Im using mach 3 with servo motors and gecko g320's. Also have ballscrews and ballnuts. When repeating a simple circle, the y axis seems to loose ground. After about 30 passes, the center of the circle is gone and im left with horse racing track shape, round on the corners and flat on the sides. I mic the flat sides and they are the same, so the x axis is doing its job, but the y axis doesnt return to the same point. Ive tried with and without backlash compensation, and get the same results. Plus if it were backlash I would expect to see a not so round circle even after 100 passes. Any ideas?
Thanks all.