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Description
Sherline 7.6mm (.2992) WW Collet
Ensures high centering accuracy
Facilitates precise cylindrical mounting
Offers a maximum runout of .002″
Compatible with Sherline's tapered adapter
Manufactured to standard WW specifications
The Sherline 7.6mm (.2992) 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 into the collet's backside, drawing it into the adapter, which in turn closes the jaws to grip the part securely.
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 exceeding this diameter, known as "pot" chucks, are not bored through but are instead bored to a depth of .260". This design may result in increased runout for parts extending further from the collet's front.
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 Sherline's adapter when considering collets from other manufacturers. Sherline also offers a slightly larger adapter and drawbar set to accommodate some 8 mm collets from other brands.
