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Now that is a good idea! Or if you had a spindle sander, or vertical disk sander.... just make a fence for it.

HUGE resistance. Sanding is a very heavy application... for example, our 36" x 72" wide-belt requires a 30-horse 3-phase that draws god-only-knows how many amps... and it can only take about 1/32...

The problem you're going to run in to here is with torque... it takes a lot of it to sand off anything more than a hairsbreadth of material, or buff, etc.