[2_many_hobbies]

I am saving up to buy a 10x22 and can get one for cheaper than usual but it only has a 3/4HP motor on it.

I can get a 3HP 3Phase 240V 56T frame motor and 0-400Hz VFD for around $475 but is the 10x22 built well enough to handle a 3HP motor??

Also I imagine this will drastically alter the lead/feed rates for threading as I imagine they are geared directly off the motor (1725rpm I imagine) and the headstock is geared separately. If I alter the motors speed I would need to do some math to match feed/spindle speeds or set the motor to the stock speed whenever I want to cut threads right?

I would appreciate a picture of the gears setup of the 10x22 and anyone's experience with a VFD and threading by hand.

Thanks!

[Al_The_Man]

I think 3hp is pushing it for that size of lathe, I would say a 2 hp would be max required for that lathe.
If it is a 4 pole motor, then the rpm will be the same at 60Hz.
If it is a standard non-vector rated motor, the maximum speed is usually considered around 120hz for a 4 pole.
Al.

[2_many_hobbies]

I can get a 3HP for cheaper than a 1-2HP one due to the volume the company I work for orders. But I figured it was pushing it.

I don't necessarily need to replace the original motor but Its part of the CNC conversion and nice to have either way. I'll run the machine by hand for the first quite a while as CNC is the last thing on my list.

I do have a question about the 10x22 though, what kind of precision can one expect out of one with a general tune up? It looks 100x the quality of the 7x/8x and maybe 25% better than the 9x. Also how deep of a roughing cut can you take with C6 carbide tooling, my current lathe even on aluminum maxes out at 0.01"/pass but im hoping to get 0.06"/pass with the larger motor.

[kawazuki]

Sorry if this sounds a bit naive but isn't hp just a function of rpm and torque? If the rpm is the same the torque is increased - I would have thought there's more chance of stripping gears and shearing pins? If it spins too fast then increase / lower the input gearing which will improve torque at the spindle?