DoN. Nichols wrote:
On 2009-01-02, Jim Stewart wrote:
I just finished a cast iron adapter plate that
mounts a plain-back 5C collet chuck to the 2"-8
tpi spindle of my lathe. I can easily dial in
the mounted chuck to .0005" runout, the limit
of my measuring capability.

When I remove and reinstall the chuck/adapter
plate assembly and check the runout, it varies
from .0005" to .004". It only takes a couple
of minutes to mount the indicator, loosen the
bolts and recenter the chuck, but I was hoping
for a little more repeatability.

Am I asking for too much here?

For a threaded spindle -- yes I think so.

Good Luck,
DoN.

I'm not so sure Don ... If he machined the recess on the back of the plate
so it seats on the register face , it should be pretty close . I can remove
and reseat my 4 jaw with a piece of stock dialed in and have it close enough
that my dial indicator can't mearure the difference.
--
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