Wiggler (tool)
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A wiggler, edge finder, digital edge finder , center finder or sticky pin refers to a tool used in the rotating spindle of a machine such as mill or drill. The device is used to accurately determine the edge or center of a workpiece during the setup phase of a machining operation.
A sticky pin is an improvised wiggler consisting of a piece of plasticine and a sewing pin, the principle of use is the same.
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To locate the center of some hole in a work-piece, the above describe procedure may be repeated on two opposing edges of the hole. A small amount of arithmetic will then allow the operator to index the machine (by means of the feed screws) to a point equidistant between the two edges: the center.
[edit] Electronic edge finder
Sometimes also referred as digital edge finder this instruments can locate edges of workpieces and also height offsets. It works in a NON-rotating spindle, this is a great advantage over its mechanical counterparts. It is battery operated and works by lightening up its internal LED (usually red)when the electrical circuit formed by the instrument and the machine is closed. The light is visible through its 4 widowed openings. A repeatability of 0.0002 inches or 0.005 mm is obtained (Salazar)
[edit] External links
- Wiggler usage
- This shows you how to use a wiggler to center a rotary table.
- Electronic edge finder vs 3d alignment indicator.
