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dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Tool used on a machine to accurately align the head with the work prior to machining</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-Confusing plainlinks metadata ambox ambox-style ambox-confusing" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/40px-Edit-clear.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/60px-Edit-clear.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/f2/Edit-clear.svg/80px-Edit-clear.svg.png 2x" data-file-width="48" data-file-height="48" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>may be <a href="/wiki/Wikipedia:Vagueness" title="Wikipedia:Vagueness">confusing or unclear</a> to readers</b>. In particular, differentiate the types (edge/center) of tool. Define <i>kickoff</i> and <i>collet</i>. Further explain the context and usage of the tool - is it moved across the work or pressed down against it? What does an operator observe or manipulate? How does a collet help accuracy? What constitutes a <i>proper setup</i> or an improper one? Explain why <i>digital</i> is erroneous. Are the repeatabilities dependent on the quality of the tool, operator, both, or neither? How is a center finder different than a school pencil?.<span class="hide-when-compact"> Please help <a href="/wiki/Wikipedia:Please_clarify" title="Wikipedia:Please clarify">clarify the article</a>. There might be a discussion about this on <a href="/wiki/Talk:Wiggler_(tool)" title="Talk:Wiggler (tool)">the talk page</a>.</span> <span class="date-container"><i>(<span class="date">May 2017</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:WrigglerSet.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/WrigglerSet.jpg/220px-WrigglerSet.jpg" decoding="async" width="220" height="210" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/WrigglerSet.jpg/330px-WrigglerSet.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8d/WrigglerSet.jpg/440px-WrigglerSet.jpg 2x" data-file-width="1377" data-file-height="1317" /></a><figcaption>Set of wigglers</figcaption></figure> <p>A <b>wiggler</b>, also known as a <b>wobbler</b>, <b>edge-finder</b>, <b>center-finder</b> or <b>laser-centering-device</b>, is a tool used with a machine like a <a href="/wiki/Milling_machine" class="mw-redirect" title="Milling machine">mill</a>, to accurately align the machine head with the work prior to machining. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Edge_finder">Edge finder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wiggler_(tool)&action=edit&section=1" title="Edit section: Edge finder"><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:Wriggler.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Wriggler.jpg/220px-Wriggler.jpg" decoding="async" width="220" height="89" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Wriggler.jpg/330px-Wriggler.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Wriggler.jpg/440px-Wriggler.jpg 2x" data-file-width="879" data-file-height="354" /></a><figcaption>Edge finder</figcaption></figure> <p>An edge finder is a rotating tool, meaning the machine spindle must be turning for the tool to work. On one end of a cylindrical shank, a second cylinder is attached by a spring running through the center of both cylinders. The second cylinder rotates with the first. The axes of the two cylinders are always parallel, but the mating faces are able to slide against each other. Thus the second cylinder can rotate about a different, but always parallel axis to the first. </p><p>As the second cylinder approaches the edge to be located, it is pushed into alignment with the first. When the horizontal distance from the workpiece to the axis of the shank is exactly equal to the radius of the second cylinder, the second cylinder turns perfectly coaxially with the shank. Even a very small displacement in the direction of the workpiece cause the second cylinder to "kick off" and displace dramatically along the workpiece edge. </p><p>On the other end, a cone shape is also spring-loaded and is used to locate the center of a previously drilled hole. This style of edge finder is considered to be the most accurate, and its accuracy can be further improved through the use of a <a href="/wiki/Collet" title="Collet">collet</a>. In proper setups, a repeatability of 0.0002 in (0.0051 mm) or better can be obtained. </p> <div class="mw-heading mw-heading2"><h2 id="Electronic_edge_finder">Electronic edge finder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wiggler_(tool)&action=edit&section=2" title="Edit section: Electronic edge finder"><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:Electronic_edge_finder.