Mower wobbles after blade hits rock.

Discussion in 'Home Repair' started by Tim Zimmerman, Feb 16, 2005.

  1. My Black&Decker electric mower was loan to friend. He ran the
    mower over several boulders several times, chipping a couple
    pearl size sections off the blade. Possibly, this is causing the mover
    to vibrate to the point of causing a shoulder sore.

    I remove the blade, then clamp it to a vise grip. I have an angle
    grinder that I will use to fix the balancing problem. The problem is,
    I've never done this before. What is a practical way to balance a
    mower blade?

    Thanks
     
    Tim Zimmerman, Feb 16, 2005
    #1
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  2. Tim Zimmerman

    Bo Williams Guest

    Tim Zimmerman wrote:
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?


    For "pearl size sections" missing, don't even try to balance it. Just
    replace it. Balancing a blade makes sense for normal wear; it's not
    indicated for acute damage.
    --
    Bo Williams -
    http://hiwaay.net/~williams/
     
    Bo Williams, Feb 16, 2005
    #2
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  3. I use an old knife blade clamped in the jaws of a vise. I then balance
    the blade with the knife edge running across the center of the hole. Grind
    the edges to balance. You will never get the blade to sit stationary but
    you will see which end is heavy. If the mower is shaking enough to feel in
    your shoulders I suspect that the motor shaft is bent.
    Randy

    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    Randy Zimmerman, Feb 16, 2005
    #3
  4. Tim Zimmerman

    TT Guest

    Sears and other places that sell mowers will sell a small cone shaped device
    on which you position the mower blade before and after grinding to determine
    if it's balanced, probably not more than $5 I would guess.

    -Tom


    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    TT, Feb 16, 2005
    #4
  5. Tim Zimmerman

    bw Guest

    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?


    You should not run the blade with that much damage.
    Get a new blade, send the bill to your friend.
     
    bw, Feb 16, 2005
    #5
  6. Tim Zimmerman

    OldNick Guest

    On Wed, 16 Feb 2005 03:53:13 GMT, "Tim Zimmerman" <>
    vaguely proposed a theory
    .......and in reply I say!:

    remove ns from my header address to reply via email

    Get your "friend" to replace it! Jeezers nose!

    >My Black&Decker electric mower was loan to friend. He ran the
    >mower over several boulders several times, chipping a couple
    >pearl size sections off the blade. Possibly, this is causing the mover
    >to vibrate to the point of causing a shoulder sore.
    >
    >I remove the blade, then clamp it to a vise grip. I have an angle
    >grinder that I will use to fix the balancing problem. The problem is,
    >I've never done this before. What is a practical way to balance a
    >mower blade?
    >
    >Thanks
    >
    >
    >
     
    OldNick, Feb 16, 2005
    #6
  7. Tim Zimmerman

    TURTLE Guest

    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >


    This is Turtle.

    I take the blade off and bring it with me to Walmarts and go to the lawn mower
    area and match it up and get a new one for $9.95 and come back and put it on.
    Tring to balance a blade on a lawn mower with chunks missing is right next to
    impossible.

    Now like Randy said it might be a bent shaft on the motor.

    TURTLE
     
    TURTLE, Feb 16, 2005
    #7
  8. Tim Zimmerman wrote:
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >

    Don't know how big "pearl size" is since pearls
    come in a lot of different sizes. You're going to
    have to do a lot of grinding to get it in good
    shape and balanced.

    To balance it, just clamp a six or eight penny
    nail in a vice (horizontal) with about 3/4"
    sticking out. Or, pound the nail into anything
    and stick the center hole of the blade on it. You
    can get fancier but a nail works. Set the blade
    slightly off horizontal and grind until the side
    that is down always swings down (try each side
    slightly below horizontal).

    Finally, you may have a worse problem than just
    chips in the blade -- the crank shaft may be
    slightly bent. Be sure you get the blade balanced
    well, because you need a balanced blade to tell if
    the crankshaft was bent.
     
