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Posted on Jan 02, 2017
SOURCE: Dremel model 395, Type 5
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.
If the motor gets very hot the brushes can stick in their housing and loose contact.
My Dremels (and type) all have the motor cooling exhausts and intakes where you need to hold them. It is quite hard to not block them during use..
I would also get hold of a multi-meter or continuity checker and check that the lead into the motor has not broken inside. Another common problem.
Posted on Aug 01, 2008
SOURCE: Bosch 4000 table saw won't work
OK sounds like you are handy. You have electric to the brush tubes? (first unplug saw to test) If yes then I would remove the brushes to see if they were making contact with the commutator. Does the blade spin freely? If not you might have a bearing problem. I would again use air after removing the brushes and then reinsert making sure they seat on the armature. If still nothing then if you are comfortable I would pull the motor housing. But before pulling go to Bosch Tools website and downloading a breakdown of your saw. Let me know if I can help
Posted on Jan 15, 2009
It sounds like the armature has developed an open commutator bar. What did the brushes look like that you took out. But before I assume the worst I would unplug the tool and remove both brushes and with a flas light look into the brush tube while slowly rotating the armature looking for a discoloration or raised bar. If not you might bet by with cleaning the commutator with a special stone for this, you might be able to get one at the repair shop where you bought the brushes. If you want to send me the photo of the arcing it might help on my end. Let me know
Posted on Mar 09, 2009
I found that the remaining problem was a intermittent at the switch, which disassembly and cleaning resolved.
Tilting the motor / blade assembly down allows access from below, to the 3 screws fastening the controller circuit board cover on the brush end of the motor. From there, one can easily test exposed wires for power supply, see that brushes are contacting and clean accumulated sawdust.
Posted on Jan 07, 2010
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