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Description
Sherline 7.1mm (.2795) WW Collet
Ensures high centering accuracy
Fits into a tapered adapter
Allows through-hole design
Limited to 3/16" stock diameter
Adheres to WW specifications
The Sherline 7.1mm (.2795) WW Collet provides an efficient and precise method for mounting cylindrical parts or bar stock in a lathe. 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. This system ensures high centering accuracy, although each collet size accommodates only a narrow range of diameters.
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.
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. It is crucial to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter.
