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Description
Sherline .3mm (.0118) WW Collet
Ensures high centering accuracy
Fits into tapered adapter in headstock
Accommodates diameters ±.001″
Includes inch and metric sizes
Manufactured to WW specifications
The Sherline .3mm (.0118) WW Collet provides a precise and efficient method for mounting cylindrical parts or bar stock in a lathe, ensuring high centering accuracy. This collet functions as a small, precision 3-jaw chuck that fits into a specially designed tapered adapter within the headstock. The mechanism involves a drawbar threading through the headstock and into the collet's backside, drawing it into the adapter and causing the jaws to close and securely grip the part for machining. Each collet size accommodates a limited range of diameters, approximately ±.001″ (.02mm), ensuring precision in part mounting.
WW collets are distinct from milling collets due to their through-hole design, allowing stock with a maximum diameter of 3/16″ or 4.5mm to pass entirely through. Collets larger than this diameter are referred to as "pot" chucks and are not bored through, being only .260″ deep. The collets are manufactured by Sherline to adhere to standard WW specifications, with a shank diameter of .312-.313 and a .275-40 thread. It is crucial to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter.
Sherline collets are available in both inch and metric sizes, with inch sizes ranging from 1/64″ to 5/16″ and metric sizes from .3 mm to 8.0 mm. These collets are not hardened, and their maximum runout is .002″ or less, provided the WW collet adapter is trued as per instructions.
