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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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