Miller Electric

Welding Discussion Forums

Home » Resources » Communities » Welding Discussion Forums
 
Miller Welding Discussion Forums - Powered by vBulletin

Results 1 to 9 of 9
  1. #1

    Default aluminum frame to handle 8000lbs of pull

    Customer Is trying to build a pontoon boat to haul logs across a river. He wants me to design and fabricate a frame that can with stand 8000 lbs of torque to mount a big winch on. I have never had anyone give me such a precise strength without a print. I was thinking 3"x3"x1/2" angle for the perimeter of the frame and 3"x1/4" for the braces across. Dose this sound strong enough? I've never had to get strength out of alum like this before and I'm not familiar with its capabilities. Anyone have any ideas. Design wise that may strengthen it?

  2. #2
    Join Date
    May 2011
    Location
    Bossier Parish La.
    Posts
    549

    Default

    Which is it? 8000 Lbs. of pulling force, or 8000 Ft. Lbs. of torque? I would think it is pulling force more than torque. He probably has a specific winch in mind he is wanting to use for this. It looks like you may have additional work from this customer that he doesn't know about yet. He will be needing to anchor this boat to something SOLID to use that much pull on a log, in which case, he is going to be pulling the boat apart somewhere else. So then you will get to fix that problem too, then do a bunch of reinforcing there too.
    You could just make the winch mount from steel, as you are most likely more familiar with the strength available from it. He's just thinking to make it from aluminum since that is what the rest of the boat is made from and to keep it light weight.
    For this purpose, there is going to need to be more thought processes than just mounting a winch to a pontoon boat.

  3. #3
    Join Date
    Dec 2013
    Location
    At the epicenter of the Green Mountain Range in VT
    Posts
    287

    Default

    Call up Shelby Stenga. He sinks a boat or whatever you might call that contraption at least once a year.

  4. #4
    Join Date
    May 2011
    Location
    Bossier Parish La.
    Posts
    549

    Default

    Here's the other part of this thread on welding discussions.

    http://www.millerwelds.com/resources...8000-of-torque

    I would like to see this rig when completed. Sounds like it is something from Swamp Loggers.

  5. #5
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,704

    Default

    Bistineau, I have to agree with you, he needs to give us a lot more info, What is he going to anchor the pontoon too, Pontoons are good for about 2500 lbs or so.

    Try putting 15 people on say a 24' twin toon and your bringing water up over the floor with a small wave.

    A 28' triple toon. you might be good for a maximum of 18-20 before your getting water over the deck.

    Figure 20 people at 175 lbs. each and we are talking 3,500 lbs. so its pretty safe to assume he's not lifting that much.

  6. #6
    Join Date
    May 2011
    Location
    Bossier Parish La.
    Posts
    549

    Default

    I don't think he wants to lift it, so much as pulling it free from the suction of the mud for salvage purposes. Which means he will have to tie to a tree on the bank to hold the boat in place while the winching is going on. I believe the guy is trying to salvage sunken logs(cypress most likely) from the river bottom, to sell. Watch an episode or two of "Swamp Loggers" on History Channel and you will see a couple of guys doing this with a pontoon boat. But yeah, some more info on what the intended purpose is would help to narrow down what is expected of this project.

    I think we need to wait for the OP to check in with more info on this project and what is expected of it.
    I don't even have any idea what equipment Dent welder has to use on this build. Bailing wire/ duct tape drill & Bolt, MIG, TIG, stick, O/A? . What do you have to use on this?
    Last edited by Bistineau; 04-09-2014 at 07:42 PM.

  7. #7

    Default

    two pieces of 3x3x1/2 aluminum will hold 8000 pounds in tension easily. The next question is will the force always be applied in tension, or at what angle, and will the attachment of the angle to the boat support the load.

    If horizontal pull I'm sure the boat would have to be anchored to pull 8000 pounds towards the boat instead of pulling the boat to the load. To prevent pulling the boat apart the anchor should be attached to the winch mount itself and that would prevent the winch from getting ripped off the boat also. If pulling off the bottom of the lake the boat won't move but there is no way to anchor the winch mount straight up so the attachment to the boat would need to be strong enough to do the job.

  8. #8
    Join Date
    Dec 2010
    Posts
    315

    Default

    if possible I would put a 1/2 doubler plate on the deck and make sure it is atleast a 1' wider than the winch mount. I weld 1/2" padeyes to slickline boxes and we test pull them to 10k the boxes are 3/8 thick I'm sure that pontoon is around a 1/4 or less so go as big as you can with a doubler.

  9. #9
    Join Date
    May 2011
    Location
    Bossier Parish La.
    Posts
    549

    Default

    Has this project made any progress since this thread was started? If so what is going on with it? Have not heard anything from the OP lately about this. Got any pix of the boat this is supposed to be mounted to?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Function split() is deprecated in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/footer.inc.php on line 82

Welding Projects

Special Offers: See the latest Miller deals and promotions.