462" data-file-height="112" /></a><figcaption>Symbols used to define whether a projection is either <i>first-angle</i> (left) or <i>third-angle</i> (right).</figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Graphical_projection_comparison.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Graphical_projection_comparison.png/220px-Graphical_projection_comparison.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/41/Graphical_projection_comparison.png/330px-Graphical_projection_comparison.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/41/Graphical_projection_comparison.png/440px-Graphical_projection_comparison.png 2x" data-file-width="4550" data-file-height="4550" /></a><figcaption>Several types of graphical projection compared</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Various_projections_of_cube_above_plane.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Various_projections_of_cube_above_plane.svg/220px-Various_projections_of_cube_above_plane.svg.png" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Various_projections_of_cube_above_plane.svg/330px-Various_projections_of_cube_above_plane.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Various_projections_of_cube_above_plane.svg/440px-Various_projections_of_cube_above_plane.svg.png 2x" data-file-width="640" data-file-height="480" /></a><figcaption>Various projections and how they are produced</figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Engineering_drawing_isometric.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/39/Engineering_drawing_isometric.svg/220px-Engineering_drawing_isometric.svg.png" decoding="async" width="220" height="153" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/39/Engineering_drawing_isometric.svg/330px-Engineering_drawing_isometric.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/39/Engineering_drawing_isometric.svg/440px-Engineering_drawing_isometric.svg.png 2x" data-file-width="274" data-file-height="190" /></a><figcaption>Isometric view of the object shown in the engineering drawing <a href="#Example">below</a>.</figcaption></figure> <p>In most cases, a single view is not sufficient to show all necessary features, and several views are used. Types of <i>views</i> include the following: </p> <div class="mw-heading mw-heading4"><h4 id="Multiview_projection">Multiview projection</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=8" title="Edit section: Multiview projection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <i><a href="/wiki/Multiview_projection" class="mw-redirect" title="Multiview projection">multiview projection</a></i> is a type of <a href="/wiki/Orthographic_projection" title="Orthographic projection">orthographic projection</a> that shows the object as it looks from the front, right, left, top, bottom, or back (e.g. the <i>primary views</i>), and is typically positioned relative to each other according to the rules of either <a href="/wiki/Multiview_projection" class="mw-redirect" title="Multiview projection">first-angle or third-angle projection</a>. The origin and vector direction of the projectors (also called projection lines) differs, as explained below. </p> <ul><li>In <i>first-angle projection</i>, the parallel projectors originate as if radiated <i>from behind the viewer</i> and pass through the 3D object to project a 2D image onto the orthogonal plane <i>behind</i> it. The 3D object is projected into 2D "paper" space as if you were looking at a <a href="/wiki/Radiograph" class="mw-redirect" title="Radiograph">radiograph</a> of the object: the top view is under the front view, the right view is at the left of the front view. First-angle projection is the <a href="/wiki/ISO_128" title="ISO 128">ISO standard</a> and is primarily used in Europe.</li> <li>In <i>third-angle projection</i>, the parallel projectors originate as if radiated <i>from the far side of the object</i> and pass through the 3D object to project a 2D image onto the orthogonal plane <i>in front of</i> it. The views of the 3D object are like the panels of a box that envelopes the object, and the panels pivot as they open up flat into the plane of the drawing.<sup id="cite_ref-French_Vierck_1953_pp99-105_6-0" class="reference"><a href="#cite_note-French_Vierck_1953_pp99-105-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Thus the left view is placed on the left and the top view on the top; and the features closest to the front of the 3D object will appear closest to the front view in the drawing. Third-angle projection is primarily used in the United States and Canada, where it is the default projection system according to <a href="/wiki/ASME" class="mw-redirect" title="ASME">ASME</a> standard ASME Y14.3M.</li></ul> <p>Until the late 19th century, first-angle projection was the norm in North America as well as Europe;<sup id="cite_ref-French1918p78_7-0" class="reference"><a href="#cite_note-French1918p78-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-French_Vierck_1953_pp111-114_8-0" class="reference"><a href="#cite_note-French_Vierck_1953_pp111-114-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> but circa the 1890s, third-angle projection spread throughout the North American engineering and manufacturing communities to the point of becoming a widely followed convention,<sup id="cite_ref-French1918p78_7-1" class="reference"><a href="#cite_note-French1918p78-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-French_Vierck_1953_pp111-114_8-1" class="reference"><a href="#cite_note-French_Vierck_1953_pp111-114-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> and it was an ASA standard by the 1950s.<sup id="cite_ref-French_Vierck_1953_pp111-114_8-2" class="reference"><a href="#cite_note-French_Vierck_1953_pp111-114-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Circa World War I, British practice was frequently mixing the use of both projection methods.<sup id="cite_ref-French1918p78_7-2" class="reference"><a href="#cite_note-French1918p78-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>As shown above, the determination of what surface constitutes the front, back, top, and bottom varies depending on the projection method used. </p><p>Not all views are necessarily used.<sup id="cite_ref-French_Vierck_1953_pp97-114_9-0" class="reference"><a href="#cite_note-French_Vierck_1953_pp97-114-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Generally only as many views are used as are necessary to convey all needed information clearly and economically.<sup id="cite_ref-French_Vierck_1953_pp108-111_10-0" class="reference"><a href="#cite_note-French_Vierck_1953_pp108-111-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> The front, top, and right-side views are commonly considered the core group of views included by default,<sup id="cite_ref-French_Vierck_1953_p102_11-0" class="reference"><a href="#cite_note-French_Vierck_1953_p102-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> but any combination of views may be used depending on the needs of the particular design. In addition to the six principal views (front, back, top, bottom, right side, left side), any auxiliary views or sections may be included as serve the purposes of part definition and its communication. View lines or section lines (lines with arrows marked "A-A", "B-B", etc.) define the direction and location of viewing or sectioning. Sometimes a note tells the reader in which zone(s) of the drawing to find the view or section. </p> <div class="mw-heading mw-heading4"><h4 id="Auxiliary_views">Auxiliary views</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=9" title="Edit section: Auxiliary views"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An <i>auxiliary view</i> is an orthographic view that is projected into any plane other than one of the six <i>primary views</i>.