Stepper rotor/shaft re-mounting?

[Rufe0]

Hello

This may sound a little odd but I had a bit of a brain wave...

Has anyone ever tried or heard of drilling out the shaft of a stepper motor and then fixing in a new shaft?

[Neale]

Can I ask why you might want to do this?

[Rufe0]

Well I can imagine someone would need to do it to repair a motor or to fix it to/drive something that would be difficult without a special shaft of some kind.

My crazy idea is to gang multiple motors together, to create a 6/8/10/12 or more phase motor with corresponding resolution. I guess you could do it with couplers and unmodified motors but it wouldn't be as good.

[Neale]

As with many interesting ideas, I think people have come up with better ways to do it...
Modern servo drives use a motor to provide turning power, and a separate encoder to measure position. A typical encoder might have 2500 identifiable positions per revolution, giving much higher resolution than steppers with the benefit of full motor power available at all positions, unlike steppers using micro-steps. And in general, stepper motor shafts are capable of taking any torque that the motor could generate - sufficient to stall the motor, at any rate.
I'm not even sure if the price of steppers these days makes them worth repairing, if you've managed to abuse one to the point that the shaft is damaged. There's probably collateral damage internally!

[uli12us]

Afaik, you won't repair a stepper motor, if you disassemble him it is destroyed. The motor runs, but have lost the torque.

[JAZZCNC]

There's resonance and the Drives to think about here.!! Resonance from one motor will travel to the other sending the drives Bonkers. Each motor Drive will struggle to give stable performance because the Resonance compensation will be all over the place. Even the best Digital drives will struggle and Cheap drives with fixed Compensation will run horrible. Cheaper drives struggle with resonance from one motor so no chance with multiple motors and resonance cripples motor performance.

None starter to me.!