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How come dremeling ruins an edge but sanding doesn't? When I polish at 5000rpm with a felt wheel or tip, the blade feels much cooler than when I sand it for example. It doesn't even heat up at all...

Just wondering, how did can one ruin a blade with a dremel aside from chipping the edge? I've caused a massive chip in one of my razors, but want to know if there's anything else I need to be careful...