X2 Mini Mill - Motor Armature

After many years of good service, the DC motor on my X2 mini mill started its periodic popping and arcing.

Upon stripping the motor I found the commutator grooved so I skimmed it in the lathe, after finishing the clean up I noticed that there was no meat left for another future skim.

I purchased a brand new armature and installed it in the old casing, installing a new set of carbon brushes.

After re-installation and power on I noticed that the motor ran up to speed well but was not stable speed wise, also there is no torque on start up and minimal torque during running.

I re-installed the old cleaned up armature in order to troubleshoot and there is plenty of torque and the speed is stable.

I checked the new armature with a multimeter, the 180 degree check between segments shows good. The adjacent segment check shows good and the individual segment to laminates shows good.

Anybody any ideas.

I have since purchased a new motor and will keep the old motor with skimmed armature as a spare.

Thanks

Keith Wood

Montreal

Presumably your mains is 110 V? Maybe they've sent you a 220 V component?

John

Yes, mains supply is 110v.

The armature was supplied by a supplier in the US and I believe all the motors use around 90vDC supplied from the controller.

Maybe you are correct.

Regards.

Keith

My UK X2 has a motor plate that reads DC 230V.

Neil

Neil

I think you have clarified the situation.

Maybe the armature manufacturer sent the incorrect ones to my supplier.

I will relay this information to them.

Best regards.

Keith Wood

Have you compared the dc resistance between the two armatures?

Had problems like that on a washing machine.

The brushes were floating off the armature when the motor was ramping up.

Dave Shield