Hello, I just completed a retrofit and when running emc I am measuring almost .06 in backlash with all three axis. The system is a 5Tpi ball screw, 2:1 reduction to a DC servo, 500 line bdi encoder, and Rutex 2010 drives. I have emc set for step and direction control. When I manually rotate the ball screw two turns clockwise and then two turns counterclockwise I return within .007 of where I should. This little backlash might be 20 year old ballscrew, or my less then exact manual rotation. This would suggest to me that the screw is not the problem. This is the exact hardware and configuration that I set the machines sibling with and it runs like a champ. Any ideas on what can be causing this problem?
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