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Nick Müller
 
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Default lathe chuck runout

Jim Reed wrote:

Then turned this piece around and chucked it in the 3 jaw, using the cut
surface as the holding location. When I measured the runout (still using
the cut surface to measure), I was indicating .020 out. I tried this
several times and it varied from .005 to .020. I found some rust on the
inside of the jaws I thought might be causing the problem, but removing it
didn't seem to help.


The chuck has one hole (for the key) indicated with a zero. Use this one
for precise (more or less) work. Also when turning the piece, don't
rotate it, but put a mark on it so that the same place goes to the same
jaw.

HTH,
Nick
--
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