"Bob La Londe" wrote in message ...

My bigger import lathe is not bad. I can dial stuff in by hand to about
3 tenths. The problem is under power the indicator needle turns into a
blur about 1.5-2 thousandths wide. For 99% of what I do that is fine,
but that other 1% is growing. Is the only answer to install a 3 phase
motor? I'm not completely against it, but its a bit of a job to move
the lathe, swap the motor, and reconfigure the controls. Not something
I can do in an afternoon.

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Can you disconnect the motor from the drive train?
If you can, and the needle still vibrates, the motor may be unbalanced.