Thanks Thanks:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 8 of 8
  1. #1
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,538

    Default Ideas for bending some 25 SHS

    I have three braces to make for a fibreglass canopy to install inside for roof braces. These will have legs welded to ends to act as a roof support and for attaching a ceiling panel. They are 25 X 25 x 2.5 SHS,1430mm in length and need two bends as shown in the attached drawing. They need to be bent so both ends are 35mm from the straight centre section. Any simple ideas on how I can do this without a proper bender?

    Nev
    Attached Images Attached Images

  2. #2
    Join Date
    Apr 2012
    Location
    Melbourne
    Age
    57
    Posts
    122

    Default

    If your welding the ends to something, can't you cut notches out where you want the bends without cutting through, and then bend them to the angle you want and weld up the joins where it will meet.
    Will tend to crush the tube doing it otherwise.

  3. #3
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    9,096

    Default

    Hi Nev,

    I'm about to run out so I haven't worked out how wide the gap would be but at first look I think I'd cut through the top and sides with a hacksaw, bend to the angle you want and MIG weld up the gap.(assuming if there is any real load it will be from the left?)
    I dont

    Stuart

  4. #4
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,538

    Default

    Thanks guys. Did do an experimental with some thinner walled SHS to get an idea how much to bend by cutting with a grinder and 3mm cutting disc. This produced a gap that was too wide. A hacksaw width is too small a gap. Would rather not have to cut and reweld if I can avoid it. Some deformation, as long as it is uniform, is not a wory if I bend it, as it will be covered by a ceiling panel. This is for a ute canopy that I am converting to a camper for my brother. I want to put some form of insulation in the ceiling so these braces act as a support for the fibreglass top as well as attachment points for the ceiling panels and a gap for the insulation. There's no real load on it at all and the braces are mainly for getting a level surface for the ceiling and to prop up the middle section of the canopy top which has a slight sag to it. The legs at the ends will sit on the aluminium frame inside the canopy and will easly support the small amount of load on them. These will be attached with bolts through the canopy top sides to hold in position.

    Nev.

  5. #5
    Join Date
    Apr 2013
    Location
    adelaide
    Posts
    293

    Default Bending square tube

    That size will bend relatively easy without crimping: Mark on the stock the start and finish of the bend, place one end in the vice (horizontally) with the start mark lined up with the end of the vice jaws, then slide a larger tube or pipe (overtube) over the 25x25 (the end of the overtube on the finish line) and pull it around. The angle you intend bending is minor and should bend in a reasonably tight arc. Instead of welding legs on you can do the same there. The overtube will keep the sections between bends nice and straight. If the stock twists, untwist with a very large shifter. Try on a short piece about 300mm first, the end of the over tube only needs to be an inch or so from the vice for the minor bends, further for the leg bends. You can fill with sand if you like, but it's not really necessary for smaller bends like this. The rounder the shoulders are on the stock the better it will bend. You can also make a jig as per the pic. I have a number of these in different diameters.
    Attached Images Attached Images

  6. #6
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    59
    Posts
    6,605

    Default

    Do you know anyone with one of those hydraulic pipe bender things? With care that would do it. The other one I've heard of is to put the RHS on a couple of packers and lower a heavy weight onto the spot you want the bend.

    Michael

  7. #7
    Join Date
    Aug 2011
    Location
    Melbourne
    Posts
    4,779

    Default

    Hi Nev,

    no doubt you have seen some of the youtube videos showing the bending of SHS tube.
    Hand bending 1" square 18 gauge steel tubing to a 4-1/2" radius - YouTube
    https://www.youtube.com/watch?v=vguWbHxzG98
    Looks pretty easy to do something like these although the second one looks a bit dodgy, designed for single use.

    Cheers,

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  8. #8
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,538

    Default

    Got those roof braces bent, the legs welded on, all drilled with nutserts in legs to attach to side of roof. Look pretty done in SA5 Zinc plating. Trial fitted and happy with it so far.

    Nev.
    Attached Images Attached Images

Similar Threads

  1. Rod Bending Jig
    By burraboy in forum METALWORK GENERAL
    Replies: 3
    Last Post: 7th Nov 2009, 06:58 AM
  2. Bending RHS & SHS
    By geocacher in forum METALWORK GENERAL
    Replies: 10
    Last Post: 4th Sep 2007, 01:04 AM

Tags for this Thread

Posting Permissions

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