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Description
Sherline 4.8mm (.1890) WW Collet
Offers precise centering accuracy
Fits cylindrical parts or bar stock
Allows stock through up to 4.5mm
Ensures maximum runout of .002″
Manufactured to WW specifications
The Sherline 4.8mm (.1890) WW Collet offers 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 is designed to accommodate a narrow 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 to pass entirely through up to a maximum diameter of 3/16″ or 4.5mm. Collets larger than this diameter are referred to as "pot" chucks and are not bored through, being only .260″ deep. The collet's accuracy is notable, with a maximum runout of .002″ or less, provided the WW collet adapter is trued as per instructions, ensuring optimal performance.
Sherline collets are manufactured to standard WW specifications, with a shank diameter of .312-.313 and a .275-40 thread. They are not hardened, and it is crucial to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter. The collets are available in both inch and metric sizes, with special sizes available upon request.
