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A belt sander would be unwieldy.
A belt sander would be unwieldy.
Yes, the traditional handheld belt sanders that most people think of when they hear "belt sander" would certainly be unwieldy for such an application.
But again, there are stationary belt sanders and disc sanders where in this case you would bring the coin to the tool, not the tool to the coin. For instance:

Now that I think about it, I like the disc sander with a low grit based on the wear markings on the face. Machining it on a lathe should give a much smoother surface.



















