Page 1 of 2 12 LastLast
Results 1 to 15 of 17
  1. #1
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,511

    Default Gantry to lift 300 KGs.

    I have two existing 75 x 75mm SHS uprights under front verandah of the house. These have a spacing of 2825mm between them. I want to buy two more uprights at 2200mm to attach to the inside of each of these with 75 x 175mm x 12mm U bolts. These two uprights will have a flat plate welded front and back to retain another 75 x 75mm section of SHS 2825mm length, sitting on top of the uprights. Thinking of 3mm wall for the uprights and 6mm wall for the cross beam. This is so I can lift the Optimum Lathe of the trailer, pallet included, then attach four castors to bottom of pallet, so I can get it under the house through the door. Once there, I can then use my small pallet lifter to get it up onto a bench eventually. Question is, will the 75 x 75mm x 6mm be adequate enough to support the 300KGs from the centre. I have attached a pic of the the verandah posts and the doorway I have to get it through. Doing it this way will avoid doing anything to the existing posts, as they will just be holding the two extra uprights vertically,
    Attached Images Attached Images
    Nev.

  2. #2
    Join Date
    Aug 2006
    Location
    Melbourne
    Posts
    1,105

    Default

    Can't see any issues with your plan, 300kg is not a lot of weight.

    Sent from my SM-G935F using Tapatalk

  3. #3
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Hi Nev,
    At the bottom of the MW Forum, you'll find a section that's called CONVERSIONS & CALCULATIONS. Under that heading, you'll find another section called beam deflection calculator.

    https://metalworkforums.com/f218

    Beam deflection and stress calculator

    If you fill in the tables, it will give you the information needed You won't find the size of the RHS you want to use listed, so you'll need to fill in another table below the weights one.


    There are all sorts of help listed in that section.
    I hope that this will help you.
    Kryn
    To grow old is mandatory, growing up is optional.

  4. #4
    Join Date
    Sep 2021
    Location
    Western Sydney
    Posts
    262

    Default

    6mm is overkill for 300kg. I made a mobile gantry out of old rhs 50x50x2mm , it spans 2.7m across and 4m high (corners braced with 3mm angle) , i've lifted and rolled around 500kg multiply times no problem , using a 1tonne block and tackle attached to the top. A typical 2 tonne mobile engine crane boom wall thickness is only 4mm thick for comparison.

  5. #5
    Join Date
    Sep 2009
    Location
    Newcastle
    Posts
    341

    Default

    Attaching castors to pallet may be the riskiest part of plan.

    I did that when moving my 300kg surface plate. One corner of the pallet broke and wheel collapsed, resulting in 300kg on a big tilt. Eventually rescued with levers, sheets of MDF and rollers.

  6. #6
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    For the price of the steel, you would be better off buying a 2 ton engine crane, either new of there are some good bargains used out there

    Sent from my 5007U using Tapatalk
    Using Tapatalk

  7. #7
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

    Default

    Quote Originally Posted by Dave J View Post
    For the price of the steel, you would be better off buying a 2 ton engine crane, either new of there are some good bargains used out there
    Sent from my 5007U using Tapatalk
    And you can use it to lift it onto your bench and anywhere else you wanted to lift something.
    To grow old is mandatory, growing up is optional.

  8. #8
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,511

    Default

    Engine crane is out. Besides a dislike for them, considering most are pretty crappy, I doubt it will fit through doorway and probably tip over if it did, as I have to get across the door track and height under house may be a problem. I have to check on the steel situation, as I may already have some I can use. Moving stuff will not be a problem further down the track, when I make the new hubs and guide wheels for the mast on my one tonne pallet lifter. I have a small 400KG one as well to lift the lathe off pallet and onto bench, when it's under the house.
    Nev.

  9. #9
    Join Date
    Mar 2011
    Location
    Southern Flinders Ranges
    Posts
    1,536

    Default

    Clamp your horizontal beam across the the two posts, set the trailer in place for the lift, prop the horizontal with timbers clamped under the beam set just wide enough for the trailer to come out once the weight is off it. Props don’t need to be massive, a couple of chunks of 90x45 framing pine will get it done. If you do that your unsupported span is only about 1600ish (depending on the size of your trailer) and your verandah posts are only providing location.
    I’ve lifted across my trailer using a slab of 190x45 structural pine as the horizontal with no issues at weights in excess of your lathe.

