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My Dremel 3000 makes a grinding noise and fluctuates speed while in the low speed range. Why is this?

I have a Drexel 3000 that Iveused on three occasions now. At low speeds 2-4 it seems to have trouble spinning and makes a grinding noise. It will also fluctuate speed dramatically while on a single speed setting but again, I only notice this at low speeds. I checked the motor brushes and they looked fine. Any ideas?

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  • Speed Master
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I have one that I must keep pressing ******* the speed control with my thumb during use otherwise it is hopeless except at or near maximum. The potentiometer is of poor quality.

Posted on Jan 02, 2017

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Posted on Jan 02, 2017

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