I have just fitted a new set of G3D A4988 drivers to my OrdBot (Nema 17 motors / Arduino Mega / RAMPS 1.4).
I have calibrated the X and Y steppers with a volt meter and they work OK (around 0.36v). However, the Z axis is proving more difficult to set up. It is easy to get the motors buzzing.
I am not clear on the voltage settings for the Z axis stepper which has two motors connected to it. Can any one advise?
Thanks