Running on 425 oz-in steppers on the X3 mill running 5TPI (0.200" pitch) ballscrews? I know going with 269 oz will get higher rapids, but is the torque enough for the X and Y?
Here's my attempt to calculate force produced by the motors:
Torque=Force*pitch/(2*pi*eff)
Torque = 269 oz-in = 16.8 lb-in
Eff = 0.90 %
Pitch = 0.200 inch
Force = 475 lbs at stall.
If we estimate torque to be 70% at normal machining speeds, then force is 332 lbs.
To me, this doesn't sound enough, since cutting forces alone can be over 100 lbs for large cutters, plus friction of the ways, and the large inertia of the table.
Anybody tried using 269's on the X3?