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  1. 7th August 2008, 08:56 PM #1
    jeremy
    jeremy is offline Novice
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    Default Sizing for one square steel section inside another

    Hi all,

    I'm looking at making some exercise equipment and part of this requires one piece of square section to slide inside another, in order to increase and decrease length.

    I was wondering what sizes and thicknesses to use for the inside and outside pieces so that the inner piece will slide inside the other without too much movement. Normally exercise equipment uses about a 50mm steel SHS.

    On a US web site, they recommended using 16gauge steel, 2 inch for outside, 1-3/4 for the inside. However it doesn't look like 45mm SHS (the equivalant to 1-3/4inch) is available in australia.

    Hopefully this is clear. Any help is appreciated,

    Thanks,
    Jeremy
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  3. 7th August 2008, 09:05 PM #2
    Calm's Avatar
    Calm
    Calm is offline Stubby Owner and proud of it. Now coming back to Earth.:D
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    Default

    It is best to go to a steel supplier. They have short off cuts that you can try to get the bits you want. Normally most sizes fit but you need to get the right wall thickness to reduce the clerance. Hope you understand.

    Goodluck and show us some pictures as you go.

    cheers
    regards

    David


    "Tell him he's dreamin."
    "How's the serenity" (from "The Castle")
  4. 7th August 2008, 09:50 PM #3
    Grahame Collins's Avatar
    Grahame Collins
    Grahame Collins is offline Super Moderator
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    Default

    Try This
    Telescoping steel sizes

    http://www.seniorsteel.com.au/files/...ng%20Chart.PDF

    Between the 40 & 50 mm sizes tack in strips of 3mm flat onto the 40mm section. It works well if the visual appearance does bother you. Drill regular spaced holes -say 6mm diameter and fill with electrode or mig. The pain in the bum is the flash bead inside the 50mm section from the welding process.

    Grahame
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