Quote Originally Posted by Muzzer View Post
Sorry, I hadn't twigged that you were planning on using this motor for the SPINDLE drive. That's probably not the best idea if I have understood what you are planning. I'd seriously recommend you use a proper VFD rather than a stepper or servo drive, which are intended for position control, rather than speed control.

Forgive me if I've got the wrong end of the stick here. I have no desire to criticise so much as help you avoid disappointment. Perhaps Jazz or someone else will dive in here, in the interest of constructive advice.
You have misunderstood the thread. I have a very good VFD and have no intentions to replace that. This is a 4th axis which I experiment with as a lathe / 4th axis combo.