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Thread: Bent axle?

  1. #1
    Join Date
    Dec 2017
    Location
    Syracuse,NY
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    17

    Bent axle?

    Looking for advise and ideas....

    I recently purchased a runout gauge and was checking my axle for straightness. I took a measurement at each end and in the middle. One side varied .005, the other .004 and the middle .002. Visually you can't see this variation but it isn't perfectly straight either. Would you consider this bent, or at least bent enough to warrant straightening?

  2. #2
    Join Date
    Oct 2013
    Location
    King, NC
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    3,102
    I wouldn't consider that bent. I would consider it "straight" as longs as it's below perceptible tire wobble while rotating...
    Or, place it on a surface plate and roll (or billiard slate...) I'd like to find a local straightening service, myself....

  3. #3
    Join Date
    Oct 2013
    Location
    Poland
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    4,912
    Quote Originally Posted by mtbikerbob View Post
    Looking for advise and ideas....

    I recently purchased a runout gauge and was checking my axle for straightness. I took a measurement at each end and in the middle. One side varied .005, the other .004 and the middle .002. Visually you can't see this variation but it isn't perfectly straight either. Would you consider this bent, or at least bent enough to warrant straightening?
    I can't imagine how your measuring it? Are you checking it while it's in the kart? I think, meaning I'm not positive about it, it might be perfectly straight and your measuring wear in the bearings? ... as I said up front I can't think of how your accurately measuring to come up with those numbers. It's probably just me not seeing it. ...

  4. #4
    Join Date
    Oct 2013
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    1,270
    Many things can go wrong when straightening an axle. I go for .005" or less so I think it's ok. If you're measuring with the axle on the kart you could easily be measuring the bearing slop. How did you intend on doing the straightening and how soft is the axle?

    Sundog

  5. #5
    Join Date
    Oct 2013
    Location
    iowa
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    6,529
    Agreed ; your technique could be off that much or your equipment.
    You know its bent when the wheel wobbles .

  6. #6
    Join Date
    Dec 2017
    Location
    Syracuse,NY
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    17
    Good info....I was getting one side wobbling while on the stand, and assumed the axle must be bent a little. I used a runout gauge while on the kart. I marked the high and low spots on the axle and they were about 180* from each other. The amount of variation doesn't seem possible to make the wobble so maybe the hub is bent?

    I would let someone else do the straightening.

  7. #7
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    Oct 2013
    Location
    iowa
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    Wheels can bend also .
    Or hub.

  8. #8
    Join Date
    Apr 2016
    Posts
    292
    Axle straightening located in Indianapolis Indiana Bill 317-491-8751 Starting at $ 30.00 plus shipping most axles, Been doing it for long time also straighten chassis and steering shafts Thanks

  9. #9
    Join Date
    Sep 2016
    Posts
    326
    Quote Originally Posted by BMB View Post
    Axle straightening located in Indianapolis Indiana Bill 317-491-8751 Starting at $ 30.00 plus shipping most axles, Been doing it for long time also straighten chassis and steering shafts Thanks
    Do you guys straighten out chassis the ol' fashion way? With one man jumping on a wheel and eye-balling it for straightness? Hahaha, JK. I have a chassis that is bent in the front too and would love to have someone near me who can straighten a chassis the right way, but I suppose I will have to resort to the ol' fashion way. :P

  10. #10
    Join Date
    Apr 2016
    Posts
    292
    I have a 2500# steel plate table. Do it with lasers and height gauges been doing it for a long time. Bill 317-491-8751 Where you located?

  11. #11
    Join Date
    Oct 2013
    Location
    King, NC
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    3,102
    Bill - metric and english axles? I have a 40mm that needs tweaked back...

  12. #12
    Join Date
    Apr 2016
    Posts
    292
    American or metric do them all sent PM thanks

  13. #13
    Join Date
    Oct 2013
    Location
    Mentor, Ohio
    Posts
    796
    Under .010 will not be noticeable while driving or show in performance. I've seen guys win oval races with axles almost bouncing but I wouldn't recommend it

  14. #14
    Join Date
    Oct 2013
    Location
    North East Florida
    Posts
    226
    Comet Kart Sales has done an awesome job on straightening a bunch of our 40mm's

  15. #15
    Join Date
    Mar 2016
    Posts
    403
    If you have a bearing that has even .001 of play you need to replace it. It's crazy how important bearings are to a kart but yet people know so little about them.

  16. #16
    Join Date
    Oct 2013
    Location
    Greenville, SC
    Posts
    2,294
    I do remember straightening a bent axle back in Europe and drive 300 miles for a practice day, and 1st lap in the chicane I saw my rear left tire/wheel passing me with a piece of the axle. I sounds fun now but wasn't back then. lol.

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