Originally Posted by Mike Nash  Could it be in the screw bearing or ballnut mount? It may or may not be hard to check. If you can get an indicator on the end of the screw, or even on a thread, and push/pull on the table without turning the screw it should not move. But don't over tighten the bearing.
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Got it! This was the problem. I pulled the motor off and the connectors and put the indiciator on the end of the shaft. Surprise, surprise, .006 of play.
I did not have the nut on the end of the ballscrew *quite* tight enough. I tightened it down around a half turn or so and that took care of it.
I ran the table back and forth a few thousandth either way and the indicator and DRO matched.
Yay!
Mike