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Description
Sherline 1.7mm (.0669) WW Collet
Ensures high centering accuracy
Accommodates precise diameters ±.001″
Allows stock to pass through up to 4.5mm
Features maximum runout of .002″ or less
Manufactured to standard WW specifications
The Sherline 1.7mm (.0669) 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. A drawbar threads into the collet's backside, drawing it into the adapter, which causes the jaws to close and securely grip the part to be machined. Each collet is designed to accommodate a narrow range of diameters, approximately ±.001″ (.02mm), ensuring exceptional accuracy.
WW collets are distinct from milling collets due to their through-hole design, allowing stock to pass entirely through. The maximum diameter stock that can pass through is 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 maximum runout is .002″ or less, and when the WW collet adapter is properly trued, it operates with optimal precision.
Sherline collets are logically numbered, with inch collets starting with part number 1160 and metric collets with 1178, followed by digits indicating size. These collets are manufactured 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 also offers a slightly larger adapter and drawbar set to accommodate some other brands of 8 mm collets.
