Sad times. Today I was trying out a 3d profiling job and my trusty

General CNC CNC Routers
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Sad times. Today I was trying out a 3d profiling job and my trusty rotary tool burned out. :frowning:

It suddenly dropped off to a very slow rpm. I thought maybe it was having difficulty with a cut and about to stall, but no, it was toast. Bad smell of hot electronics. No idea what has actually been damaged. Nothing super obvious to a cursory inspection, but I don’t really know what to look for.

In any case, now I have to decide. Do I switch in my dremel, buy another cheap rotary tool, or invest in a serious cnc spindle…?

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Probably the brushes. Look to the sides of that black section. Do you see largish access screw caps? Usually you can replace the brushes when they wear down.

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Problems appear because bearings rotate more hard, then appears overheat and rotor winding can burns.
Similar tools are very reliable, but repair it really hard.