    George E. Cawthon, Feb 16, 2005
    #8
  9. Tim Zimmerman

    Phisherman Guest

    On Wed, 16 Feb 2005 03:53:13 GMT, "Tim Zimmerman" <>
    wrote:

    >My Black&Decker electric mower was loan to friend. He ran the
    >mower over several boulders several times, chipping a couple
    >pearl size sections off the blade. Possibly, this is causing the mover
    >to vibrate to the point of causing a shoulder sore.
    >
    >I remove the blade, then clamp it to a vise grip. I have an angle
    >grinder that I will use to fix the balancing problem. The problem is,
    >I've never done this before. What is a practical way to balance a
    >mower blade?
    >
    >Thanks
    >


    Your mistake was loaning the mower. Your "friend" owes you a new one,
    or at the very least should take it in for repair. You may have a
    bent shaft and in that case the mower is trashed.

    You can buy a balancing cone made specifically for mower blades.
    These work well. Or, you can use the shaft of a screwdriver to
    balance it, but the cone works better.
     
    Phisherman, Feb 16, 2005
    #9
  10. Tim Zimmerman

    John McGaw Guest

    Tim Zimmerman wrote:
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >

    If it is a serious wobble I'll put my money on a bent motor shaft rather
    than an unbalanced blade. I have a battery-powered electric sold by
    Sears but IIRC made by B&D and hitting a tree root with it left me with
    a bend in the motor shaft which was unrepairable leaving me to replace a
    very expensive motor. I'm a lot more careful now...
    --
    John McGaw
    [Knoxville, TN, USA]
    http://johnmcgaw.com
     
    John McGaw, Feb 16, 2005
    #10
  11. Tim Zimmerman

    twfsa Guest

    Buy a new blade and give the bill to your friend.

    Tom


    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    twfsa, Feb 16, 2005
    #11
  12. Tim Zimmerman

    xrongor Guest

    i felt the need to hear myself talk so i decided to add nothing to this
    conversation like the other 20 people before me.

    nice fishing tim.

    randy

    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    xrongor, Feb 16, 2005
    #12
  13. In article <JszQd.417$>,
    Tim Zimmerman <> wrote:
    >My Black&Decker electric mower was loan to friend. He ran the
    >mower over several boulders several times, chipping a couple
    >pearl size sections off the blade. Possibly, this is causing the mover
    >to vibrate to the point of causing a shoulder sore.
    >
    >I remove the blade, then clamp it to a vise grip. I have an angle
    >grinder that I will use to fix the balancing problem. The problem is,
    >I've never done this before. What is a practical way to balance a
    >mower blade?
    >
    >Thanks
    >
    >
    >
    >


    You can test the balance by hanging the blade from a nail or string
    and grinding as necessary, but if it has the chips you say, it
    wouldn't be out of line for your friend to buy you a new blade.


    --

    Larry Wasserman Baltimore, Maryland
     
    Lawrence Wasserman, Feb 16, 2005
    #13
  14. Replace the blade. A blade that has been that badly abused may have had
    its integrity compromised. You can bank on that blade being severly
    weakened. If you try to balance it and use it, you are running the risk of
    a catastrophic blade failure in the future, which means that it is possible
    that chunks of metal could come flying out from underneath the mower.
    It is possible that the shaft is bent; however, some lawn mower engines
    have small aluminum 'keys' that sit in slots machined into the shaft (or at
    least where there is a mechanical connection between the shaft and the
    engine). These are designed to fail if the blade strikes something hard.
    It happened to me once. I hit a metal culvert and the mower stopped dead
    and would not restart. Once the keys were replaced, everything was fine.


    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    Andrew Neilson, Feb 16, 2005
    #14
  15. Tim Zimmerman

    John Harlow Guest

    I thought I'd say the same thing a couple dozen other people said without
    looking at their replies and tell you to buy a new blade, the motor shaft
    could be bent and your friend should pay for it.
     