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> These views are typically used when an object contains some sort of inclined plane. Using the auxiliary view allows for that inclined plane (and any other significant features) to be projected in their true size and shape. The true size and shape of any feature in an engineering drawing can only be known when the Line of Sight (LOS) is perpendicular to the plane being referenced. It is shown like a three-dimensional object. Auxiliary views tend to make use of <a href="/wiki/Axonometric_projection" title="Axonometric projection">axonometric projection</a>. When existing all by themselves, auxiliary views are sometimes known as <i>pictorials</i>. </p> <div class="mw-heading mw-heading4"><h4 id="Isometric_projection">Isometric projection</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=10" title="Edit section: Isometric projection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An <a href="/wiki/Isometric_projection" title="Isometric projection">isometric projection</a> shows the object from angles in which the scales along each axis of the object are equal. Isometric projection corresponds to rotation of the object by ± 45° about the vertical axis, followed by rotation of approximately ± 35.264° [= arcsin(tan(30°))] about the horizontal axis starting from an orthographic projection view. "Isometric" comes from the Greek for "same measure". One of the things that makes isometric drawings so attractive is the ease with which 60° angles can be constructed with only a <a href="/wiki/Compass-and-straightedge_construction" class="mw-redirect" title="Compass-and-straightedge construction">compass and straightedge</a>. </p><p>Isometric projection is a type of <a href="/wiki/Axonometric_projection" title="Axonometric projection">axonometric projection</a>. The other two types of axonometric projection are: </p> <ul><li><a href="/wiki/Dimetric_projection" class="mw-redirect" title="Dimetric projection">Dimetric projection</a></li> <li><a href="/wiki/Trimetric_projection" class="mw-redirect" title="Trimetric projection">Trimetric projection</a></li></ul> <div class="mw-heading mw-heading4"><h4 id="Oblique_projection">Oblique projection</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=11" title="Edit section: Oblique projection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An <a href="/wiki/Oblique_projection" title="Oblique projection">oblique projection</a> is a simple type of graphical projection used for producing pictorial, two-dimensional <a href="/wiki/Image" title="Image">images</a> of three-dimensional objects: </p> <ul><li>it projects an image by intersecting parallel rays (projectors)</li> <li>from the three-dimensional source object with the drawing surface (projection plan).</li></ul> <p>In both oblique projection and orthographic projection, parallel lines of the source object produce parallel lines in the projected image. </p> <div class="mw-heading mw-heading4"><h4 id="Perspective_projection">Perspective projection</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=12" title="Edit section: Perspective projection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Perspective_(graphical)" title="Perspective (graphical)">Perspective</a> is an approximate representation on a flat surface, of an image as it is perceived by the eye. The two most characteristic features of perspective are that objects are drawn: </p> <ul><li>Smaller as their distance from the observer increases</li> <li>Foreshortened: the size of an object's dimensions along the line of sight are relatively shorter than dimensions across the line of sight.</li></ul> <div class="mw-heading mw-heading4"><h4 id="Section_Views">Section Views</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=13" title="Edit section: Section Views"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Projected views (either Auxiliary or Multi view) which show a cross section of the source object along the specified cut plane. These views are commonly used to show internal features with more clarity than regular projections or hidden lines, it also helps reducing number of hidden lines.In assembly drawings, hardware components (e.g. nuts, screws, washers) are typically not sectioned. Section view is a half side view of object. </p> <div class="mw-heading mw-heading3"><h3 id="Scale">Scale</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=14" title="Edit section: Scale"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/Architect%27s_scale" class="mw-redirect" title="Architect's scale">Architect's scale</a>, <a href="/wiki/Engineer%27s_scale" class="mw-redirect" title="Engineer's scale">Engineer's scale</a>, and <a href="/wiki/Metric_scale" class="mw-redirect" title="Metric scale">Metric scale</a></div> <p>Plans are usually "scale drawings", meaning that the plans are drawn at specific <a href="/wiki/Ratio" title="Ratio">ratio</a> relative to the actual size of the place or object. Various scales may be used for different drawings in a set. For example, a floor plan may be drawn at 1:50 (1:48 or <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac"><span class="num">1</span>⁄<span class="den">4</span></span>″ = 1′ 0″) whereas a detailed view may be drawn at 1:25 (1:24 or <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1154941027"><span class="frac"><span class="num">1</span>⁄<span class="den">2</span></span>″ = 1′ 0″). Site plans are often drawn at 1:200 or 1:100. </p><p>Scale is a nuanced subject in the use of engineering drawings. On one hand, it is a general principle of engineering drawings that they are projected using standardized, mathematically certain projection methods and rules. Thus, great effort is put into having an engineering drawing accurately depict size, shape, form, <a href="/wiki/Aspect_ratio" title="Aspect ratio">aspect ratios</a> between features, and so on. And yet, on the other hand, there is another general principle of engineering drawing that nearly diametrically opposes all this effort and intent—that is, the principle that <i>users are not to scale the drawing to infer a dimension not labeled.</i> This stern admonition is often repeated on drawings, via a boilerplate note in the title block telling the user, "DO NOT SCALE DRAWING." </p><p>The explanation for why these two nearly opposite principles can coexist is as follows. The first principle—that drawings will be made so carefully and accurately—serves the prime goal of why engineering drawing even exists, which is successfully communicating part definition and acceptance criteria—including "what the part should look like if you've made it correctly." The service of this goal is what creates a drawing that one even <i>could</i> scale and get an accurate dimension thereby. And thus the great temptation to do so, when a dimension is wanted but was not labeled. The second principle—that even though scaling the drawing <i>will</i> usually work, one should nevertheless <i>never</i> do it—serves several goals, such as enforcing total clarity regarding who has authority to discern design intent, and preventing erroneous scaling of a drawing that was never drawn to scale to begin with (which is typically labeled "drawing not to scale" or "scale: NTS"). When a user is forbidden from scaling the drawing, they must turn instead to the engineer (for the answers that the scaling would seek), and they will never erroneously scale something that is inherently unable to be accurately scaled. </p><p>But in some ways, the advent of the <a href="/wiki/Computer-aided_design" title="Computer-aided design">CAD</a> and <a href="/wiki/Model-based_definition" title="Model-based definition">MBD</a> era challenges these assumptions that were formed many decades ago. When part definition is defined mathematically via a solid model, the assertion that one cannot interrogate the model—the direct analog of "scaling the drawing"—becomes ridiculous; because when part definition is defined this way, it is not <i>possible</i> for a drawing or model to be "not to scale". A 2D pencil drawing can be inaccurately foreshortened and skewed (and thus not to scale), yet still be a completely valid part definition as long as the labeled dimensions are the only dimensions used, and no