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Thread: Gantry to lift 300 KGs.
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26th Dec 2021, 09:48 PM #1Most Valued Member
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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,
Nev.
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26th Dec 2021, 10:33 PM #2Diamond Member
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Can't see any issues with your plan, 300kg is not a lot of weight.
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26th Dec 2021, 10:46 PM #3Most Valued Member
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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.
KrynTo grow old is mandatory, growing up is optional.
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27th Dec 2021, 01:38 AM #4
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.
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27th Dec 2021, 10:28 AM #5Senior Member
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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.
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27th Dec 2021, 02:50 PM #6
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
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27th Dec 2021, 04:44 PM #7Most Valued Member
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27th Dec 2021, 08:37 PM #8Most Valued Member
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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.
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27th Dec 2021, 09:21 PM #9Most Valued Member
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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.
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9th Jan 2022, 09:09 PM #10
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.
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10th Jan 2022, 09:20 PM #11Diamond Member
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10th Jan 2022, 09:25 PM #12Most Valued Member
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Pic was there earlier for me, but not now.
Nev.
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10th Jan 2022, 09:26 PM #13
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10th Jan 2022, 09:28 PM #14
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.
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10th Jan 2022, 09:34 PM #15Diamond Member
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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.
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