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Description
Sherline 8.0mm (.3150) WW Collet
Ensures high centering accuracy
Accommodates stock up to 4.5mm
Features through-hole design
Offers .002″ or less runout
Manufactured to WW specifications
The Sherline 8.0mm (.3150) 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 to be machined. This system is renowned for its accuracy, accommodating a small range of diameters with a tolerance of approximately ±.001″ (.02mm).
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. However, the 8.0mm collet, being larger than the through-hole diameter, is classified as a "pot" chuck and is not bored through, but rather 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. The 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.
