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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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