scaling of the drawing by the user occurs. This is because what the drawing and labels convey is in reality a <i>symbol</i> of what is wanted, rather than a true <i>replica</i> of it. (For example, a sketch of a hole that is clearly not round still accurately defines the part as having a true round hole, as long as the label says "10mm DIA", because the "DIA" implicitly but objectively tells the user that the skewed drawn circle is a symbol <i>representing</i> a perfect circle.) But if a mathematical model—essentially, a vector graphic—is declared to be the official definition of the part, then any amount of "scaling the drawing" can make sense; there may still be an error in the model, in the sense that what was <i>intended</i> is not <i>depicted</i> (modeled); but there can be no error of the "not to scale" type—because the mathematical vectors and curves are replicas, not symbols, of the part features. </p><p>Even in dealing with 2D drawings, the manufacturing world has changed since the days when people paid attention to the scale ratio claimed on the print, or counted on its accuracy. In the past, prints were plotted on a plotter to exact scale ratios, and the user could know that a line on the drawing 15 mm long corresponded to a 30 mm part dimension because the drawing said "1:2" in the "scale" box of the title block. Today, in the era of ubiquitous desktop printing, where original drawings or scaled prints are often scanned on a scanner and saved as a PDF file, which is then printed at any percent magnification that the user deems handy (such as "fit to paper size"), users have pretty much given up caring what scale ratio is claimed in the "scale" box of the title block. Which, under the rule of "do not scale drawing", never really did that much for them anyway. </p> <div class="mw-heading mw-heading3"><h3 id="Showing_dimensions">Showing dimensions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=15" title="Edit section: Showing dimensions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The required sizes of features are conveyed through use of <i>dimensions.</i> Distances may be indicated with either of two standardized forms of dimension: linear and ordinate. </p> <ul><li>With <i>linear</i> dimensions, two parallel lines, called "extension lines," spaced at the distance between two features, are shown at each of the features. A line perpendicular to the extension lines, called a "dimension line," with arrows at its endpoints, is shown between, and terminating at, the extension lines. The distance is indicated numerically at the midpoint of the dimension line, either adjacent to it, or in a gap provided for it.</li> <li>With <i>ordinate</i> dimensions, one horizontal and one vertical extension line establish an origin for the entire view. The origin is identified with zeroes placed at the ends of these extension lines. Distances along the x- and y-axes to other features are specified using other extension lines, with the distances indicated numerically at their ends.</li></ul> <p>Sizes of circular features are indicated using either diametral or radial dimensions. Radial dimensions use an "R" followed by the value for the radius; Diametral dimensions use a circle with forward-leaning diagonal line through it, called the <i>diameter symbol</i>, followed by the value for the diameter. A radially-aligned line with arrowhead pointing to the circular feature, called a <i>leader</i>, is used in conjunction with both diametral and radial dimensions. All types of dimensions are typically composed of two parts: the <i>nominal</i> value, which is the "ideal" size of the feature, and the <i>tolerance</i>, which specifies the amount that the value may vary above and below the nominal. </p> <ul><li><a href="/wiki/Geometric_dimensioning_and_tolerancing" title="Geometric dimensioning and tolerancing">Geometric dimensioning and tolerancing</a> is a method of specifying the functional geometry of an object.</li></ul> <div class="mw-heading mw-heading3"><h3 id="Sizes_of_drawings">Sizes of drawings</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=16" title="Edit section: Sizes of drawings"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Paper_size" title="Paper size">Paper size</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:A_size_illustration.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/A_size_illustration.svg/220px-A_size_illustration.svg.png" decoding="async" width="220" height="297" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/A_size_illustration.svg/330px-A_size_illustration.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/A_size_illustration.svg/440px-A_size_illustration.svg.png 2x" data-file-width="3219" data-file-height="4346" /></a><figcaption>ISO paper sizes</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:ANSI_size_illustration.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/ANSI_size_illustration.svg/220px-ANSI_size_illustration.svg.png" decoding="async" width="220" height="273" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/28/ANSI_size_illustration.svg/330px-ANSI_size_illustration.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/28/ANSI_size_illustration.svg/440px-ANSI_size_illustration.svg.png 2x" data-file-width="926" data-file-height="1151" /></a><figcaption>ANSI paper sizes</figcaption></figure> <p>Sizes of drawings typically comply with either of two different standards, <a href="/wiki/ISO_standard" class="mw-redirect" title="ISO standard">ISO</a> (World Standard) or <a href="/wiki/ANSI/ASME_Y14.1" title="ANSI/ASME Y14.1">ANSI/ASME Y14.1</a> (American). </p><p>The metric drawing sizes correspond to international <a href="/wiki/Paper_size" title="Paper size">paper sizes</a>. These developed further refinements in the second half of the twentieth century, when <a href="/wiki/Photocopying" class="mw-redirect" title="Photocopying">photocopying</a> became cheap. Engineering drawings could be readily doubled (or halved) in size and put on the next larger (or, respectively, smaller) size of paper with no waste of space. And the metric <a href="/wiki/Technical_pen" title="Technical pen">technical pens</a> were chosen in sizes so that one could add detail or drafting changes with a pen width changing by approximately a factor of the <a href="/wiki/Square_root_of_2" title="Square root of 2">square root of 2</a>. A full set of pens would have the following nib sizes: 0.13, 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.5, and 2.0 mm. However, the International Organization for Standardization (ISO) called for four pen widths and set a colour code for each: 0.25 (white), 0.35 (yellow), 0.5 (brown), 0.7 (blue); these nibs produced lines that related to various text character heights and the ISO paper sizes. </p><p>All ISO paper sizes have the same aspect ratio, one to the square root of 2, meaning that a document designed for any given size can be enlarged or reduced to any other size and will fit perfectly. Given this ease of changing sizes, it is of course common to copy or print a given document on different sizes of paper, especially within a series, e.g. a drawing on A3 may be enlarged to A2 or reduced to A4. </p><p>The US customary "A-size" corresponds to "letter" size, and "B-size" corresponds to "ledger" or "tabloid" size. There were also once British paper sizes, which went by names rather than alphanumeric designations. </p><p><a href="/wiki/American_Society_of_Mechanical_Engineers" title="American Society of Mechanical Engineers">American Society of Mechanical Engineers</a> (ASME) <a href="/wiki/ANSI/ASME_Y14.1" title="ANSI/ASME Y14.1">ANSI/ASME Y14.1</a>, Y14.2, Y14.3, and Y14.5 are commonly referenced standards in the US. </p> <div class="mw-heading mw-heading3"><h3 id="Technical_lettering">Technical lettering</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=17" title="Edit section: Technical lettering"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Technical_lettering" title="Technical lettering">Technical lettering</a> is the process of