Of course if the spindle is too underpowered, you won't be able to maintain speed anyway.

Alan
Understood. I just want better regulation of the speed so it doesn't bog down when I mill something that should be milled slower. If I take deep cuts now, all it does is plug up the end mill. I haven't even thought about tapping.

I've got a a couple different sensors I can try. I am going to take the rpm right from the spindle, not the motor. Hopefully this weekend I'll get a chance to get it done.

chester, I think I'll start with two pulses per rev and see what kind of results I get. If I don't get the low speed response I want, I'll add more. I suppose its important to get them spaced equally, so I'll be watching for that.

Bill K.