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/0/06/Electronic_edge_finder.jpg/220px-Electronic_edge_finder.jpg" decoding="async" width="220" height="146" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/0/06/Electronic_edge_finder.jpg/330px-Electronic_edge_finder.jpg 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/0/06/Electronic_edge_finder.jpg/440px-Electronic_edge_finder.jpg 2x" data-file-width="1024" data-file-height="681" /></a><figcaption>Electronic edge finder</figcaption></figure> <p>An electronic edge finder, is an instrument that can locate edges of work pieces and also height offsets. It works in a non-rotating spindle, which is a great advantage over its mechanical counterparts. It is battery-operated and works by lighting up its internal <a href="/wiki/LED" class="mw-redirect" title="LED">LED</a> (usually red) when the electrical circuit formed by the instrument, the workpiece and the machine is closed. The light is thus illuminated when the edge finder is touching the workpiece and is visible through openings in the case. A repeatability of 0.001 in (0.025 mm) can be obtained. </p> <div class="mw-heading mw-heading2"><h2 id="Center_finder">Center finder</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wiggler_(tool)&action=edit&section=3" title="Edit section: Center finder"><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:Center_finder.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Center_finder.jpg/170px-Center_finder.jpg" decoding="async" width="170" height="256" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Center_finder.jpg/255px-Center_finder.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Center_finder.jpg/340px-Center_finder.jpg 2x" data-file-width="700" data-file-height="1053" /></a><figcaption>Center finder</figcaption></figure> <p>A center finder is a tool used to align the machining center to a precision location on a work piece. Often these locations might be marked using a layout method (coating the surface with layout stain and scribing a precise location with the intersection of the two lines identifying the position to be machined, etc. Sometimes a magnifying glass is used to assist in marking the location. One drawback of this method is that it is only as accurate as the lines that are drawn on the part.). </p><p>In contrast to the edge finder, in the mechanical versions, the tip is not spring-loaded, and it works with the spindle stopped. In laser versions, an 'X' of light is often projected from the machining center onto the work piece and the work piece location is adjusted to align with the intersection of these lines. In contrast to centering devices, the center finder cannot directly find the center of a work piece, thus requires additional calculation, measurement and/or layout method to align to. </p> <div class="mw-heading mw-heading2"><h2 id="Centering_device">Centering device</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wiggler_(tool)&action=edit&section=4" title="Edit section: Centering device"><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:Laser_Centering_Device.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Laser_Centering_Device.png/220px-Laser_Centering_Device.png" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/Laser_Centering_Device.png/330px-Laser_Centering_Device.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/Laser_Centering_Device.png/440px-Laser_Centering_Device.png 2x" data-file-width="1920" data-file-height="1080" /></a><figcaption>Centering of a shaft with a laser centering device</figcaption></figure> <p>A centering device is a tool used to accurately adjust and align the center plane or axis of a work piece or work piece feature to the machining center. In contrast to the edge finder, it most often requires no calculation, measurements or layout method markings to allow this alignment. Mechanical versions may work with the spindle stopped. Laser centering devices can be used to cast patterns of light which, depending on angle of the laser, can achieve a high degree of precision. </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=Wiggler_(tool)&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Limit_switch" title="Limit switch">Limit switch</a> – Electric switch type</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=Wiggler_(tool)&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=f0od-cp_9dg">Using an edge finder (video)</a></li> <li><a rel="nofollow" class="external text" href="http://www.metalwebnews.com/howto/wiggler/wiggler.html">Wiggler usage</a></li> <li><a rel="nofollow" class="external text" href="http://www.fignoggle.com/machines/x2mill/howTo-setupRotaryTable.htm">This shows you how to use a wiggler to center a rotary table.