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Why are Blades like this?

Discussion in 'Lawn Mowing' started by TierOneLawnCare, Aug 31, 2006.

  1. TierOneLawnCare

    TierOneLawnCare LawnSite Member
    Messages: 61

    Why are mower blades only sharp a portion of the entire blade? Wouldnt you think it wouldnt you think it would cut better with the blades sharp the entire length of the blade.....Ill demonstrate X=sharp Part Z=dull part
    here are current blades XXXZZZZOZZZZXXX Here is my proposal
    XXXXXXZOZXXXXXX by the way O= Center of the Blade........Maybe someone Could explain this better to me
  2. Idealtim

    Idealtim LawnSite Senior Member
    Messages: 939

    The only reason I could think of it that the blade edge is spining is slower toward the center. Thats why the outermost tips always dull the fastest. the inside would be spining to slow to actually cut anything. Exmark used to advertise ''excalibur'' blades that were sharpened farther in like your talking about. Hope I could help.
  3. mojob

    mojob LawnSite Senior Member
    Messages: 515

    Maybe you could explain your thread to us. Holy cow I thought it was me for a minute there.
  4. WildWest

    WildWest LawnSite Senior Member
    Messages: 384

    As you travel while mowing, you are actually only mowing with about the first 2 inches of the blade... ever notice how the sharp part of the blade closer to the center isn't as dull.

    It might help with mulching, but not much.
  5. dvmcmrhp52

    dvmcmrhp52 LawnSite Platinum Member
    from Pa.
    Messages: 4,205

    There are many types of blades out there that have an edge to just about center of the blade, apparently you just haven't come across them yet.
  6. stuffdeer

    stuffdeer LawnSite Bronze Member
    Messages: 1,617

    I always thought this was true! ^^^
  7. Dashunde

    Dashunde LawnSite Senior Member
    Messages: 638

    Humm... My blades ARE sharpend full length.
  8. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    A lot of blades these days ARE sharpened full length.

    I feel it DOES help. Especially at faster cut speeds.

    The reason the inner edge doesn't dull as bad as the tip is because it isn't spinning as fast. It also isn't usually hitting any obstructions (rocks, sticks, etc).

    Prior to full length being available for my Lazer, I would make them myself.
  9. Meg-Mo

    Meg-Mo Inactive
    Messages: 1,020

    Todays tip speed on mowers you only use less than 1" of the blade to cut the grass. With the normal 5" sharpen is plenty.
  10. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    While it's action of actually CUTTING grass under debate, A full length sharp edge also chops up your clippings further.

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