"Karl Townsend" remove .NOT to reply wrote
in message link.net...


Check the jaws by inserting something hard and ground----an end mill
shank,
for example, or a drill blanks if you have them. You want this item
deep
in the chuck, so the jaws grip at the very back, or inside the chuck
body.
Snug up the jaws (lightly, don't get down on the wrench), then see if
you
can insert a feeler gauge between the jaws and the chucked item at the
outside end. If you can, the chuck is sprung. It can be salvaged by
grinding the jaws, which we can talk about if you find that's the
problem.


FWIW, after getting your chuck clean make up a fixtrue like so:
http://lathe.com/tips/chuck-jaw.htm (Scott Logan's web site)
Then use a carbide boring bar to just shave a RCH off each of the jaw
ends.
Everything ends up square and right on center at that diameter.

Karl


Is that a metric or Imperial measure?