    John Harlow, Feb 16, 2005
    #15
  16. Tim Zimmerman

    Duffaukid Guest

    On Wed, 16 Feb 2005 03:53:13 GMT, "Tim Zimmerman" <>
    wrote:

    >My Black&Decker electric mower was loan to friend. He ran the
    >mower over several boulders several times, chipping a couple
    >pearl size sections off the blade. Possibly, this is causing the mover
    >to vibrate to the point of causing a shoulder sore.
    >
    >I remove the blade, then clamp it to a vise grip. I have an angle
    >grinder that I will use to fix the balancing problem. The problem is,
    >I've never done this before. What is a practical way to balance a
    >mower blade?
    >
    >Thanks


    You mean your ex- friend!

    I did that 21 years ago and I have not forgiven him yet.

    DK
     
    Duffaukid, Feb 16, 2005
    #16
  17. Tim Zimmerman

    Tom Miller Guest

    Check that the shaft isn't bent.This could save you the time spent
    balancing the blades,only to find that the shafy has been bent and it still
    "wobbles"

    "Tim Zimmerman" <> wrote in message
    news:JszQd.417$...
    > My Black&Decker electric mower was loan to friend. He ran the
    > mower over several boulders several times, chipping a couple
    > pearl size sections off the blade. Possibly, this is causing the mover
    > to vibrate to the point of causing a shoulder sore.
    >
    > I remove the blade, then clamp it to a vise grip. I have an angle
    > grinder that I will use to fix the balancing problem. The problem is,
    > I've never done this before. What is a practical way to balance a
    > mower blade?
    >
    > Thanks
    >
    >
    >
    >
     
    Tom Miller, Feb 16, 2005
    #17
  18. Tim Zimmerman

    Tom N Guest

    Randy Zimmerman wrote:

    > I use an old knife blade clamped in the jaws of a vise. I then
    > balance
    > the blade with the knife edge running across the center of the hole.
    > Grind the edges to balance. You will never get the blade to sit
    > stationary but you will see which end is heavy. If the mower is
    > shaking enough to feel in your shoulders I suspect that the motor
    > shaft is bent.


    It might be worth removing the blade and running the motor to see if it still shaking or the shaft is visibly
    wobbling. If it is, then a new or balanced blade is a waste of money and/or time.
     
    Tom N, Feb 17, 2005
    #18
  19. Tim Zimmerman

    HVAC fella Guest

    'My Black&Decker electric mower was loan to friend. He ran the mower
    over several boulders several times, chipping a couple pearl size
    sections off the blade. Possibly, this is causing the mover to vibrate
    to the point of causing a shoulder sore.
    I remove the blade, then clamp it to a vise grip. I have an angle
    grinder that I will use to fix the balancing problem. The problem is,
    I've never done this before. What is a practical way to balance a mower
    blade?
    Thanks'


    ME: The crankshaft has been damaged. Its not the blade. The mower is
    now history. See if your friend will go halves on another mower.
     
    HVAC fella, Feb 17, 2005
    #19
  20. bw wrote:
    > "Tim Zimmerman" <> wrote in message
    > news:JszQd.417$...
    >
    >>My Black&Decker electric mower was loan to friend. He ran the
    >>mower over several boulders several times, chipping a couple
    >>pearl size sections off the blade. Possibly, this is causing the mover
    >>to vibrate to the point of causing a shoulder sore.
    >>
    >>I remove the blade, then clamp it to a vise grip. I have an angle
    >>grinder that I will use to fix the balancing problem. The problem is,
    >>I've never done this before. What is a practical way to balance a
    >>mower blade?

    >


    Hate to be the bearer of bad news, but the odds are that the severe
    vibration that you are experienceing is not due to an out of ballance
    blade. When a mower hits an object like a root, or rock or other
    obstruction, it often bends the crankshaft that the blade is attached
    to. This happened to my parents Honda mower when my son ran it into a
    rock and the repair guy told us that it is a common occurance. In their
    case it required a fairly expensive repair, the replacement of the crank
    shaft AND a new blade. You can try a new blade, and maybe you will get
    lucky, but if he hit rocks numerous times, I expect that the vibration
    will still be there with the new blade. They don't make the motors on
    mowers with heavy enough parts to be mowing rocks.
     
    Littleneckhalfshell, Feb 18, 2005
    #20
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