I actually do about the exact same thing using a 220 belt and then a worn 400 belt. I grind the edge on the slack and then put it on the buffer or paper wheel to remove the burr. I just can't get the burr to come off all of the way. There is a micro burr left and while it will get very sharp if I use light enough pressure, as soon as I cut even the softest of material it flips the wire edge to one side almost as if the steel is soft.
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