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Posted to rec.crafts.metalworking
Karl Townsend
 
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Default How are chuck keys sized



Good luck. They generally get listed by just a part number. Variables are
the
pilot size, number of teeth and gear diameter. I have an imported chuck in
my
lathe that is fine, but the pilot on the supplied key is a bit undersized,
so
it makes it hard to get good torque on the chuck.


I'm in ths same boat on a real nice chuck for my CNC mill. I bought the four
size in 1 key style. Found the side that most closely matched on the gear
teeth and then installed a bushing to fit the pilot hole.

Karl