X2 Mini Mill – Motor Armature

[Keith Wood 1Participant @keithwood1]

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

[Keith Wood 1Participant @keithwood1]

Motor re-build problems

[John HaineParticipant @johnhaine32865]

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

[Keith Wood 1Participant @keithwood1]

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

[Neil WyattModerator @neilwyatt]

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

Neil

[Keith Wood 1Participant @keithwood1]

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

[John RuddParticipant @johnrudd16576]

Posted by Keith Wood 1 on 18/07/2018 14:51:59:

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.

Thanks

Keith Wood

Have you compared the dc resistance between the two armatures?

[Dave Shield 1Participant @daveshield1]

Had problems like that on a washing machine.

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

Dave Shield

[Author]

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