Question about Dremel 395 Variable Speed Multipro Rotary Tool Kit

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I was working with the dremel and it shut down and would not turn back on, the motor was not hot. I'm wondering if it has anything to do with the brushes in the side of the motor housing?

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My dremel started doing that too. If I rubbed the sanding drum along a piece of wood, it would start up again. I think the brushes and the copper armature get glazed over with non conductive dust and possibly insulation smoke which disconnects it enough to stall out. Change the brushes to the new ones in the kit. After a year of heavy use mine slowwed down to about 300 rpm and then died. A very nice tool but I prefer the Makita which is about three times this size just because it is longer lived.

Posted on Apr 10, 2011


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No power

If you already checked and replaced the brushes but it is still not turning then you do these:
Try to see if your unit have a safety breaker and reset it,most of power tools have also a fuse in the plug itself.
Also some have a thermostat fuse.,you can find it attached on the rewined coil.

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Brushes are usually conducting carbon sticks at one end of the rotator (spiny bit in middle of motor) there will be two (opposite each other) connecting to the commutator (round copper looking ring with slits in it). The brushes will each have a spring that pushes them onto the commutator and a wire to carry the electricity to the brush.

As the rotator spins, the brushes connect to different coils via the commutator. This allows the electricity to energize the next set of coils to make the motor spin more.

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