forming letters, numerals, and other <a href="/wiki/Character_(computing)" title="Character (computing)">characters</a> in technical drawing. It is used to describe, or provide detailed specifications for an object. With the goals of <a href="/wiki/Legibility" title="Legibility">legibility</a> and uniformity, styles are standardized and lettering ability has little relationship to normal writing ability. Engineering drawings use a <a href="/wiki/Sans-serif" title="Sans-serif">Gothic sans-serif</a> script, formed by a series of short strokes. Lower case letters are rare in most drawings of <a href="/wiki/Machine" title="Machine">machines</a>. ISO Lettering templates, designed for use with technical pens and pencils, and to suit ISO paper sizes, produce lettering characters to an international standard. The stroke thickness is related to the character height (for example, 2.5 mm high characters would have a stroke thickness - pen nib size - of 0.25 mm, 3.5 would use a 0.35 mm pen and so forth). The ISO character set (font) has a seriffed one, a barred seven, an <a href="/wiki/Open_four" class="mw-redirect" title="Open four">open four</a>, six, and nine, and a round topped three, that improves legibility when, for example, an A0 drawing has been reduced to A1 or even A3 (and perhaps enlarged back or reproduced/faxed/ microfilmed &c). When CAD drawings became more popular, especially using US software, such as AutoCAD, the nearest font to this ISO standard font was Romantic Simplex (RomanS) - a proprietary shx font) with a manually adjusted width factor (override) to make it look as near to the ISO lettering for the drawing board. However, with the closed four, and arced six and nine, romans.shx typeface could be difficult to read in reductions. In more recent revisions of software packages, the <a href="/wiki/TrueType" title="TrueType">TrueType</a> font ISOCPEUR reliably reproduces the original drawing board lettering stencil style, however, many drawings have switched to the ubiquitous Arial.ttf. </p> <div class="mw-heading mw-heading2"><h2 id="Conventional_parts_(areas)"><span id="Conventional_parts_.28areas.29"></span>Conventional parts (areas)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=18" title="Edit section: Conventional parts (areas)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Title_block">Title block</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=19" title="Edit section: Title block"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Every engineering drawing must have a title block.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>The title block (T/B, TB) is an area of the drawing that conveys <a href="/wiki/Header_(computing)" title="Header (computing)">header</a>-type information about the drawing, such as: </p> <ul><li>Drawing title (hence the name "title block")</li> <li>Drawing number</li> <li><a href="/wiki/Part_number" title="Part number">Part number</a>(s)</li> <li>Name of the design activity (corporation, government agency, etc.)</li> <li>Identifying code of the design activity (such as a <a href="/wiki/Commercial_and_Government_Entity" class="mw-redirect" title="Commercial and Government Entity">CAGE code</a>)</li> <li>Address of the design activity (such as city, state/province, country)</li> <li>Measurement units of the drawing (for example, inches, millimeters)</li> <li>Default tolerances for dimension callouts where no tolerance is specified</li> <li>Boilerplate callouts of general <a href="/wiki/Specification_(technical_standard)" title="Specification (technical standard)">specs</a></li> <li><a href="/wiki/Intellectual_property" title="Intellectual property">Intellectual property</a> rights warning</li></ul> <p><a href="/wiki/ISO_7200" title="ISO 7200">ISO 7200</a> specifies the data fields used in title blocks. It standardizes eight mandatory data fields:<sup id="cite_ref-fg_title_block_16-0" class="reference"><a href="#cite_note-fg_title_block-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Title (hence the name "title block")</li> <li>Created by (name of drafter)</li> <li>Approved by</li> <li>Legal owner (name of company or organization)</li> <li>Document type</li> <li>Drawing number (same for every sheet of this document, unique for each technical document of the organization)</li> <li>Sheet number and number of sheets (for example, "Sheet 5/7")</li> <li>Date of issue (when the drawing was made)</li></ul> <p>Traditional locations for the title block are the bottom right (most commonly) or the top right or center. </p> <div class="mw-heading mw-heading3"><h3 id="Revisions_block">Revisions block</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=20" title="Edit section: Revisions block"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The revisions block (rev block) is a tabulated list of the revisions (versions) of the drawing, documenting the <a href="/wiki/Revision_control" class="mw-redirect" title="Revision control">revision control</a>. </p><p>Traditional locations for the revisions block are the top right (most commonly) or adjoining the title block in some way. </p> <div class="mw-heading mw-heading3"><h3 id="Next_assembly">Next assembly</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=21" title="Edit section: Next assembly"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The next assembly block, often also referred to as "where used" or sometimes "effectivity block", is a list of higher assemblies where the product on the current drawing is used. This block is commonly found adjacent to the title block. </p> <div class="mw-heading mw-heading3"><h3 id="Notes_list">Notes list</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=22" title="Edit section: Notes list"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The notes list provides notes to the user of the drawing, conveying any information that the callouts within the field of the drawing did not. It may include general notes, flagnotes, or a mixture of both. </p><p>Traditional locations for the notes list are anywhere along the edges of the field of the drawing. </p> <div class="mw-heading mw-heading4"><h4 id="General_notes">General notes</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=23" title="Edit section: General notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>General notes (G/N, GN) apply generally to the contents of the drawing, as opposed to applying only to certain part numbers or certain surfaces or features. </p> <div class="mw-heading mw-heading4"><h4 id="Flagnotes">Flagnotes</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=24" title="Edit section: Flagnotes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Flagnotes or flag notes (FL, F/N) are notes that apply only where a flagged callout points, such as to particular surfaces, features, or part numbers. Typically the callout includes a flag icon. Some companies call such notes "delta notes", and the note number is enclosed inside a triangular symbol (similar to <a href="/wiki/Delta_(letter)" title="Delta (letter)">capital letter delta</a>, Δ). "FL5" (flagnote 5) and "D5" (delta note 5) are typical ways to abbreviate in <a href="/wiki/ASCII" title="ASCII">ASCII</a>-only contexts. </p> <div class="mw-heading mw-heading3"><h3 id="Field_of_the_drawing">Field of the drawing</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=25" title="Edit section: Field of the drawing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The field of the drawing (F/D, FD) is the main body or main area of the drawing, excluding the title block, rev block, P/L and so on </p> <div class="mw-heading mw-heading3"><h3 id="List_of_materials,_bill_of_materials,_parts_list"><span id="List_of_materials.2C_bill_of_materials.2C_parts_list"></span>List of materials, bill of materials, parts list</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=26" title="Edit section: List of materials, bill of materials, parts list"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Bill_of_materials" title="Bill of materials">bill of materials</a></div> <p>The