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  1. #1
    GOT BOOST? Dockside's Avatar
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    DIY Pwc lift help

    I'm building a pwc lift and need some recommendations on tubing OD size and wall thickness. Here's a pic of the lift similar to what I'm building and my materials list. The two parts in question is the main support will be 3"OD round tube and the square tube the bunks attach to which will be 2". Now the question is what would the ideal wall thickness be?
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    Last edited by Dockside; 02-05-2017 at 10:28 PM.


  2. #2

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    definitely use schedule 40 pipe for your vertical
    when you list your horizontals as square tube, then 2" OD you are contradicting yourself.
    "OD" stands for outside diameter, which square tube does not have.
    if you meant 2" square tube, I would go with 11 gauge, that's 1/8" thick wall

    this is assuming you are using galvanized steel, not aluminum

  3. #3
    GOT BOOST? Dockside's Avatar
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    Yes just a miss type. 2x2 square tube.. I was planning to go with 1/4 thick for the 2x2, you think 1/8 will be strong enough? All the metal I was quoted is A500/A513 tubing

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    Post a detailed drawing of exactly your configuration. Without knowing the distance between supports, cantilever distance, location of PWC on cantilever etc no one can provide any educated advice.

  5. #5
    GOT BOOST? Dockside's Avatar
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    As pictured there will be (2) 2"2" square tubes 5ft long and supported at one end and need to support 1200lbs, ski with gear will be under 1000lbs.
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  6. #6
    GOT BOOST? Dockside's Avatar
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    Lift in picture is rated for 1600lbs. I know 1/4 thick will be strong enough but is is overkill for what I need? Don't want the added weight if it isn't needed.

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    there is no way that a 1000 static load could bend 2x2x1/8" square steel tubing in the picture you show
    the hardware and method that ties the arms to the post is where I would be concerned

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  9. #8
    GOT BOOST? Dockside's Avatar
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    That's what I wanted to hear, thanks for the help!

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    Quote Originally Posted by Dockside View Post
    That's what I wanted to hear, thanks for the help!
    I'll repeat what I said above, post a detailed drawing of what you intend to make. Label the members, include ALL information including lengths etc and position of the PWC. Not a generic picture, post a sketch of EXACTLY what you intend to make. If anyone gives advice without that then I would ignore their statement.

    For your safety and the safety of people around this lift - BE SURE, dont just take someones (unqualified?) feeling that it will be OK. My initial calculation indicated 2 x 2 x 1/8" is 100% NOT ADEQUATE - it will fail immediately.

  11. #10
    GOT BOOST? Dockside's Avatar
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    I'm building the lift as pictured. Keep in mind there 2 - 22 tubes so each one would need to carry a max load of 600 lbs. If I'm at all worried I can test it at work. I do collision work on a frame rack so it wouldn't be hard to hook it up and see how much force it takes to bend it. Not taking anyone's word for it, just looking for a good starting point. Like I said I know 1/4 tube will be plenty strong but probably overkill. So I'll start with 1/8 and see what happens. I deal with high pressure pulls on vehicle's 10- 40 tons so no worries about the safety aspect as I'll be sure to test that it can handle the weight.

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