Quote:
Originally Posted by rusnak
Not sure what you mean by that. You'd have to heat the knife to a white hot 1000F to re-temper it, and at least 200F to anneal it. And to sharpen a knife, you are not adding material, you are taking it away. Even with a stone. In the manufacturing process, the grinding is done on a machine with a belt, and then finished on a rotating stone wheel.
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Great vid and it's interesting that they use a piece of foam sponge to test sharpness.