I have recently acquired a 1980 Enco 9X42 model 2S Bridgeport clone with a 3 phase motor. I believe it to be a 2 HP motor but I really have no idea as I cant read the data plate due to it's age. I have it hooked up to a RPC now and it seems to run fine. I would like to convert it over to a VFD but being really green about this type of switch I would like some guidance before I start buying a VFD and cutting wires....lol. First question is should I just leave the RPC out of the question and just run 220V single phase to the VFD and if so does this derate the motor HP in any way? Secondly what else is needed to monitor the spindle RPM? Just in the planning stages at this time. I have the knee blown apart to clean up years of neglect. So far it looks ok. I'm not building aerospace parts. Just looking to make some car parts and other stuff as needed. Thanks in advance.