Would anyone on here be able to help me understand how to figure out the right size and gear ratio to make the pulleys for my spindle belt drive conversion? I would like a speed range from 100-6000 rpm. I'm using a vfd and a 3HP motor. What I don't understand is how to determine how fast/slow I can spin the spindle with this setup and have enough power to cut steel and aluminum without stalling the spindle.