It's called "disk rolling" and is common in the midwest. They have a machine with rollers that pinch the edge of the blade as it turns it to work the metal to a sharper edge. Main selling point is that they don't remove any metal from the blade like a grinder would.
It works very well but maybe that operator made the edge too thin and sharp or had metal that was too brittle.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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