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Description
Sherline 7.8mm (.3071) WW Collet
Ensures precise centering with .002″ runout
Accommodates up to 3/16″ or 4.5mm stock
Features bored design .260″ deep
Uses standard WW specifications
Available in metric sizes up to 8mm
The Sherline 7.8mm (.3071) WW Collet provides an efficient method for mounting cylindrical parts or bar stock in a lathe with high centering accuracy. This collet functions as a precision 3-jaw chuck that fits into a specially designed tapered adapter within the headstock. The drawbar, threading through the headstock into the collet's backside, pulls the collet into the adapter, causing the jaws to close and securely grip the part for machining. Each collet size accommodates a limited range of diameters, approximately ±.001″ (.02mm).
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 known as "pot" chucks and are not bored through, being only .260″ deep. The collet's maximum runout is .002″ or less, ensuring precise operation when the WW collet adapter is properly trued.
Sherline collets are logically numbered, with metric collets beginning with part number 1178 followed by two digits indicating the size in 0.1 mm increments. 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.
