Frame machine before/after?

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  1. Phantom440

    Phantom440 Well-Known Member

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    Hi all, quick question;
    Is a car (especially our unibodies) as strong as before after it’s been on a frame machine? We’ve all grabbed a hunk of metal and bent it back and forth enough to snap the metal off, like a paper clip.
    After it’s bent once from an accident, then bent back into spec, wouldn’t it be weaker than before?
    Thanks, and Happy New Year!
     
  2. VANDAN

    VANDAN FBBO Gold Member FBBO Gold Member

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    I would think the original "engineered" design, would be the ultimate for stock applications. If you had damage, and repair, why not just add frame ties, and rest easy after that ? The Quality of the repairs would also factor in...
     
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    • R413

      R413 Well-Known Member

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      They say it’s good. The metal has a memory and wants to go back how it was. And when a frame rail is bent the bed is very slight. But due to the length it looks like more bend than it is.
      It’s not like bending metal in half and back and forth like your example.
       
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      • 66Satellite47

        66Satellite47 FBBO Gold Member FBBO Gold Member

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        The unibody is going to be slightly weaker after a straightening. Not much I think.
         
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        • zyzzyx

          zyzzyx FBBO Gold Member FBBO Gold Member

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          It really comes down to what was bent and how bad. Once a frame or in our case
          a channel gets bent, it loses strength when pulled back out. If hit in the same
          place again it will take less force to do the same damage. Alot of the new vehicles
          are required to replace rails and panels after they have been pulled to keep the
          strength and integrity of the body. It's on a case by case basis. any pic's on the
          damage would help!
           
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          • slimt

            slimt Well-Known Member

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            It may be a little weaker. But not much. The old cars got alot of metal. Good stuff not the cheap crap like the new ones. If its pulled properly and heated and dollied out properly. It will be fine but usually anything like a rear frame rail or front rail pending how sandwiched it is may have to be replaced after all the pulling and lining up of panels has been done. Cross measuring and diamond is crucial. So theres no dog tracking. It was done back when they were new. So no different today on those. We just have better tools to do the jobs properly.
             
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            • Cncguy1

              Cncguy1 Well-Known Member

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              No more holeshots.
               
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              • Phantom440

                Phantom440 Well-Known Member

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                Sorry, my car isn't damaged (other than rust); I was just curious. I looked around online for answers and only found articles by body shops or frame machine companies who probably wouldn't admit if it weakens the metal! :)
                 
              • 66Satellite47

                66Satellite47 FBBO Gold Member FBBO Gold Member

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                My '65 Coronet suffered a slide off the track through the traps. The front frame was bent. Replaced the K member & had the frame straightened. Worked perfect. Many thousand runs after that.
                 
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                • Stanton

                  Stanton Well-Known Member

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                  A friend of mine had an Olds cutless that got severe front end damage. The frame was straightened and once they applied the bondo to the damaged area it was good as new :)
                   
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                  • Nevada dan

                    Nevada dan Well-Known Member

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                    Our b bodies are unibody
                    When repairing anything that can’t be hammered back to original cold ( meaning no heat )
                    Gets cut out to factory seams and welded back together with new or undamaged salvage parts
                    The structural integrity remains the same and bondo is never used to cover up poor work
                    It’s the same everywhere you get what you pay for if you want it done right it’s gonna cost you but you save in the long run
                     
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                    • BeatersRus

                      BeatersRus FBBO Gold Member FBBO Gold Member

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                      :rofl:
                       
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