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The Sherline 7.9mm (.3110) 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.
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, known as "pot" chucks, are not bored through and are only bored to a depth of .260". The collet's accuracy is notable, with a maximum runout of .002" or less, provided the WW collet adapter is trued as per instructions.
Sherline collets are logically numbered, with metric collets beginning with part number 1178 followed by digits indicating 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, though they are not hardened. It is crucial to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter.
1x Sherline 7.9mm (.3110) WW Collet
7.9 mm (0.3110")
ZIP Files
Maximum runout of .002″ or less
Maximum diameter stock that can pass entirely through the collet is 3/16″ or 4.5mm
Collet sizes above 3/16″ (4.5mm) are considered pot chucks and are not bored through
