I currently have four rough-cut rotary mowers all of which I use as HD finish mowers. Accordingly, I keep the blades sharp on all.
I've bought many replacement blades for various brands of rough-cut mowers from multiple sources. All of the replacement blades that I have bought have been "semi sharp" (1/16" or so) as purchased. Still, I sharpen to near lawn mower sharpness before installation. No, I do not hit rocks, stumps, etc., and I do not cut saplings.
Sounds like you need a new source for replacement blades.
I once spent hours sharpening the unsharpened "edge" of a slip scoop to a 45 degree or so edge. Doing so wore out a (cheap) HF 4" grinder and several wheels.
If you hit hard objects, put them on and forget about it. If you do not, get another set or spend the time to sharpen the ones that you have.
Sharp blades cut better and require a bit less HP and fuel.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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