"I am actually using rack and pinion with a 3:1 gear reduction on the X&Y axes. Those are the axes I am most concerned about at the moment. Knock on wood, I don't seem to have an issue with my Z axis. My Z is using 1/2-10 leadscrew, so if I am understanding correctly, I am already pretty close to the 10mm pitch right?"

Not even close by my calcs. a 1/2-10 leadscrew has 10 turns per inch and a 10mm pitch ballscrew has 2.54 turns per inch.

I assume you are using the 3:1 reduction and integral pinion and if that pinion has 20 teeth and a 1" pitch diameter, at least that what my calcs show. Based on those number you have .954 revs per inch. That motor should be reliable to 600 rpm on 48V. That should yield 500ipm rapids on the XY. Personally I would jump up a couple teeth on the pinion and run them on 60 volts as the drives are rated for 80, I think. Good even if they are rated for 70. You will be lucky to ever get near a hundred on the Z if its 1:1 with the screw.

Here is what you need to know about reading between the lines on the provided motor torque chart. Even tho is doesn't say this, assume those numbers are at full step settings. If set at 1/8 m/stepping assume 20% of that number to be accurate, ~40% if using 1/4. Way less than either if using 1/10th.

https://www.micromo.com/media/wysiwyg/T ... g%20WP.pdf