Do you sharpen new blades?

Discussion in 'Lawn Mowing' started by johnwright238, May 28, 2012.

  1. Darryl G

    Darryl G LawnSite Fanatic
    Posts: 8,033

    It says here to sharpen at a 45 degree angle. I'm sure you all know that eHow is the authority on how to do virtually anything and they're always right ;

    I'm just having a hard time following how to do step 6, balancing the blade, since step 5 was to re-attach the blade to the mower!

    http://www.ehow.com/how_2058792_sharpen-lawn-mower-blade.html
     
  2. johnwright238

    johnwright238 LawnSite Member
    Posts: 226

    I tested different blades today. Here's what I came up with:
    1) I could not tell a difference in the cut quality of balanced 40 degree vs balanced 30 degree. Not even in the sound of the engine. (Briggs Pro 8.75 with heavy flywheel.)
    2) After 30 minutes of sticks and light gravel the 40 degree blade was still in good shape. The 30 degree blade showed signs of wear and tear and needs to be re sharpened. However, still no apparent cut quality difference...just noticeable vibration on the 30 degree blade now that is out of balance.
    The new blade IS out of balance but still no quality in performance.
    CONCLUSION:
    -New blades need balanced not sharpened.
    -40 degree edge lasts longer and cuts just fine on then average lawn.
    -30 degree should cut better in thick stuff and is better on spindles and/or engine but won't out last a 40 degree edge.
    let me know if you guys want pics with a more in depth review of my redneck blade experiment.
     
  3. Darryl G

    Darryl G LawnSite Fanatic
    Posts: 8,033

    How am I to balance my news blades without sharpening them? Do you gots some little thingys you stick on them like for automobile tires?

    Interesting experiment. I wouldn't think the little nicks would throw it out of balance so much that you'd have noticeable vibration. I wouldn't mind seeing the details of your experiment. Ummm....do you often mow sticks and light gravel, or was this just for the experiment?
     

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