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Description
Sherline 6.6mm (.2598) WW Collet
Ensures high centering accuracy with .002" max runout
Features a through-hole design for stock up to 4.5mm
Fits into a tapered adapter for secure part gripping
Offers precise sizes from .3mm to 8.0mm and 1/64" to 5/16"
Manufactured to standard WW specifications
The Sherline 6.6mm (.2598) WW Collet provides 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 grip the part securely.
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 two digits indicating the 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 important to verify compatibility with other manufacturers' WW collets to ensure they fit the Sherline adapter.
