I bought a milling machine with a 3ph 3hp motor. I then bought a 3ph 3hp motor to build a RPC, which I built and it worked. But then I bought a 2.2kw vfd and that is just so cool.
So now I have this second motor and I'm pretty sure I'm going to fit it to my 14-40 lathe and drive it with a vfd. At this point I'm working on pulley ratio possibilities.
My question is:
How much can/should I over speed the motor. I think the nameplate RPM is 1725. What would be the effect of running it 3000 RPM. How much power would it produce; more, less? What about heat? Is that too much speed for the bearings?
I want a top spindle speed of 3000. If I can overspeed that much I can run a top gear/pulley system of 1:1. At 60 cycles, top gear would be 1725 and low gear about 100 RPM. And slower speeds would be achieved with lower cycles.
So another question is: How does the torque curve relate to reduced frequencies?
Thanks, Ozzie