I have a set of the 380 oz-in NEMA 23 steppers (4.1mH inductance) and now a set of these 320 oz-in (2.8mH inductance) motors. I'm driving a 3 axis Router with 10mm lead ballscrews and a Mini-mill with 20 TPI steel nut leadscrews. The issue with steppers is always the drop off in torque with speed du ... view full review