How much to sharpen on a blade?

Discussion in 'Lawn Mowing' started by jeffreyj77, May 9, 2005.

  1. jeffreyj77

    jeffreyj77 LawnSite Member
    Posts: 37

    I was wondering which performs better?

    1) A blade that has only the outside 3-4" sharpened

    or

    2) A blade that is sharpened all the way from the tip to the center?

    Didn't know if anyone has ever investigated this before!

    Thanks!
     
  2. Pecker

    Pecker LawnSite Bronze Member
    Posts: 1,454

    I sharpen every part that was sharpened when it was new. Of course, I use mulching blades so there are two parts to sharpen.
     
  3. KathysLGC

    KathysLGC LawnSite Bronze Member
    Posts: 1,345

    I would have to say for mulching you would want a longer edge but for regular discharging it shouldn't make much of a difference. I did a test for myself and sharpened my blades with the long edge, cut my lawn (with out hitting any sticks/roots) then took the blades off to see the condition of the edge. The first 2-3 inches had the most wear but down to about 4-5-6 inches of the edge showed signs of it cutting as well but not nearly as much as the tip of the blade. I would assume the longer edge also helps when going fast by reducing clippings a bit more.
    I did this test because i had the same question only I have a blade sharpener and a bunch of blades. BTW I did this test on my 48" TTHP so it was done with 16" blades.
     
  4. Davis Lawn Mowing LLC

    Davis Lawn Mowing LLC LawnSite Senior Member
    Posts: 318

    I do the same as ******, sharpen just like it was when it was new. Hell, just went and bought a set of blades today for $92.00 for my Cub ZTR. Must be going up, they were $82.00 last year.
     
  5. aclassic

    aclassic LawnSite Member
    Posts: 181

    seeing as how mower blades are made of steel and the price of steel has gone up, then it makes sense. pretty simple
     
  6. vipermanz

    vipermanz LawnSite Bronze Member
    Posts: 1,773

    how many did you buy?? thats $30+ per blade
     
  7. Jackman

    Jackman LawnSite Member
    from Zone
    Posts: 231


    For 92 dollars I hope he got more than 3 blades,,,,,,,, for my Lazer Z 92 dollars would get me 8 Excaliber OEM blades.......
     
  8. Runner

    Runner LawnSite Fanatic
    Posts: 13,494

    Matt, PLEASE tell me you were kidding about the 90 dollars for a set of blades!

    As far as the question about the length of the edge, I believe the longer edge is going to have a few advantages, first, though it is no alot, there IS more cutting edge there. Now, just because there is say, for instance 30% more, that doesn't mean you're going to have 30% more mulching capability. The reason is, that as you get further into the center of the blade, you are losing speed. One BIG advantage of the long sharpening is though, is resistance. With a long sharpened bevel, there is no question that it will spin easier than a blunt thickness of a blade. I believe This can and does make a significant difference.
     
  9. Appalachian landscape

    Appalachian landscape LawnSite Senior Member
    Posts: 453

    my exmark oem blades cost $11.11 each at the dealer.
     
  10. lqmustang

    lqmustang LawnSite Senior Member
    Posts: 620

    I don't think he is kidding on the blade price. I was quoted $26 each for factory Scag hi-lifts. I am presently trying a set of hi-lifts that I bought off mowtownusa on ebay for $7.50 each. So far, so good.
     

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