list of materials (L/M, LM, LoM), bill of materials (B/M, BM, BoM), or parts list (P/L, PL) is a (usually tabular) list of the materials used to make a part, and/or the parts used to make an assembly. It may contain instructions for heat treatment, finishing, and other processes, for each part number. Sometimes such LoMs or PLs are separate documents from the drawing itself. </p><p>Traditional locations for the LoM/BoM are above the title block, or in a separate document. </p> <div class="mw-heading mw-heading3"><h3 id="Parameter_tabulations">Parameter tabulations</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=27" title="Edit section: Parameter tabulations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some drawings call out dimensions with parameter names (that is, variables, such a "A", "B", "C"), then tabulate rows of parameter values for each part number. </p><p>Traditional locations for parameter tables, when such tables are used, are floating near the edges of the field of the drawing, either near the title block or elsewhere along the edges of the field. </p> <div class="mw-heading mw-heading3"><h3 id="Views_and_sections">Views and sections</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=28" title="Edit section: Views and sections"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Each view or section is a separate set of projections, occupying a contiguous portion of the field of the drawing. Usually views and sections are called out with cross-references to specific zones of the field. </p> <div class="mw-heading mw-heading3"><h3 id="Zones">Zones</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=29" title="Edit section: Zones"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Often a drawing is divided into zones by an <a href="/wiki/Alphanumeric_grid" title="Alphanumeric grid">alphanumeric grid</a>, with zone labels along the margins, such as A, B, C, D up the sides and 1,2,3,4,5,6 along the top and bottom.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> Names of zones are thus, for example, A5, D2, or B1. This feature greatly eases discussion of, and reference to, particular areas of the drawing. </p> <div class="mw-heading mw-heading2"><h2 id="Abbreviations_and_symbols">Abbreviations and symbols</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=30" title="Edit section: Abbreviations and symbols"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Engineering_drawing_abbreviations_and_symbols" title="Engineering drawing abbreviations and symbols">Engineering drawing abbreviations and symbols</a></div> <p>As in many technical fields, a wide array of abbreviations and symbols have been developed in engineering drawing during the 20th and 21st centuries. For example, <a href="/wiki/Cold_rolled_steel" class="mw-redirect" title="Cold rolled steel">cold rolled steel</a> is often abbreviated as CRS, and <a href="/wiki/Diameter" title="Diameter">diameter</a> is often abbreviated as <a href="/wiki/Engineering_drawing_abbreviations_and_symbols" title="Engineering drawing abbreviations and symbols">DIA, D, or ⌀</a>. </p><p>Most engineering drawings are language-independent—words are confined to the title block; symbols are used in place of words elsewhere.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p><p>With the advent of computer generated drawings for manufacturing and machining, many symbols have fallen out of common use. This poses a problem when attempting to interpret an older hand-drawn document that contains obscure elements that cannot be readily referenced in standard teaching text or control documents such as ASME and ANSI standards. For example, ASME Y14.5M 1994 excludes a few elements that convey critical information as contained in older US Navy drawings and aircraft manufacturing drawings of World War 2 vintage. Researching the intent and meaning of some symbols can prove difficult. </p> <div class="mw-heading mw-heading2"><h2 id="Example">Example</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=31" title="Edit section: Example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:Mech_draw_1.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Mech_draw_1.svg/200px-Mech_draw_1.svg.png" decoding="async" width="200" height="184" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/Mech_draw_1.svg/300px-Mech_draw_1.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/Mech_draw_1.svg/400px-Mech_draw_1.svg.png 2x" data-file-width="951" data-file-height="876" /></a><figcaption>Example mechanical drawing</figcaption></figure> <p>Here is an example of an engineering drawing (an isometric view of the same object is shown above). The different line types are colored for clarity. </p> <ul><li>Black = object line and hatching</li> <li>Red = hidden line</li> <li>Blue = center line of piece or opening</li> <li>Magenta = phantom line or cutting plane line</li></ul> <p>Sectional views are indicated by the direction of arrows, as in the example right side. </p> <div class="mw-heading mw-heading2"><h2 id="Legal_instruments">Legal instruments</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=32" title="Edit section: Legal instruments"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>An engineering drawing is a legal document (that is, a <a href="/wiki/Legal_instrument" title="Legal instrument">legal instrument</a>), because it communicates all the needed information about "what is wanted" to the people who will expend resources turning the idea into a reality. It is thus a part of a <a href="/wiki/Contract" title="Contract">contract</a>; the <a href="/wiki/Purchase_order" title="Purchase order">purchase order</a> and the drawing together, as well as any ancillary documents (engineering change orders [ECOs], called-out <a href="/wiki/Specification_(technical_standard)" title="Specification (technical standard)">specs</a>), constitute the contract. Thus, if the resulting product is wrong, the worker or manufacturer are protected from <a href="/wiki/Legal_liability" title="Legal liability">liability</a> as long as they have faithfully executed the instructions conveyed by the drawing. If those instructions were wrong, it is the fault of the engineer. Because manufacturing and construction are typically very expensive processes (involving large amounts of <a href="/wiki/Capital_(economics)" title="Capital (economics)">capital</a> and <a href="/wiki/Payroll" title="Payroll">payroll</a>), the question of liability for errors has <a href="/wiki/Legal" class="mw-redirect" title="Legal">legal</a> implications. </p> <div class="mw-heading mw-heading2"><h2 id="Relationship_to_model-based_definition_(MBD/DPD)"><span id="Relationship_to_model-based_definition_.28MBD.2FDPD.29"></span>Relationship to model-based definition (MBD/DPD)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=33" title="Edit section: Relationship to model-based definition (MBD/DPD)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>For centuries, engineering drawing was the sole method of transferring information from design into manufacture. In recent decades another method has arisen, called <a href="/wiki/Model-based_definition" title="Model-based definition">model-based definition</a> (MBD) or digital product definition (DPD). In MBD, the information captured by the CAD software app is fed automatically into a CAM app (<a href="/wiki/Computer-aided_manufacturing" title="Computer-aided manufacturing">computer-aided manufacturing</a>), which (with or without postprocessing apps) creates code in other languages such as <a href="/wiki/G-code" title="G-code">G-code</a> to be executed by a CNC machine tool (<a href="/wiki/Numerical_control" title="Numerical control">computer numerical control</a>), <a href="/wiki/3D_printing" title="3D printing">3D printer</a>, or (increasingly) a hybrid machine tool that uses both. Thus today it is often the case that the information travels from the mind of the designer into the manufactured component without having ever been codified by an engineering drawing. In MBD, the <a href="/wiki/Data_set" title="Data set">dataset</a>, not a drawing, is the legal instrument. The term "technical data package" (TDP) is now used to refer to the <i>complete package of information</i> (in one medium or another) that communicates information from design to production (such as 3D-model datasets, engineering drawings, engineering change orders (ECOs), <a href="/wiki/Specification_(technical_standard)" title="Specification (technical standard)">spec</a> revisions and addenda, and so on). </p><p>It still takes CAD/CAM programmers, CNC setup workers, and CNC operators to do manufacturing, as well as other people such as quality assurance staff (inspectors) and logistics staff (for materials handling, shipping-and-receiving, and <a href="/wiki/Front_office" title="Front office">front office</a> functions). These workers often use drawings in the course of their work that have been produced from the MBD dataset. When proper procedures are being followed, a clear chain of precedence is always documented, such that when a person looks at a drawing, they are told by a note thereon that this drawing is not the governing instrument (because the MBD dataset is). In these cases, the drawing is still a useful document, although legally it is classified as "for reference only", meaning that if any controversies or discrepancies arise, it is the MBD dataset, not the drawing, that governs. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=34" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Architectural_drawing" title="Architectural drawing">Architectural drawing</a></li> <li><a href="/wiki/ASME" class="mw-redirect" title="ASME">ASME</a> AED-1 Aerospace and Advanced Engineering Drawings <sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li> <li><a href="/wiki/B._Hick_and_Sons#Engineering_drawings" title="B. Hick and Sons">B. Hick and Sons</a> – Notable collection of early locomotive and steam engine drawings</li> <li><a href="/wiki/CAD_standards" title="CAD standards">CAD standards</a></li> <li><a href="/wiki/Descriptive_geometry" title="Descriptive geometry">Descriptive geometry</a></li> <li><a href="/wiki/Document_management_system" title="Document management system">Document management system</a></li> <li><a href="/wiki/Engineering_drawing_symbols" class="mw-redirect" title="Engineering drawing symbols">Engineering drawing symbols</a></li> <li><a href="/wiki/Geometric_tolerance" class="mw-redirect" title="Geometric tolerance">Geometric tolerance</a></li> <li><a href="/wiki/ISO_128" title="ISO 128">ISO 128</a> Technical drawings – General principles of presentation</li> <li><a href="/wiki/Light_plot" title="Light plot">light plot</a></li> <li><a href="/wiki/Linear_scale" title="Linear scale">Linear scale</a></li> <li><a href="/wiki/Patent_drawing" title="Patent drawing">Patent drawing</a></li> <li>Scale rulers: <a href="/wiki/Architect%27s_scale" class="mw-redirect" title="Architect's scale">architect's scale</a> and <a href="/wiki/Engineer%27s_scale" class="mw-redirect" title="Engineer's scale">engineer's scale</a></li> <li><a href="/wiki/Specification_(technical_standard)" title="Specification (technical standard)">Specification (technical standard)</a></li> <li><a href="/wiki/Structural_drawing" title="Structural drawing">Structural drawing</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=35" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-:0-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFM._Maitra2000" class="citation book cs1">M. 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Retrieved <span class="nowrap">2024-11-16</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Engineering+Design&rft.atitle=Principles+of+Dimensioning&rft_id=https%3A%2F%2Fwww.mcgill.ca%2Fengineeringdesign%2Fstep-step-design-process%2Fbasics-graphics-communication%2Fprinciples-dimensioning&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEngineering+drawing" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKlopotic" class="citation web cs1">Klopotic, Cory. <a rel="nofollow" class="external text" href="https://www.mcl.bz/blog/3-reasons-accurate-engineering-drawings-are-critical-to-the-manufacturing-process">"3 Reasons Accurate Engineering Drawings Are Critical to the Manufacturing Process"</a>. <i>www.mcl.bz</i><span class="reference-accessdate">. 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Embuido. <a rel="nofollow" class="external text" href="https://books.google.com/books?id=t-KtEyjmgBQC">"Engineering Aid 1 & C"</a>. 1988. p. 7-10.</span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=unwwAAAAYAAJ">"Farm Planners' Engineering Handbook for the Upper Mississippi Region"</a>. 1953. p. 2-5.</span> </li> <li id="cite_note-fg_title_block-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-fg_title_block_16-0">^</a></b></span> <span class="reference-text"> Farhad Ghorani. <a rel="nofollow" class="external text" href="http://tolerancing.net/engineering-drawing/title-block.html">"Title Block"</a>. 2015.</span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"> Paul Munford. <a rel="nofollow" class="external text" href="https://cadsetterout.com/drawing-standards/grid-reference-frame/">"Technical drawing standards: Grid reference frame"</a>.</span> </li> <li id="cite_note-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-18">^</a></b></span> <span class="reference-text"> Brian Griffiths. <a rel="nofollow" class="external text" href="https://books.google.com/books?id=eZkRaV9wyHMC&pg=PA13">"Engineering Drawing for Manufacture"</a>. 2002. p. 1 and p. 13.</span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://www.asme.org/codes-standards/find-codes-standards/aed-1-aerospace-advanced-engineering-drawings/2018/drm-enabled-pdf"><i>ASME AED-1 Aerospace and Advanced Engineering Drawings</i></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ASME+AED-1+Aerospace+and+Advanced+Engineering+Drawings&rft_id=https%3A%2F%2Fwww.asme.org%2Fcodes-standards%2Ffind-codes-standards%2Faed-1-aerospace-advanced-engineering-drawings%2F2018%2Fdrm-enabled-pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEngineering+drawing" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="Bibliography">Bibliography</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=36" title="Edit section: Bibliography"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFrench1918" class="citation cs2">French, Thomas E. (1918), <a rel="nofollow" class="external text" href="https://books.google.com/books?id=6R5DAAAAIAAJ&pg=PR3"><i>A manual of engineering drawing for students and draftsmen</i></a> (2nd ed.), New York, New York, USA: McGraw-Hill, <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/30018430">30018430</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=A+manual+of+engineering+drawing+for+students+and+draftsmen&rft.place=New+York%2C+New+York%2C+USA&rft.edition=2nd&rft.pub=McGraw-Hill&rft.date=1918&rft_id=info%3Alccn%2F30018430&rft.aulast=French&rft.aufirst=Thomas+E.&rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D6R5DAAAAIAAJ%26pg%3DPR3&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEngineering+drawing" class="Z3988"></span> : <a href="/wiki/Engineering_Drawing_(book)" title="Engineering Drawing (book)">Engineering Drawing (book)</a></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFFrenchVierck1953" class="citation cs2">French, Thomas E.; Vierck, Charles J. (1953), <i>A manual of engineering drawing for students and draftsmen</i> (8th ed.), New York, New York, USA: McGraw-Hill, <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/52013455">52013455</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=A+manual+of+engineering+drawing+for+students+and+draftsmen&rft.place=New+York%2C+New+York%2C+USA&rft.edition=8th&rft.pub=McGraw-Hill&rft.date=1953&rft_id=info%3Alccn%2F52013455&rft.aulast=French&rft.aufirst=Thomas+E.&rft.au=Vierck%2C+Charles+J.