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Several machine collets (top and centre) and a dismantled pin chuck (below). Generally, a collet chuck, [3] considered as a unit, consists of a tapered receiving sleeve (sometimes integral with the machine spindle), the collet proper (usually made of spring steel) which is inserted into the receiving sleeve, and (often) a cap that screws over the collet, clamping it via another taper.
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 ...
There are adaptors available to allow the use of one type of taper tooling, e.g. Morse, on a machine with a different taper, e.g. R8 or vice versa, and simpler adaptors consisting of an externally and internally tapered sleeve to allow a small Morse tool to be used in a machine of larger bore.
A range of sleeves may be used to bring the size of the smaller Morse tapers up to the size of the drive spindle's larger taper. Sockets are also available to extend the effective length of the drill as well as offering a variety of taper combinations. The detail image shows a Morse taper shank on a 16 mm diameter drill bit.
[19]: 71 The rubber sleeves are typically secured with stainless steel worm drive clamping bands, which compress the rubber to make a tight seal around the pipes and fittings. These pipe clamps are similar to hose clamps , but are heavier-duty and ideally are made completely of stainless steel (including the screw) to provide maximum service life.
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