Collet Indexing Fixture - 1: Overview
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
Collet indexing fixtures are used on machines to rotate a work piece to precise angular positions for machining operations as opposed to a rotary table that generally machines the work piece while the table is revolving. Collet indexers are widely used for machining angular flats, hole patterns, etc, on cylindrical objects which are held in collets.

Collet ndexing fixtures offer a set number of angular positions which are very accurate. The number of positions are usually governed by a row of precision ground holes or notches in an indexing wheel that are engaged or disengaged with a set screw. The angle of the holes or notches and the total number of them will always multiply to equal 360 degrees... one full rotation of arc. A common indexing fixture shown on the right has 24 notches and each notch is15 degrees apart. Some indexing fixtures are not limited to the 24 positions as it is possible to lock the fixture between divisions. So, if there is some way to accurately measure angles between the indexing divisions then an indexing fixture may be all that is needed.

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label: Milling machine, collet indexer, indexing, setup, operation