</a></li> <li><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=u1BH00OL6Q0">Laser Centering Device (video)</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output 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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/Brake_(sheet_metal_bending)" title="Brake (sheet metal bending)">Brake</a></li> <li><a href="/wiki/Die_(manufacturing)" title="Die (manufacturing)">Die</a></li> <li><a href="/wiki/English_wheel" title="English wheel">English wheel</a></li> <li><a href="/wiki/Hydraulic_press" title="Hydraulic press">Hydraulic press</a></li> <li><a href="/wiki/Machine_press" title="Machine press">Machine press</a></li> <li><a href="/wiki/Punch_press" title="Punch press">Punch press</a></li> <li><a href="/wiki/Screw_press" title="Screw press">Screw press</a></li> <li><a href="/wiki/Stamping_press" title="Stamping press">Stamping press</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Metalworking_hand_tool" title="Metalworking hand tool">Hand tools</a></th><td class="navbox-list-with-group navbox-list navbox-even 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die</a></li> <li><a href="/wiki/Tongs" title="Tongs">Tongs</a></li> <li><a href="/wiki/Vise" title="Vise">Vise</a></li> <li><a href="/wiki/Workbench" title="Workbench">Workbench</a></li> <li><a href="/wiki/Wrench" title="Wrench">Wrench</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Machine_tool" title="Machine tool">Machine tooling</a></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/Angle_plate" title="Angle plate">Angle plate</a></li> <li><a href="/wiki/Chuck_(engineering)" title="Chuck (engineering)">Chuck</a></li> <li><a href="/wiki/Collet" title="Collet">Collet</a></li> <li><a href="/wiki/Fixture_(tool)" title="Fixture (tool)">Fixture</a></li> <li><a href="/wiki/Indexing_head" title="Indexing head">Indexing head</a></li> <li><a href="/wiki/Jig_(tool)" title="Jig (tool)">Jig</a></li> <li><a href="/wiki/Lathe_center" title="Lathe center">Lathe center</a></li> <li><a href="/wiki/Machine_taper" title="Machine taper">Machine taper</a></li> <li><a href="/wiki/Magnetic_switchable_device" title="Magnetic switchable device">Magnetic switchable device</a></li> <li><a href="/wiki/Mandrel" title="Mandrel">Mandrel</a></li> <li><a href="/wiki/Rotary_table" title="Rotary table">Rotary table</a></li> <li><a class="mw-selflink selflink">Wiggler</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Category:Metalworking_measuring_instruments" title="Category:Metalworking measuring instruments">Measuring instruments</a></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/Bore_gauge" title="Bore gauge">Bore gauge</a></li> <li><a href="/wiki/Calipers" title="Calipers">Caliper</a></li> <li><a href="/wiki/Center_gauge" title="Center gauge">Center gauge</a></li> <li><a href="/wiki/Indicator_(distance_amplifying_instrument)" title="Indicator (distance amplifying instrument)">Dial indicator</a></li> <li><a href="/wiki/Engineer%27s_blue" title="Engineer's blue">Engineer's blue</a></li> <li><a href="/wiki/Engineer%27s_spirit_level" class="mw-redirect" title="Engineer's spirit level">Engineer's spirit level</a></li> <li><a href="/wiki/Feeler_gauge" title="Feeler gauge">Feeler gauge</a></li> <li><a href="/wiki/Gauge_(instrument)" title="Gauge (instrument)">Gauge</a></li> <li><a href="/wiki/Gauge_block" title="Gauge block">Gauge block</a></li> <li><a href="/wiki/Go/no_go_gauge" class="mw-redirect" title="Go/no go gauge">Go/no go gauge</a></li> <li><a href="/wiki/Height_gauge" title="Height gauge">Height gauge</a></li> <li><a href="/wiki/Machinist_square" title="Machinist square">Machinist square</a></li> <li><a href="/wiki/Marking_blue" title="Marking blue">Marking blue</a></li> <li><a href="/wiki/Marking_gauge" title="Marking gauge">Marking gauge</a></li> <li><a href="/wiki/Marking_out" title="Marking out">Marking out</a></li> <li><a href="/wiki/Micrometer_(device)" title="Micrometer (device)">Micrometer</a></li> <li><a href="/wiki/Optical_comparator" title="Optical comparator">Optical comparator</a></li> <li><a href="/wiki/Radius_gauge" title="Radius gauge">Radius gauge</a></li> <li><a href="/wiki/Ruler" title="Ruler">Ruler</a></li> <li><a href="/wiki/Sine_bar" title="Sine bar">Sine bar</a></li> <li><a href="/wiki/Straightedge" title="Straightedge">Straightedge</a></li> <li><a href="/wiki/Surface_plate" title="Surface plate">Surface plate</a></li> <li><a href="/wiki/Tape_measure" title="Tape measure">Tape measure</a></li> <li><a href="/wiki/Thread_pitch_gauge" title="Thread pitch gauge">Thread pitch gauge</a></li> <li><a href="/wiki/Vernier_scale" title="Vernier scale">Vernier scale</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Metalsmith" title="Metalsmith">Smithing tools</a></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/Anvil" title="Anvil">Anvil</a></li> <li><a href="/wiki/Forge" title="Forge">Forge</a></li> <li><a href="/wiki/Fuller_(metalworking)" title="Fuller (metalworking)">Fuller</a></li> <li><a href="/wiki/Hardy_tool" title="Hardy tool">Hardy tools</a></li> <li><a href="/wiki/Pritchel" title="Pritchel">Pritchel</a></li> <li><a href="/wiki/Steam_hammer" title="Steam hammer">Steam hammer</a></li> <li><a href="/wiki/Swage_block" title="Swage block">Swage block</a></li> <li><a href="/wiki/Trip_hammer" title="Trip hammer">Trip hammer</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Casting" title="Casting">Casting</a></li> <li><a href="/wiki/Metal_fabrication" title="Metal fabrication">Fabrication</a></li> <li><a href="/wiki/Forming_processes" 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