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OK, here's where I'm at with it so far. I stole Charlie's trick for tensioning the belt, but the whole thing seems a little rickety, not sure that I'm happy with it. Anyway, tomorrow I plan to add a...

Update: a box just arrived from McMaster Carr containing pulleys, a 9" drive shaft, belt, and reducer bushings for the grinding wheel. Gonna use Charlie's trick of mounting the motor on a hinged base...

Nice contraption. Do you think 600 RPM is a good speed?

So I've been thinking about making a low-RPM grinding wheel. The ones they sell at woodworking supply places are 1700 RPM, which is slower than 3500, but still much too fast.

I found this...