A4988 Stepper Driver Calibration

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

I usually just turn up the bottom pot until the motors start moving nicely.

Edited 1 time(s). Last edit at 05/29/2014 05:38PM by ejbantz.

Ramps 1.4 has the Z-axis steppers connected in parallel, which requires twice the voltage. Setting it to the same as your others steppers will leave the z-axis under-powered.

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Thanks. So I need to be somewhere around 0.65v to 0.75v I guess ?

Edited 1 time(s). Last edit at 05/30/2014 05:03AM by dave3d.