Thanks for all the input. From what I've read online, the idler motors are supposed to be the same hp rating. It's also my understanding from what I've read here, that the generated leg is always going to be 208V, but I may have misinterpreted that. My new to me Gorton mill has a 10hp spindle motor along with a 3hp motor for the XYZ axis drives. I'm thinking that a 15hp RPC would be adequate for that, but they seem to generally recommend double the RPC output of the motors to be driven. If I can't combine them, I will probably run the 5 & 15hp RPC's independently, and run the big one for the Gorton exclusively. If neccessary, I guess I could run the 7.5 hp lathe simutaneously to up the power available. Bob K, that was my thinking also, but I have no empherical evidence to substantiate that. Maybe Mark, or someone else better versed in 3 phase generation could enlighten us. I don't mind a little experimentation, but I would hate to let the magic smoke out. Mike