VFD for return to 3ph?

[Sunset Machine]

I've never ran this mill under 3-phase, but I've ran others. I also deal with a lot of machined parts where I work. No difference that I can see, and I do look. A few years back I converted a surface grinder to single phase and it works fine too, feeling certain that (for me) converting it back to 3 phase would be a waste of time.

The big attraction for a homemade RPC is to not have to buy big single phase motors or VFD's.