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Thread: How to straighten a metal tube?

  1. #1
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    How to straighten a metal tube?

    I have this metal tube for my unisaw for the fence and I noticed today it is slightly bent, enough that it should be straightened. What is the best way to straighten a metal tube? Thanks

  2. #2
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    Oct 2005
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    Assuming it is flexible enough to be bent with hand pressure, I like the tube benders that look like springs to keep the cylinder round while bending a tube. It makes it very hard to put a kink into the cylinder. (but not impossible)

  3. #3
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    If it's about 1.25" diameter like I'm thinking, sounds like a job for a pair of big v-blocks and a press with a radiused bend form to prevent kinking the tube were you push on it.
    Kyle in K'zoo
    Screws are kinda like knots, if you can't use the right one, use lots of 'em.
    The greatest tragedy in life is the gruesome murder of a beautiful theory by a brutal gang of facts.

  4. #4
    Quote Originally Posted by Kyle Kraft View Post
    If it's about 1.25" diameter like I'm thinking, sounds like a job for a pair of big v-blocks and a press with a radiused bend form to prevent kinking the tube were you push on it.
    The real trick is you need to bend it slightly past straight, because it will spring back a little.
    I'm such a good good boy,
    I just need a new toy.

  5. #5
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    Depending on how important the tube is to you and what it is used for, a machine shop or welding shop may be the way to go. Straightening tubes can be an art that does not tolerate too many mistakes with out making it unusable.
    David B

  6. #6
    Not to sound rhetorical but let good enough be good enough. What often happens with things like that is people tend to want to fuss with it too much, and wind up with a mess DAMHIK . So if you do try it your self, do yourself a favor, when you get it close, be happy a leave it alone.
    I know it was here a minute ago ???

  7. #7
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    I placed the tube in a homemade jig and used an ordinary woodworkers clamp to draw the tubes as straight as I could. Not perfect but better.

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