I don't know. The motors are 6 amp. Most stepper motors fall into the 36-50 volt range though. I would guess that it's 48 volts and 15-20 amps. The specs claim a resolution of .0004, so they aren't micro stepping much--maybe only 1/2.
Oh, and those ballscrews are only 4mm per revolution, so about 6 TPI. Those big hairy N34 motors must really be honking to drive those screws so fast.
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