I have a machine that I converted from step-motors to servos, and I'm having a little trouble with the Z axis. It has an anti backlash lead screw with a 5tpi screw. This sort of worked, but the servo was working hard to move the head, and I wanted a little higher encoder resolution for better tuning. So I swapped in a nearly identical 10tpi lead screw set I happened to have on hand (removed from another stepper machine to get better speed and perfomance). I thought that the 10tpi screw should be easier for the servo to turn, but I'm finding that the opposite is true and the servo can't raise the motor without counter balance assistance when it could with the 5tpi. Does that make sense, or is the problem more likely that the 10tpi screw and nut are worn out and binding?
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