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEngineering+drawing" class="Z3988"></span> : <a href="/wiki/Engineering_Drawing_(book)" title="Engineering Drawing (book)">Engineering Drawing (book)</a></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRolt1957" class="citation cs2"><a href="/wiki/L._T._C._Rolt" title="L. T. C. Rolt">Rolt, L.T.C.</a> (1957), <i><a href="/wiki/Isambard_Kingdom_Brunel" title="Isambard Kingdom Brunel">Isambard Kingdom Brunel</a>: A Biography</i>, Longmans Green, <a href="/wiki/LCCN_(identifier)" class="mw-redirect" title="LCCN (identifier)">LCCN</a> <a rel="nofollow" class="external text" href="https://lccn.loc.gov/57003475">57003475</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Isambard+Kingdom+Brunel%3A+A+Biography&rft.pub=Longmans+Green&rft.date=1957&rft_id=info%3Alccn%2F57003475&rft.aulast=Rolt&rft.aufirst=L.T.C.&rfr_id=info%3Asid%2Fen.wikipedia.org%3AEngineering+drawing" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=37" title="Edit section: Further reading"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Basant Agrawal and C M Agrawal (2013). <i>Engineering Drawing</i>. Second Edition, McGraw Hill Education India Pvt. Ltd., New Delhi. <a rel="nofollow" class="external autonumber" href="https://books.google.com/books?id=_hdOU8kRb2AC">[1]</a></li> <li>Paige Davis, Karen Renee Juneau (2000). <i>Engineering Drawing</i></li> <li>David A. Madsen, Karen Schertz, (2001) <i>Engineering Drawing & Design</i>. Delmar Thomson Learning. <a rel="nofollow" class="external autonumber" href="https://books.google.com/books?id=N97zPAvogxoC">[2]</a></li> <li>Cecil Howard Jensen, Jay D. Helsel, Donald D. Voisinet <i>Computer-aided engineering drawing using AutoCAD</i>.</li> <li>Warren Jacob Luzadder (1959). <i>Fundamentals of engineering drawing for technical students and professional</i>.</li> <li>M.A. Parker, F. Pickup (1990) <i>Engineering Drawing with Worked Examples</i>.</li> <li>Colin H. Simmons, Dennis E. Maguire <i>Manual of engineering drawing</i>. Elsevier.</li> <li>Cecil Howard Jensen (2001). <i>Interpreting Engineering Drawings</i>.</li> <li>B. Leighton Wellman (1948). <i>Technical Descriptive Geometry</i>. McGraw-Hill Book Company, Inc.</li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Engineering_drawing&action=edit&section=38" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output 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href="/wiki/Crime_mapping" title="Crime mapping">Crime mapping</a></li> <li><a href="/wiki/Data_visualization" class="mw-redirect" title="Data visualization">Data visualization</a></li> <li><a href="/wiki/Visualization_(graphics)" title="Visualization (graphics)">Educational visualization</a></li> <li><a href="/wiki/Flow_visualization" title="Flow visualization">Flow visualization</a></li> <li><a href="/wiki/Geovisualization" title="Geovisualization">Geovisualization</a></li> <li><a href="/wiki/Information_visualization" class="mw-redirect" title="Information visualization">Information visualization</a></li> <li><a href="/wiki/Mathematical_diagram" title="Mathematical diagram">Mathematical visualization</a></li> <li><a href="/wiki/Medical_imaging" title="Medical imaging">Medical imaging</a></li> <li><a href="/wiki/Molecular_graphics" title="Molecular graphics">Molecular graphics</a></li> <li><a href="/wiki/Visualization_(graphics)" title="Visualization (graphics)">Product visualization</a></li> <li><a href="/wiki/Scientific_visualization" title="Scientific visualization">Scientific visualization</a></li> <li><a href="/wiki/Social_visualization" title="Social visualization">Social visualization</a></li> <li><a href="/wiki/Software_visualization" title="Software visualization">Software visualization</a></li> <li><a href="/wiki/Technical_drawing" title="Technical drawing">Technical drawing</a></li> <li><a href="/wiki/User_interface_design" title="User interface design">User interface design</a></li> <li><a href="/wiki/Visual_culture" title="Visual culture">Visual culture</a></li> <li><a href="/wiki/Volume_rendering" title="Volume rendering">Volume visualization</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Image <br />types</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Chart" title="Chart">Chart</a></li> <li><a href="/wiki/Diagram" title="Diagram">Diagram</a></li> <li><a class="mw-selflink selflink">Engineering drawing</a></li> <li><a href="/wiki/Graph_of_a_function" title="Graph of a function">Graph of a function</a></li> <li><a href="/wiki/Ideogram" title="Ideogram">Ideogram</a></li> <li><a href="/wiki/Map" title="Map">Map</a></li> <li><a href="/wiki/Photograph" title="Photograph">Photograph</a></li> <li><a href="/wiki/Pictogram" title="Pictogram">Pictogram</a></li> <li><a href="/wiki/Plot_(graphics)" title="Plot (graphics)">Plot</a></li> <li><a href="/wiki/Sankey_diagram" title="Sankey diagram">Sankey diagram</a></li> <li><a href="/wiki/Schematic" title="Schematic">Schematic</a></li> <li><a href="/wiki/Skeletal_formula" title="Skeletal formula">Skeletal formula</a></li> <li><a href="/wiki/Statistical_graphics" title="Statistical graphics">Statistical graphics</a></li> <li><a href="/wiki/Table_(information)" title="Table (information)">Table</a></li> <li><a href="/wiki/Technical_drawing" title="Technical drawing">Technical drawings</a></li> <li><a href="/wiki/Technical_illustration" title="Technical illustration">Technical illustration</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Pre-19th century</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Edmond_Halley" title="Edmond Halley">Edmond Halley</a></li> <li><a href="/wiki/Charles-Ren%C3%A9_de_Fourcroy" title="Charles-René de Fourcroy">Charles-René de Fourcroy</a></li> <li><a href="/wiki/Joseph_Priestley" title="Joseph Priestley">Joseph Priestley</a></li> <li><a href="/wiki/Gaspard_Monge" title="Gaspard Monge">Gaspard Monge</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">19th century</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Charles_Dupin" title="Charles Dupin">Charles Dupin</a></li> <li><a href="/wiki/Adolphe_Quetelet" title="Adolphe Quetelet">Adolphe Quetelet</a></li> <li><a href="/wiki/Andr%C3%A9-Michel_Guerry" title="André-Michel Guerry">André-Michel Guerry</a></li> <li><a href="/wiki/William_Playfair" title="William Playfair">William Playfair</a></li> <li><a href="/wiki/August_Kekul%C3%A9" title="August Kekulé">August Kekulé</a></li> <li><a href="/wiki/Charles_Joseph_Minard" title="Charles Joseph Minard">Charles Joseph Minard</a></li> <li><a href="/w/index.php?title=Luigi_Perozzo&action=edit&redlink=1" class="new" title="Luigi Perozzo (page does not exist)">Luigi Perozzo</a></li> <li><a href="/wiki/Francis_Amasa_Walker" title="Francis Amasa Walker">Francis Amasa Walker</a></li> <li><a href="/wiki/John_Venn" title="John Venn">John Venn</a></li> <li><a href="/wiki/Oliver_Byrne_(mathematician)" title="Oliver Byrne (mathematician)">Oliver Byrne</a></li> <li><a href="/wiki/Matthew_Henry_Phineas_Riall_Sankey" title="Matthew Henry Phineas Riall Sankey">Matthew Sankey</a></li> <li><a href="/wiki/Charles_Booth_(social_reformer)" title="Charles Booth (social reformer)">Charles Booth</a></li> <li><a href="/w/index.php?title=Georg_von_Mayr&action=edit&redlink=1" class="new" title="Georg von Mayr (page does not exist)">Georg von Mayr</a></li> <li><a href="/wiki/John_Snow" title="John Snow">John Snow</a></li> <li><a href="/wiki/Florence_Nightingale" title="Florence Nightingale">Florence Nightingale</a></li> <li><a href="/wiki/Karl_Wilhelm_Pohlke" title="Karl Wilhelm Pohlke">Karl Wilhelm Pohlke</a></li> <li><a href="/wiki/Toussaint_Loua" title="Toussaint Loua">Toussaint Loua</a></li> <li><a href="/wiki/Francis_Galton" title="Francis Galton">Francis Galton</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Early 20th century</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Edward_Walter_Maunder" title="Edward Walter Maunder">Edward Walter Maunder</a></li> <li><a href="/wiki/Otto_Neurath" title="Otto Neurath">Otto Neurath</a></li> <li><a href="/wiki/W._E._B._Du_Bois" title="W. E. B. Du Bois">W. E. B. Du Bois</a></li> <li><a href="/wiki/Henry_Gantt" title="Henry Gantt">Henry Gantt</a></li> <li><a