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  1. #11
    Silver Member
    Join Date
    Jun 2005
    Posts
    138
    Location
    Saskatoon, SK, Canada
    Tractor
    John Deere 2210

    Default Re: how to cut metal tubing angles

    Deerlope what do you mean a roll bar should never be welded? He wants to make a roll cage. Virtually all racing roll cages are weled. And I mean ALOT of welds. Next time you are around a drag car, stock car, dirt track car, etc have a look at the roll cage. There is welding on those that takes days and days to complete. I've watched drivers walk away from 200 + MPH crashes because of those welded cages.

  2. #12
    Veteran Member
    Join Date
    Jul 2005
    Posts
    1,470
    Location
    Georgia
    Tractor
    YM2000

    Default Re: how to cut metal tubing angles

    I believe he means the actual main loop. The braces prety much have to be welded.. Though the weld is strong, the process might weaken the metal around it. I'm not a welder, but I have been told this before. Plus I've spent some time in a Holiday Inn Express [img]/forums/images/graemlins/grin.gif[/img] [img]/forums/images/graemlins/grin.gif[/img].

  3. #13
    Silver Member
    Join Date
    Jun 2005
    Posts
    138
    Location
    Saskatoon, SK, Canada
    Tractor
    John Deere 2210

    Default Re: how to cut metal tubing angles

    A cage on a tractor is going to be a relatively thick walled mild steel. If a guy can weld reasonably well it's gonna be tough to weaken any surrounding metal. Now if fatigue conditions, material alloy or heat treating were issues of concern it would be another matter. Weld away.

  4. #14
    Veteran Member
    Join Date
    Jul 2005
    Posts
    1,924
    Location
    NH seacoast & Coos County
    Tractor
    Kioti DK45S

    Default Re: how to cut metal tubing angles

    Isn't saying "a roll bar should never be welded" kind of like saying it's illegal to remove the tag from a mattress? Obviously anything that weakens the bar increases risk of injury but welding doesn't necessarily weaken. With any engineered system modification changes the basis for the design but doesn't always detract from it. Sorry to pick on anyone but "never" is a long time. 99.9% of the tractors ever built never needed a ROPS. Just like 99.9% of automotive airbags go to the junk yard intact. Just be grown up enough to understand, minimize, accept the risk associated with your modifications. That's how man stood on the moon.

  5. #15
    Veteran Member RedRocker's Avatar
    Join Date
    Apr 2004
    Posts
    2,115
    Location
    Lewisville & Montague County, TX
    Tractor
    Kioti CK30 HST, dual remotes, FEL.

    Default Re: how to cut metal tubing angles

    Most welding supply houses have a clamp on or wrap around pattern you can put on tube and pipe to mark the notch for cutting. An inexpensive method is one of those hole saw fixtures that cope tubeing. If you know what you're doing, it's OK to weld on your roll bar. Here's what I did to mine.
    Attached Images Attached Images

  6. #16
    Banned HomeBrew2's Avatar
    Join Date
    Dec 2004
    Posts
    1,896
    Location
    Dunlap, CA
    Tractor
    Kubota BX23

    Default Re: how to cut metal tubing angles

    Just found a little app for printing your own templates: www.damonrinard.com/tubemiter.exe. (I did not make it a hotlink due to the fact that it's an exe file. Use appropriate caution. I had no probs.)
    It is way too cool!
    Cheers!
    Attached Images Attached Images

  7. #17
    Banned HomeBrew2's Avatar
    Join Date
    Dec 2004
    Posts
    1,896
    Location
    Dunlap, CA
    Tractor
    Kubota BX23

    Default Re: how to cut metal tubing angles

    ok, it got posted as a hotlink anyway, whatever ...

  8. #18
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,201
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: how to cut metal tubing angles

    For the tube miter go to this site and then look at the bottom of the page.

  9. #19
    Super Member JerryG's Avatar
    Join Date
    Apr 2000
    Posts
    7,201
    Location
    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: how to cut metal tubing angles

    BTW, thank for the link. I did have that little program and used it several times until I had a hard drive crash and lost it.

  10. #20
    Banned HomeBrew2's Avatar
    Join Date
    Dec 2004
    Posts
    1,896
    Location
    Dunlap, CA
    Tractor
    Kubota BX23

    Default Re: how to cut metal tubing angles

    Thanks, Jerry, and you're welcome. Also copying and pasting my [dead] link gets you to it directly which was my original intension.

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