What I was thinking is to add a button sized potentiometer called
"speed override", where I can make everything run faster or slower.

i


This is EXTREMELY handy. No way do you get feeds just right on one of parts.
I've got a spindle speed pot on all my machines also. If you've got manual
machine experience you can dial in proper feeds and speeds in just a few
seconds. In my case, I've never used a speed feed calculator.

Karl