href="/wiki/Arthur_Lyon_Bowley" title="Arthur Lyon Bowley">Arthur Lyon Bowley</a></li> <li><a href="/wiki/Howard_G._Funkhouser" title="Howard G. Funkhouser">Howard G. Funkhouser</a></li> <li><a href="/wiki/John_B._Peddle" title="John B. Peddle">John B. Peddle</a></li> <li><a href="/wiki/Ejnar_Hertzsprung" title="Ejnar Hertzsprung">Ejnar Hertzsprung</a></li> <li><a href="/wiki/Henry_Norris_Russell" title="Henry Norris Russell">Henry Norris Russell</a></li> <li><a href="/wiki/Max_O._Lorenz" title="Max O. Lorenz">Max O. Lorenz</a></li> <li><a href="/wiki/Fritz_Kahn" title="Fritz Kahn">Fritz Kahn</a></li> <li><a href="/wiki/Harry_Beck" title="Harry Beck">Harry Beck</a></li> <li><a href="/wiki/Erwin_Raisz" title="Erwin Raisz">Erwin Raisz</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Mid 20th century</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Jacques_Bertin" title="Jacques Bertin">Jacques Bertin</a></li> <li><a href="/wiki/Rudolf_Modley" title="Rudolf Modley">Rudolf Modley</a></li> <li><a href="/wiki/Arthur_H._Robinson" title="Arthur H. Robinson">Arthur H. Robinson</a></li> <li><a href="/wiki/John_Tukey" title="John Tukey">John Tukey</a></li> <li><a href="/wiki/Mary_Eleanor_Spear" title="Mary Eleanor Spear">Mary Eleanor Spear</a></li> <li><a href="/wiki/Edgar_Anderson" title="Edgar Anderson">Edgar Anderson</a></li> <li><a href="/wiki/Howard_T._Fisher" title="Howard T. Fisher">Howard T. Fisher</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Late 20th century</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Borden_Dent" title="Borden Dent">Borden Dent</a></li> <li><a href="/wiki/Nigel_Holmes" title="Nigel Holmes">Nigel Holmes</a></li> <li><a href="/wiki/William_S._Cleveland" title="William S. Cleveland">William S. Cleveland</a></li> <li><a href="/wiki/George_G._Robertson" title="George G. Robertson">George G. Robertson</a></li> <li><a href="/wiki/Bruce_H._McCormick" title="Bruce H. McCormick">Bruce H. McCormick</a></li> <li><a href="/wiki/Catherine_Plaisant" title="Catherine Plaisant">Catherine Plaisant</a></li> <li><a href="/wiki/Stuart_Card" title="Stuart Card">Stuart Card</a></li> <li><a href="/wiki/Pat_Hanrahan" title="Pat Hanrahan">Pat Hanrahan</a></li> <li><a href="/wiki/Edward_Tufte" title="Edward Tufte">Edward Tufte</a></li> <li><a href="/wiki/Ben_Shneiderman" title="Ben Shneiderman">Ben Shneiderman</a></li> <li><a href="/wiki/Michael_Friendly" title="Michael Friendly">Michael Friendly</a></li> <li><a href="/wiki/Howard_Wainer" title="Howard Wainer">Howard Wainer</a></li> <li><a href="/wiki/Clifford_A._Pickover" title="Clifford A. Pickover">Clifford A. Pickover</a></li> <li><a href="/wiki/Lawrence_J._Rosenblum" title="Lawrence J. Rosenblum">Lawrence J. Rosenblum</a></li> <li><a href="/wiki/Thomas_A._DeFanti" title="Thomas A. DeFanti">Thomas A. DeFanti</a></li> <li><a href="/wiki/George_Furnas" title="George Furnas">George Furnas</a></li> <li><a href="/wiki/Sheelagh_Carpendale" title="Sheelagh Carpendale">Sheelagh Carpendale</a></li> <li><a href="/wiki/Cynthia_Brewer" title="Cynthia Brewer">Cynthia Brewer</a></li> <li><a href="/wiki/Jock_D._Mackinlay" title="Jock D. Mackinlay">Jock D. Mackinlay</a></li> <li><a href="/wiki/Alan_MacEachren" title="Alan MacEachren">Alan MacEachren</a></li> <li><a href="/wiki/David_Goodsell" title="David Goodsell">David Goodsell</a></li> <li><a href="/wiki/Kwan-Liu_Ma" title="Kwan-Liu Ma">Kwan-Liu Ma</a></li> <li><a href="/wiki/Michael_Maltz" class="mw-redirect" title="Michael Maltz">Michael Maltz</a></li> <li><a href="/wiki/Leland_Wilkinson" title="Leland Wilkinson">Leland Wilkinson</a></li> <li><a href="/wiki/Alfred_Inselberg" title="Alfred Inselberg">Alfred Inselberg</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Early 21st century</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Polo_Chau&action=edit&redlink=1" class="new" title="Polo Chau (page does not exist)">Polo Chau</a></li> <li><a href="/wiki/Ben_Fry" title="Ben Fry">Ben Fry</a></li> <li><a href="/wiki/Jeffrey_Heer" title="Jeffrey Heer">Jeffrey Heer</a></li> <li><a href="/wiki/Jessica_Hullman" title="Jessica Hullman">Jessica Hullman</a></li> <li><a href="/wiki/Gordon_Kindlmann" title="Gordon Kindlmann">Gordon Kindlmann</a></li> <li><a href="/wiki/Aaron_Koblin" title="Aaron Koblin">Aaron Koblin</a></li> <li><a href="/w/index.php?title=Martin_Krzywinski&action=edit&redlink=1" class="new" title="Martin Krzywinski (page does not exist)">Martin Krzywinski</a></li> <li><a href="/wiki/Christopher_R._Johnson" title="Christopher R. Johnson">Christopher R. Johnson</a></li> <li><a href="/wiki/Manuel_Lima" title="Manuel Lima">Manuel Lima</a></li> <li><a href="/wiki/David_McCandless" title="David McCandless">David McCandless</a></li> <li><a href="/wiki/Mauro_Martino" title="Mauro Martino">Mauro Martino</a></li> <li><a href="/wiki/John_Maeda" title="John Maeda">John Maeda</a></li> <li><a href="/wiki/Miriah_Meyer" title="Miriah Meyer">Miriah Meyer</a></li> <li><a href="/wiki/Tamara_Munzner" title="Tamara Munzner">Tamara Munzner</a></li> <li><a href="/wiki/Ade_Olufeko" class="mw-redirect" title="Ade Olufeko">Ade Olufeko</a></li> <li><a href="/wiki/Hanspeter_Pfister" title="Hanspeter Pfister">Hanspeter Pfister</a></li> <li><a href="/wiki/Hans_Rosling" title="Hans Rosling">Hans Rosling</a></li> <li><a href="/wiki/Claudio_Silva_(computer_scientist)" title="Claudio Silva (computer scientist)">Claudio Silva</a></li> <li><a href="/wiki/Moritz_Stefaner" title="Moritz Stefaner">Moritz Stefaner</a></li> <li><a href="/wiki/Fernanda_Vi%C3%A9gas" title="Fernanda Viégas">Fernanda Viégas</a></li> <li><a href="/wiki/Martin_M._Wattenberg" title="Martin M. Wattenberg">Martin Wattenberg</a></li> <li><a href="/wiki/Bang_Wong" title="Bang Wong">Bang Wong</a></li> <li><a href="/wiki/Hadley_Wickham" title="Hadley Wickham">Hadley Wickham</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related <br />topics</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cartography" title="Cartography">Cartography</a></li> <li><a href="/wiki/Chartjunk" title="Chartjunk">Chartjunk</a></li> <li><a href="/wiki/Color_coding_in_data_visualization" class="mw-redirect" title="Color coding in data visualization">Color coding</a></li> <li><a href="/wiki/Computer_graphics" title="Computer graphics">Computer graphics</a> <ul><li><a href="/wiki/Computer_graphics_(computer_science)" title="Computer graphics (computer science)">in computer science</a></li></ul></li> <li><a href="/wiki/CPK_coloring" title="CPK coloring">CPK coloring</a></li> <li><a href="/wiki/Graph_drawing" title="Graph drawing">Graph drawing</a></li> <li><a href="/wiki/Graphic_design" title="Graphic design">Graphic design</a></li> <li><a href="/wiki/Graphic_organizer" title="Graphic organizer">Graphic organizer</a></li> <li><a href="/wiki/Imaging_science" class="mw-redirect" title="Imaging science">Imaging science</a></li> <li><a href="/wiki/Infographic" title="Infographic">Information graphics</a></li> <li><a href="/wiki/Information_science" title="Information science">Information science</a></li> <li><a href="/wiki/Misleading_graph" title="Misleading graph">Misleading graph</a></li> <li><a href="/wiki/Neuroimaging" title="Neuroimaging">Neuroimaging</a></li> <li><a href="/wiki/Patent_drawing" title="Patent drawing">Patent drawing</a></li> <li><a href="/wiki/Scientific_modelling" title="Scientific modelling">Scientific modelling</a></li> <li><a href="/wiki/Spatial_analysis" title="Spatial analysis">Spatial analysis</a></li> <li><a href="/wiki/Visual_analytics" title="Visual analytics">Visual analytics</a></li> <li><a href="/wiki/Visual_perception" title="Visual perception">Visual perception</a></li> <li><a href="/wiki/Volume_cartography" title="Volume cartography">Volume cartography</a></li> <li><a href="/wiki/Volume_rendering" title="Volume rendering">Volume rendering</a></li> <li><a href="/wiki/Information_art" title="Information art">Information art</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q1788588#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" 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