Are the Zapp 3NM steppers good with their PM-752 drivers?

[irving2008]

I thought it was 8 amps per motor, since there's 2 phases?
Anyway, I got lucky and won a 500VA toroidal transformer for £20 on eBay so I'll be using that.

I changed the pulleys round (had to bore them out to the right diameter and stuff) to get 1:1. Now I'm getting 42mm/s on the X axis :)
Bad news is the Y-axis for some reason refuses to even go at 25mm/s without stalling the motor. Not really sure why, maybe something to do with the belt tension and how tight the nut is...
Not tested the Z yet.

No, thats peak current. In general the 2 phases are never both powered fully all the time so a sort averaging occurs and anecdotally (although Mariss of Gecko fame did show the maths once) its 66%!

Its usual to quote feed speeds in mm/min for milling - so 2520mm/min is good, 1500mm/min isnt bad tho

Strange... if you haven't already, try swapping driver channels to validate its not a driver issue, then motors (assuming they are the same) to validate its not a motor issue