Question about Dremel Variable - Speed Multipro Rotary Tool 395
Was using this tool to help my son make his pinewood derby car. Appears that I 'burnt it out', though don't ask me how I overused it (was just sanding balsa wood).
the unit just stopped working and quit. thought there might have been some internal fuse or heat sensor that automatically shut it off ... didn't appear to be one.
have read other people's descriptions and 'popped the hood' on it to see if I could spot anything amiss. aside from a little fine sawdust, nothing. I put a vaccuum attachment to it, just to make sure sawdust wasn't preventing electrical contact, then reassembled.
got nothing ... not even a click.
thought my problem might be "brushes", per other people's descriptions, but don't know what brushes look like.
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
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