Quote Originally Posted by Radu_Andrei View Post
the ones that came with the kit, individual for each motor
S-350-60 +60V 5.85A
60V is a bit low for nema 34 but you will be limited with the drives you have.

What micro step rate do you have the drives set at. And what max velocity are you using in Mach (under motor tuning)

This might just be the cause that you are trying to turn the motor too fast