The Sherline collet fixture was designed to be mounted on the surface of the rotary table or the mill table. A knurled ring allows WW collets to be pulled into the taper and closed without the use of a drawbolt from the back.
This is particularly useful for clockmakers for gearcutting on a gear blank that has a pinion shaft attached that can be held in a collet. A bushing is provided that fits into the center hole of the rotary table and helps center the fixture on center. T-nuts and attaching screws are also provided for clamping the fixture in place in the rotary table or mill table T-slots.
WW collets vary somewhat in size depending on manufacturer. This adapter holds those collets made by Sherline with a .312-.313 body size and .275-40 thread, which we refer to as WW collets. Other common "WW" collets have a body size of .314-.315 which we refer to as 8.0 mm collets. A fixture for these collets is also available as P/N 1165. It looks identical except that it is identified by a groove machined around the body. If you are using a brand of collets other than Sherline, measure the body diameter with a micrometer before deciding which collet fixture to order.
Sherline WW Collet Fixture Instructions
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