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Dodgy electric motor - what's going on here?

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I had a similar problem with my DA sander and ordered new brushes when a cleanup of the commutator failed. I was a bit suspicious as the old ones still had some length in them but it seemed to work better. Not long after it stopped again. It was one of the two support bearings which had gone tight. A very few £ later and it's perfect again.

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If you connected a meter on resistance across the brushes (power off) and rotate the motor slowly you should have a more or less constant resistance (it may jump a little) but if you have any spot thats short, open or very different it will indicate your problem. I would expect in the low 10's of ohms.

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