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The Sherline 7.2mm (.2835) 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 to pass entirely through up to a maximum diameter of 3/16" or 4.5mm. Collets larger than this diameter, known as "pot" chucks, are not bored through but are instead 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, 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 the metric collets beginning with part number 1178, followed by digits indicating size in 0.1 mm increments. Special sizes can be ordered upon request.
1x Sherline 7.2mm (.2835) WW Collet
7.2 mm (0.2835")
ZIP Files
Maximum runout of .002 inches or less
Maximum diameter stock that can pass entirely through the collet is 3/16 inches or 4.5 mm
Collet sizes above 3/16 inches (4.5 mm) are not bored through and are only bored .260 inches deep
Shank diameter of .312-.313 inches and a .275-40 thread
