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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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