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  • pickup truck crane woes...

    Good day all...

    Am in the process of making a crane to mount in the back of a pickup truck... I'm using 3.5" x 1/4" pipe for the mounted piece and of course a 4" x 1/4" to slide over and swivel on it...

    The problem is the 4" pipe isn't seamless... Anyone know of some process besides getting a piece of seamless pipe to get the seam out of about 3 feet of that 4" pipe ???

    thanks
    r00n
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  • #2
    I can't think of any. Seamless comes from the DOM ( drawn over mandrel ) as opposed to the normal rolled pipe. If you need one tube to fit inside the other that another specialized product. The dimensions are different than standard pipe.
    Dennis


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    • #3
      talk to ur steel supplier and find some with close tolerances.
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      • #4
        Originally posted by r00n View Post
        Good day all...

        Am in the process of making a crane to mount in the back of a pickup truck... I'm using 3.5" x 1/4" pipe for the mounted piece and of course a 4" x 1/4" to slide over and swivel on it...

        The problem is the 4" pipe isn't seamless... Anyone know of some process besides getting a piece of seamless pipe to get the seam out of about 3 feet of that 4" pipe ???

        thanks
        r00n
        What type of crane are you getting or using, I'm thinking of adding one to the back of my 1 ton.

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        • #5
          Instead of using pipe with 0 tolerance fit, you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one, this will also reduce friction when you swivel it with a load on.
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          • #6
            Originally posted by burninbriar View Post
            Instead of using pipe with 0 tolerance fit, you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one, this will also reduce friction when you swivel it with a load on.
            Or do what I did with my jib crane and insert roller bearings top and bottom into a 1/4" tube and a T-1 matching shaft in the center. Or I was thinking find a shaft and outer case with close tolerances and tap in a couple of grease nipples. It would turn easy & never corrode.

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            • #7
              Originally posted by burninbriar View Post
              you could use pipe sizes with a looser fit and install shims at the ends of the larger piece to tighten the fit on the smaller one.
              I do this on my trailer ball receivers (male end) to keep the dang things from rattling. You can make it as snug as you want.
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