COLLET 6 MM FOR 34 902
A collet is a sleeve with a (normally) cylindrical inner surface and a conical outer surface. The collet can be squeezed against a matching taper such that its inner surface contracts to a slightly smaller diameter, squeezing the tool or workpiece whose secure holding is desired. Most often this is achieved with a spring collet, made of spring steel, with one or more kerf cuts along its length to allow it to expand and contract. An alternative collet design is one that has several tapered steel blocks (essentially tapered gauge blocks) held in circular position (like the points of a star, or indeed the jaws of a jawed chuck) by a flexible binding medium (typically synthetic or natural rubber). The Jacobs Rubber-Flex brand is a name that most machinists would recognize for this type of collet chuck system. Regardless of the collet design, the operating principle is the same: squeeze the collet against the tool or workpiece to be held, resulting in high static friction. Under correct conditions, it holds quite securely.
Each collet generally has only a narrow clamping range, which means that a large number of collets are required to hold a given range of materials in the chuck, unlike with many other types of chuck that will generally cover a wide range of sizes. This gives collet chucks the disadvantage of relatively high capital cost.
The collet’s advantage over other chucks is that it manages to combine all of the following traits into one chuck, and this combination is highly valuable in an environment of repetitive part production:
1. Speed of chucking (unclamp one part, switch to a new part, reclamp)
2. Self-centering
3. Strong clamping force
4. Resistance against being jarred loose (untightened)
5. Centering at a high level of precision (runout is less than 0.005 in (0.13 mm) TIR)
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