Single Phase motors on 3 Phase

If you have a neutral as part of your three phase installation then you will have 240v between any phase and neutral so single phase motors (or anything else) can be run of it.

I don't know of a way to create an artificial neutral with a suitably low impedance to draw any useful power with just capacitors.

Bob

One pont is that there may be a good reason why the manufacturer did this and without access to an original schematic, it's hard to tell if the motor is actually 3 phase and not some sort of split phase motor.

One reason might be to limit the torque, as you never get full power from a 3 phase motor using a cap to phase shift the third phase. In the absence of a shear pin, it could be a reasonable way to limit torue and thus avoid mech damage at the end stops.

Theat's for the feed motor - the spingle motor would never be converted to 1 ph from 3 using single cap by any sane manufacturer, as you would not get full power and such techniques are considered something of a bodge in electrical engineering circles...

Chris