I never sharpen them unless they are about new and hit some rocks. When the corner is worn round and you flip it over then the mower does not have as much lift. The back edge is what creates the suction on the cutter bar.
I replace mine after each cutting. It costs me less than forty dollars to mow 120 acres of alfalfa, each cutting.. Plus the new sharp knives will help keep the alfalfa crowns in better shape by them having a cleaner cut not ragged.
I feel that the cost of the knives is small compared to the lost hay if it is down and the cutter bar will not lift it. Plus if I can help the crowns regrow better then it is more tonnage the next cutting.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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