Re: [CAD_CAM_EDM_DRO] Re: G201s repaired, now to bring up machine

John,

> Note: Both of the following tests must be done
> with the motor disconnected from the drive!

These motors won't go back on the drives until they are know to be good.

> I'm pretty sure an inductance bridge would detect a
> shorted turn. The winding with the short would have
> a lower inductance than the other windings.

I could use a nice inductance bridge for another hobby I've spent too
much money on....Tesla coils.

> If you don't have an inductance bridge, there is
> another test you could try. You need to be able
> to spin the motor slowly but steadily. For example,
> I'd chuck the motor shaft in my lathe chuck, set
> the lathe for 50-100 RPM, and bring the toolpost
> up next to the motor body to keep if from spinning.
> When you spin the motor shaft, it acts like a
> generator. The voltages across each winding
> should be nearly the same. If one is low, it
> probably has a shorted turn.

I'll test this tonight. I've got the lathe and my motor leads come out
to a terminal block so electrocution should not be an issue.

Thanks,

Chris