Good morning all,

I have a Rong Fu 31 mill/drill machine. For a bench top machine it is not too bad and has served be well for the past 15 years or so. I recently upgraded the DRO to the machine and that has made it even better.

The one that that is really annoying about the machine is the double belt system for variable speed. After a while moving those belts around between the 3 pulleys gets old and I am looking for alternatives.


The motor is a single phase motor that can be wired for 120VAC or 220VAC, currently wired for 220. Controlling the on-off is a rotary switch like that found on many industrial machines.

Without replacing the motor, is it possible to control this motor with a VFD? If so, which would be a good choice?

Chris D.