Re: servo or stepper size selection

Bernard,
what type of software are you using for the nc controller?
do you have ballscrews on the Z ?
my bp clone with ballscrews on the Z and 40 in/lb servos can rapid
at 150 ipm+

> of torque. (My mill required 56lb/in, 784oz/in to start moving.)
> Steppers have high torque at low speeds which drops off at the

higher

> speeds, servos on the other hand have very little low end torque

and

> require to move fast to bring it up, this is fine for X&Y.