Mach 3 with Probotix hardware

[Fabricator]

Im running the PBX-RF card, with SideStep stepper controller, with 280oz bipolar stepper, with 1/4-20 screws, I have been trying many different set ups in motor controller settings and cant get it to do more than 36 inch per min. without missing steps.
Anyone have best setting from the motors?

[probotix]

That's actually pretty impressive for 20 threads per inch screws. On the old V90s, we were getting 200 IPM, but we were using high dollar acme screws that only took 5 turns to move an inch. Our current machines can run 400IPM with two revs per inch screws on 570ozin motors.