I have been using the harbor freight $19 grinder and 24 grit burned one up with the dust. its the dust in the motor that kills them.
also take out what you can in big chunks using air chisles and crow bars.
With the shop vac's get the paper bags that go in the vac (like the one mom buy's) so the dust doesent get blown around.
Also I have found a box fan blowing on me upstream of the grinding area, I find it keeps alot of the glass dust off me as I grind. read less iching.
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