@uncle_bob: Backlash wasn't a problem for me. I think we should be in the mode of not fixing it until we see artifacts from it. The two nut idea will work but you have to be careful where the springs are. One nut needs to float with a spring contact that pulls away any play.
FWIW, I design for 600RPM as my max working speed. Many stepper charts that I have found show this to be the point where you drop to about 1/2 torque.
FWIW, I design for 600RPM as my max working speed. Many stepper charts that I have found show this to be the point where you drop to about 1/2 torque.