Hi there, just finished a high speed conversion to my old 1959 round head lathe. Removed the old 1.5hp 4 pole single phase motor and replaced with a 3 phase 2 pole 3 hp motor and a jaguar VXR VFD from powercapacitors. Also reduced the motor pulley ratio by 25%. I now have upto 2450rpm (70HZ) and minimum of 22rpm (20HZ). Also now have motor load read out etc and variable speed, jog and reverse. It all runs from a 16amp single phase breaker. Awesome conversion. Let me know if you want any more details.