my excellent carpenter brother...
showed me how you take a belt sander with a fine cloth on it...
and clamp it upside down in the vise ...then at a fairly low speed
he'd touch up his chisels holding the chisel to the curve of belt sander
he'd hollow out some meat and get an extra sharp chisel every time.
Be careful here. Turning tools cut better when ground flat, not hollow ground with a secondary bevel like a woodworking chisel. Using a belt sander to sharpen tools works, but also be careful about hot metal sparks and dust piles.
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