How to build girder???

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by rustycase, Mar 24, 2012.

  1. rustycase

    rustycase Gutter Rider

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    I can't quite figger how to fab these girder fork tubes...
    How were they made?
    any suggestions?

    ...for a 26" cruiser bicycle scale...

    I was thinking, perhaps, of using muffler tubing and crushing it to oval in a press, then making a V cut, a short one at the top, and musch longer one at the bottom, closing up the V, then welding up... then all the other brackets and stuff...

    kind of a lotta work!

    But i really like th look of the chief girders! lol
     

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  2. Ibedayank

    Ibedayank New Member

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    a true girder fork uses small tubing
    also need the ability to install bushings and bearings at pivot and wear points

    if needed I an get pics of a real motorcycle girder forks for ya
     
  3. killercanuck

    killercanuck New Member

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    cool Rusty, those'll be solid for sure.

    heck yea Mr.Yank, if you have a pic handy eh? :)
     
  4. thegnu

    thegnu New Member

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    heres a girder
     

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  5. rustycase

    rustycase Gutter Rider

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    That's beautiful, Gnu, but I really like the Chief single tube girder look, and want to learn how it's made.
    ...or How I can make one like it for motorized bicycle service...

    Best
    rc
     
  6. thegnu

    thegnu New Member

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    why not split a hunk of tubing in half length wise make wedges for the sides to fit your desired taper ?
     
  7. rustycase

    rustycase Gutter Rider

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    OK... hadn't thought of adding a center piece yet.
    That might be the ticket!
    Tnx
    rc
     
  8. thegnu

    thegnu New Member

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    N.p. RC , or fab it from solid bar stock , but that may be reeeealy heavy .
     
  9. rustycase

    rustycase Gutter Rider

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    nah, couldn't do that... I've seen where guys flame cut some rather long girders from flat stock on REAL motorcycles, and that's not something I want to do.

    I probably should get the fittings so I can get my plasma cutter functioning properly, though.
    I've only used it to test the function.. and made a real mess, but the machine worked as it should!

    Tnx
    rc
     

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