Fritzed head tube ??

Discussion in 'The Workshop' started by Keith B, Oct 29, 2007.

  1. Keith B

    Keith B Professional Lion Tamer

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    I'm forcing crazy glue into the crack as we speak, its not a problem...no need to panic....awwww piss it looks worse in the pics!
     
  2. foofighter

    foofighter Ride More Talk Less

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    JB WELD! does it all :)
     
  3. Code Blue

    Code Blue Guest

    Remember

    your old friend and replace it. That thing is an accident waiting to happen#-o
     
  4. CalEpic

    CalEpic member

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    It's toast IMO.

    You could go through a huge pain in the ass to try and fix it if there is a sentimental attachment, (and worry about it every time you rode it) otherwise I'd clean it up and hang it on the wall over your couch as art.

    According to Columbus website, those tubes do need to be heat treated after welding.

    C
     
  5. sauce

    sauce New Member

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    i think you should make dave hinde give you a new one :)
     
  6. RacinJason

    RacinJason Banned

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    HUGH Is the man.

    I bet he can fix it .
     
  7. Keith B

    Keith B Professional Lion Tamer

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    Another one bites the dust. There'll either be another sell off coming or maybe a steel replacement. Thanks for everyones thoughts & opinions :)

    .........Although I'll PM Hugh to hear his thoughts....
     
  8. SAR_boats

    SAR_boats Booze Bikes n Boomsticks

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    The alloy 7000, used by Columbus for the tube sets Metal Altec2 Plus, Zonal and Airplane, is defined as self-tempering: it is air-hardened. This means that in the areas overheated by the welding the supersaturated structure is restored, which, owing to the natural ageing (which takes place at ambient temperature), allows for a 75% recovery of the initial properties after a lapse of time of about 3 weeks.

    Columbus does recommend precipitate oven tempering and aging for the tubes however in this case since the tubes developed stress fractures in them air hardening may be the better choice because the finished product may be less brittle.

    However, if the original frame was not tempered correctly in the first place then problems like this can also happen. So it is really anyones guess, however getting a machine shop to do all the work to fix the cracks and heat treat the frame and then paint it is going to be pricey

    But yes you are right as usual, Craig
     
  9. Keith B

    Keith B Professional Lion Tamer

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    Columbus do some fascinating post heat treating of their alloys - check out the process for their top of the line Starship material! A medium size MTB frame weighs in at 1kg (2.2lbs) superior properties to Scandium too. Now that would be a nice frame to turn SS!
     
  10. Pho'dUp

    Pho'dUp Spam Musubi MasherSS

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    Bummer Keith but not worth it dude. That's a lot of trouble to fix for no guarantees. I think Sauce likes your smile the way it is.
     
  11. RacinJason

    RacinJason Banned

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    It might be time for the new Chumba 29er

    If you cant get your bike fixed I can hook you up.
    Thats if you want a Chumba 29er, XCL Or EVO.

     
  12. Keith B

    Keith B Professional Lion Tamer

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    At the moment its either pick up a Zion for 200notes or sell the parts up to put toward an XC bike to go with my Enduro - but ta for the offer old boy :)

     
  13. RacinJason

    RacinJason Banned

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    ?

    XC bike as in bike that weighs less than 26 lbs?
    The XCL can handle XC racing with the right build kit.

     
  14. Schecky

    Schecky SoCalMTBubbs

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    Sounds like it may be time to do the humane thing and shoot that horse.
     
  15. Code Blue

    Code Blue Guest

    ahhhh


    you said that word..............STEEL BABY!!!:bang::bang:
     
  16. HUGH

    HUGH Mashers Only !!

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    Have not forgotten about this thread! I weld 7000 series aluminum aircraft parts all the time but they are not strucural in nature. I'm trying to find out the strength of the metal after welding with and without heat treating. If its close it could be done. My advice.... A Ti frame would make a great replacement! A MOOTS would be nice:?:

    HUGH
    :)
     
  17. Hanzo

    Hanzo .

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    This is the second time I have seen this problem with this headset. TC3 on mtbr had the same problem with his headtube cracking but he had an Intense 6.6 and they replaced it. N10sguy aka Marv(Intense mgmt) stated that the OD of the CC headset varied but were on the big side. I know this doesnt help you because you have a euro bike, but it may give you an idea on why. TC3 took down the pictures but it looked very similar to yours.

    linky
    http://forums.mtbr.com/showthread.php?p=1633385&page=2&highlight=cane+creek+6.6
     
  18. HUGH

    HUGH Mashers Only !!

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    Checked on this quite a bit. I won't get into the techno mumbo jumbo but I say not to weld it! It will not be safe. Now if it were my own personal frame:?:...

    HUGH
    :)
     
  19. thephat

    thephat Active Member

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    Check out On One

    Look at on one fames on the bti site. You may like the style. I heard you know somone w/ a connection to a bti account.

    BTW I think the crack on the head tube would be enough for me to call the frame a loss.
     
  20. Kid A

    Kid A now with 40% more bacon

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    nice...baby got crack. looks to me like "she's dead jim".
     

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