  10. #10
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    Did you come up with a solution?

    Not sure why you have a disliking to engine crane/hoists as I honestly think they are tool great used the right way.
    .
    Around 15-20 years ago I bought a true 2 Ton capacity one new for $300.
    It was at my local markets which only sold new gear, including lathe tooling, clamps spanners and everything else, but sadly the markets have now closed now. I used to buy a lot of their Indian tooling there cheaply from both sellers.

    Between 2 sellers I could either pick a air over hydraulic one with a 3mm frame or a standard hydraulic one with 4mm tubing.
    Of course I picked the heavier 4mm one.

    It has lifted my mill at 950kg 3/4 reach for clearance, but was struggling as it was well over it's limits at that reach, but nothing broke.
    I moved 4 times with the same engine hoist and a homemade gantry for heavier gear etc.

    Some of the engine crane crap available now from Supercheap etc rated at 1200-1250kg I wouldn't buy as they are so light.

    I just seen 2 days ago a 2 ton one listed locally for $100, pretty hard to beat that price buying materials etc as steel has gone through the roof.

    Sent from my 5007U using Tapatalk
    Using Tapatalk

  11. #11
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    1,407

    Default

    Quote Originally Posted by Iron triangle View Post
    Here's a quick pic of ''Ted" the wooden gantry, i made it out of Bunnings garden wood one night in a hurry as i had no money to buy a proper one , i used it for years until it started to split and bow beyond safe use. RIP ted. It once lifted a max of approx 1500kg using a block and tackle. It used to moan and carry on but always did the job, lol . The wheels made it so much better. Simple but effective. I've since made a metal version that disassembles with a 2t rating but i liked the wooden one more, it had character.
    I don't know about everyone else, But I'm not seeing any pictures here, did you post the pic, or is the site playing up?

  12. #12
    Join Date
    Nov 2008
    Location
    North Brisbane. Qld. Australia
    Age
    70
    Posts
    1,511

    Default

    Pic was there earlier for me, but not now.
    Nev.

  13. #13
    Join Date
    Sep 2021
    Location
    Western Sydney
    Posts
    262

    Default

    Quote Originally Posted by Ropetangler View Post
    I don't know about everyone else, But I'm not seeing any pictures here, did you post the pic, or is the site playing up?
    Sorry i'm editing & updating pics and trying to sort that , it's back up.

  14. #14
    Join Date
    Sep 2021
    Location
    Western Sydney
    Posts
    262

    Default

    Here's a quick pic of ''Ted" the wooden gantry, i made it out of Bunnings garden wood one night in a hurry as i had no money to buy a proper one , i used it for years until it started to split and bow beyond safe use. RIP ted. It once lifted a max of approx 1500kg using a block and tackle. It used to moan and carry on but always did the job, lol . The wheels made it so much better. Simple but effective. I've since made a metal version that disassembles with a 2t rating but i liked the wooden one more, it had character.
    Last edited by ubeaut; 1st Feb 2022 at 10:37 PM.

  15. #15
    Join Date
    Oct 2008
    Location
    N.W.Tasmania
    Posts
    1,407

    Default

    All good, thanks for the reply and the re-post of the picture. Thanks to you too Nev, for your reply. I was wondering if it was a site issue or a glitch in my system, but is almost fixed before I knew it was broken! Cheers all.

Page 1 of 2 12 LastLast

Similar Threads

  1. Adjustable height gantry
    By OxxAndBert in forum METALWORK PROJECTS
    Replies: 16
    Last Post: 13th Mar 2022, 07:28 PM
  2. Wanted to hire 2 ton Gantry SE QLD
    By Reidy41 in forum WANTED TO BUY
    Replies: 11
    Last Post: 21st Aug 2021, 11:30 PM
  3. Swing gantry for the workshop
    By OxxAndBert in forum METALWORK PROJECTS
    Replies: 48
    Last Post: 30th May 2020, 11:27 PM
  4. Now that's a CNC gantry mill....
    By jhovel in forum CNC Forum
    Replies: 5
    Last Post: 8th Nov 2018, 07:55 PM
  5. Made myself a Gantry Crane for the workshop (Video)
    By Tilly819 in forum METALWORK PROJECTS
    Replies: 1
    Last Post: 14th Jul 2018, 02:20 PM

Posting Permissions

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