Maybe this question is OT for this group, but I hope not. Anway, consider a CNC mill with 3 axes and a DC varying speed spindle. From what I understand, and this may be way off, a PC must control 3 servo/stepper motors and the spindle speed, right? I know the speed of a DC motor can be controlled by PWM, and the samw with steppers. So is the computer providing all of these pulses? If not, what is? I guess I'm curious how a PC would tell another harware device how fast the spindle should run. Any help would be great. Thanks, Lucas.
16 years ago