Originally Posted by
dcprecision
I would run it faster, at least 4500 rpm. If the bearings give up the ghost, so what, you can always replace them with quality units. I am more concerned with the motor itself. A motor designed for inverter use has an armature that is resin impregnated and bonded and is criyically balanced. This keeps it from flying apart under the high "G" force loads encountered at high rpm. One other point!!!! I estimate that the RF type gear drive system is probably loosing at least 40% of its power and possibly more at high speeds due to heat production. A belt is going to be 95% + efficient. Just think of all the power you gain vs. gears. This is power where it counts on a cnc and far offsets the torque lost at very low spindle speeds.