At 1500mm/min with a 5mm lead, you are spinning your steppers at 5rev/sec
Do the motors make nasty sounds when they stall? Then it is probably resonance - look up the thread on DIY dampers or get a set of Geko drives.
Also, with a 24 volts supply the drives are at the edge of reaching full phase current at 5 rps. So you are loosing torque rapidly at this point. Kick up your PS voltage or run the motor phases in parallel
Running the motors in parallel with the same driver would allow you to get full torque to about 15 rps but the "full" torque would be about 63% of nameplate torque on the motor.
Aaron |