What is the bending strength of 2" OD 304L tube; .065 & .120 wall? - Page 2
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  1. #21
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    Quote Originally Posted by Milland View Post
    . . .and Gordon has to keep his remaining neurons in good shape.
    Ha! You noticed the decline, eh? I told my wife that any day now she'd not be the only one to see it!

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    Think about 2" x 4" x .12" rectangular, stainless-steel bars. 20' long supported not at the ends, but moved in to give a good balance between sag and yield avoidance. The image shown below would (I think) sag about .56" in the middle with a 600 pound load shifted completely to one side and about .43" at the start/finish bar shifted to one side.


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    Thanks, David.
    Rectangular SS tube like that is too expensive and for this installation, too heavy. I intend to inset the supports like your drawing, the distance will be determined by ultra precise and complex testing: I'm going to lay two tubes across a couple of cement blocks and have the guy bounce on 'em in the middle. I'll move the blocks in until I get an acceptable amount of deflection.

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    Quote Originally Posted by Gordon Heaton View Post
    ..I intend to inset the supports like your drawing, the distance will be determined by ultra precise and complex testing: I'm going to lay two tubes across a couple of cement blocks and have the guy bounce on 'em in the middle. I'll move the blocks in until I get an acceptable amount of deflection...
    Sounds about right. This ain't rocket science. If you move the legs in from the ends a bit I'm sure the
    2" tube will be adequate.

    And a little hint: When you attach the legs angle them out a bit so they're wider at the bottom (at least a
    foot each side). This will make the bars more stable and it will also allow a little more "swing" room between
    them so when the boys are playin' they'll be less likely to swing into the legs...

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    Also when the legs are welded on they will help reduce sag, saging on the monkey bars will have to bend the legs.

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