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Description
Sherline 6.8mm (.2677) WW Collet
Offers precise centering accuracy
Fits into specially designed adapter
Allows stock to pass through up to 3/16"
Manufactured to standard WW specifications
Available in metric sizes from .3 mm to 8.0 mm
The Sherline 6.8mm (.2677) 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, which in turn closes the jaws to securely grip the part being machined.
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 exceeding this diameter, such as the 6.8mm size, are referred to as "pot" chucks and are not bored through but rather to a depth of .260". This design may result in increased runout further from the collet's front, depending on the setup and part length.
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 are designed to fit Sherline's specific drawbar and adapter. It is advisable to verify compatibility with collets from other manufacturers. Sherline also offers a slightly larger adapter and drawbar set to accommodate some 8 mm collets from other brands.
