Brand New Blade Dull
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    Brand New Blade Dull

    I have a x300 and just received two new blades. I can press my thumb on the "sharp" side and rub it up and down hard, and it won't even come close to causing any discomfort - let alone cut into it. I suspect it would even have a hard time with an carrot.

    What's up with that? How easily should the blade be able to cut a carrot?
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    Quote Originally Posted by konakid View Post
    I have a x300 and just received two new blades. I can press my thumb on the "sharp" side and rub it up and down hard, and it won't even come close to causing any discomfort - let alone cut into it. I suspect it would even have a hard time with an carrot.

    What's up with that? How easily should the blade be able to cut a carrot?
    I believe the spec on their new blades is about a 1/16 flat edge. The thought is they will be a bit tougher if a hard object is hit.
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    Your blades are just as they should be.

    Click image for larger version. 

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    Dimension “B” should be 1/64”.
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    Probably wrong, but I sharpen to a sharp edge The sharper the better it my motto
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    Quote Originally Posted by Zebrafive View Post
    Probably wrong, but I sharpen to a sharp edge The sharper the better it my motto
    I do the same thing. I've been told to leave them a little dull, but there's something about mowing with really sharp blades that leaves you with a good feeling.
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    I always grind my blades sharp also, but after the first mowing the sharp edge is gone.
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    Quote Originally Posted by ChrisR View Post
    I always grind my blades sharp also, but after the first mowing the sharp edge is gone.
    That’s just it. If you sharpen youy blades to a knife edge they will be dull within minutes and will require sharpening way too often. Then when you are constantly sharpening you are removing material and they need to be balanced more often.

    The graphic I posted above is right out of a Deere mower manual.
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    Quote Originally Posted by coaltrain View Post
    That’s just it. If you sharpen youy blades to a knife edge they will be dull within minutes and will require sharpening way too often. Then when you are constantly sharpening you are removing material and they need to be balanced more often.

    The graphic I posted above is right out of a Deere mower manual.
    You're right. Sometimes old habits die hard.
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    I have a couple sets of blades for my X500 so that I can easily rotate them and always have a set ready. All of the blade sets I purchased from JD were razor sharp right out of the box.

    I think a lot of it has to do with how much debris you run over while mowing.

    I always keep a pretty fine edge on my blades. I don't find that it makes them dull any quicker and they certainly cut better. When mulching leaves in the fall sharp blades work MUCH better. I sharpen my blades twice a season and it usually only involves a bit of a touch up with a flap disc, no deep grinding needed.
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    Quote Originally Posted by coaltrain View Post
    Your blades are just as they should be.



    Dimension “B” should be 1/64”.
    You know, all this talk about keeping your blades a bit dull. It is true that the graphic above appears in the manual. But... it is also accompanied by these instructions:

    • Keep original bevel (A) when grinding.
    Blade should have 0.40 mm (1/64 in.) cutting edge (B) or less.
    • Balance blades before installing.


    Note the "or less" part? They are saying the DULLEST it should be is 1/64" (0.015). These are blades for grass, not brush hogging. :-)



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