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: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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