frame gantry crane mobile hoist for small workshop

[marruggio]

I have read many discussions of users who have built gantry crane frames for their workshop, I would like to make one myself for heavy work. height under hook three matri, three meters wide, maximum load three tons some suggestions, what material I use for the columns and the crossbar of the beam, what reinforcements. thanks waiting for suggestions.


file:///C:/Users/Mediacom/Downloads/59766da98a4b3_DesignandConstructionofaPortableGant ryHoist.pdf

[Continuum]

Your uprights are over built. A simple triangle will suffice. You are missing any lateral framing to prevent left right flex. The extent to which this angled arm pitches downward moves the point of bending into the triangle. Suggest searching WELDINGWEB. This design problem has played out in the threads multiple times. Suggest also simple wood mockup to see what works best for stiffening



Regards.

[Continuum]

Lateral buckling/sway failure thus demonstrated

[Woznme]

What are you proposing to use for the beam? Do you intend to use a beam crawler? Can you confirm your max load is metric or imperial weight.

[marruggio]

ipe H-beams measure in mm, or tubular for the legs, for the crosspiece certainly H-shaped steel beam

[Woznme]

Yes I figured that. If you want us to help you, you're gonna have to give us some dimensions. And I'll ask the question again, is your max load given in metric or imperial units?

[Bob]

I think your original plan is plenty stout. Most people over think these things. With wheels your frame will move so should be plenty stout. What you have to watch for is it falling over if your moving it to fast and hitting something and it stopping suddenly. My own shop A frame is no where near as stout built as the one in your drawings and I've had well over a ton on it.

[filetobeef]

What are you proposing to use for the beam? Do you intend to use a beam crawler? Can you confirm your max load is metric or imperial weight.

assuming it's 3000kg or 6600 lbs since his drawings are all metric.

[bcguide]

Just stumbled on this picture of a gantry on the net
It looks like a good design to me.
What say the jury

[Woznme]

assuming it's 3000kg or 6600 lbs since his drawings are all metric.

Trouble is metric weight is spelt Tonnes, he spelt it Tons which is the imperial spelling. I don't like to assume in these circumstances. Easy cleared up if he would bother to answer the question (and other questions).

[12345678910]

Yes I figured that. If you want us to help you, you're gonna have to give us some dimensions. And I'll ask the question again, is your max load given in metric or imperial units?

Not that important ? 10% difference between 2,000 pounds and 1,000 kilos

If all his other measurements are in metric cm and m, why do you think he's using imperial weight ?

[El Greco]

I didn’t read this thread too closely but will say I built the one on Weld.com. Works great to lift truck and Jeep bodies (not all that heavy). It is on wheels and has a chain hoist. Might want to take a look at it on YouTube.

[BD1]

Check out Wallace Gantry . https://www.wallacecranes.com/products/gantry-cranes/

[Woznme]

Not that important ? 10% difference between 2,000 pounds and 1,000 kilos

If all his other measurements are in metric cm and m, why do you think he's using imperial weight ?

Trouble is metric weight is spelt Tonnes, he spelt it Tons which is the imperial spelling. I don't like to assume in these circumstances. Easy cleared up if he would bother to answer the question (and other questions).

Also I don't know off the top of my head what the difference is between Tonne and Ton. When I was a kid I'd remember how many pounds in a Ton. That was a long long time ago. These days I have to smile when I poop so I can remember which end to wipe when I'm done.
I'd have to look it up, or maybe the OP can clear it up by answering the question.

[Woznme]

OK OK, I looked it up, there are 2240 pounds in a Ton. One pound is 454 grams (I remember that because it's the same number as my favourite big block). That makes 3Ton = 3050kg. So no biggie.

So if the OP can answer my other two questions we might be getting somewhere. He hasn't been back so I'm loosing interest fast.

[efesto]

Anch'io avrei problemi di sollevamento, avrei bisogno di un dispositivo adeguato, anche di una bolletta rudimentale, per aiutarmi a sollevare e movimentare carichi pesanti.

[marruggio]

my problem is to configure the legs of the gantry crane, the conformation, the section and the type, tubular or profiled, even the base crosspieces where to install the wheels, as a better configuration as a gantry with 4 legs or a portal with 2 side columns. as a crossbar I thought of a 160 mm steel beam H-type rail type railway track

[Woznme]

You've got much bigger problems than the legs if you think you are going to use a 160mm I-beam for a 3ton load. More tomorrow when I'm in my office.

Also you have not answered the question how you are intending to attach the load to the beam. Beam crawler, wrap a chain around the beam. How?

[SweetMK]

You've got much bigger problems than the legs if you think you are going to use a 160mm I-beam for a 3ton load. More tomorrow when I'm in my office.

Also you have not answered the question how you are intending to attach the load to the beam. Beam crawler, wrap a chain around the beam. How?

He has more problems than that,, what he actually says is,,,

"as a crossbar I thought of a 160 mm steel beam H-type rail type railway track"

So, he probably plans to use an old piece of recycled railroad track,,

The words " railway track " kinda get lost in the way he typed it,,

[albrightree]

Steel Beams Sizes (“I” Sections IPE/INP)
Steel beams IPE/INP are a very commonly used type of steel profile. Beams, otherwise called “I” sections, continental beams, or IPE/IPN, are available in multiple material grades, the most common are EN 10025 S275 and S355.


I believe its what we call H-beam, I can't read the drawing in the original post, he's using metric in next post. OP maybe located in EU and is quoting continental standard beams. I think the "Railway track" is a translation thing, I don't think he means "Railroad Track" hopefully . I think Woz may have a valid point, IPE 160 beam is a 6" tall x 3" wide beam with a 5mm(+3/16") web thickness. I think thats a little small for 3 ton.

Forse Italiano ?

Ciao !

[marruggio]

exactly I would like to put a 150 cm H ipe beam in the center I can load, 2000kg, from 180 mm I can load 2500kg, from 200 mm I can load 3000 kg, the hoist I hook it up with a mobile push trolley sells it the shop from which I will buy the chain hoist and wheels.


http://mtf-ferro.it/wp-content/uploa.../04/Pag.10.pdf

https://www.oppo.it/tabelle/profilati_hea.htm

https://www.oppo.it/tabelle/profilati_inp.htm

https://www.oppo.it/tabelle/carico_flessione_ipn.htm

http://www.normotech.com/schede/05/05010204.html

[Woznme]

I want to tell you about my experience with I-beams. I wanted to build a 4,000kg monorail in my workshop. For reference I attach an Australian steel chart for Universal Beams.



I did my load calculations and chose the 250UB 31.4kg/m I-beam. Made up a detailed drawing and presented it to a structural engineer to check. He said the calculations were correct for normal top loading of the beam. However, a beam crawler (or trolley) loads the bottom flange which would fail under the 4T load which would then fall (because the wheels are close together). He made me use a 310UB 46.2kg/m I-beam which has an 11.9mm flange, and then only on the proviso I would use two beam crawlers and two chain hoists at least 1m apart for full 4T loads.

I believe your proposed 200mm I-beam is inadequate for 3T loads on a beam crawler. I think you should go to a beam with 12mm flanges in this case.

Any of the leg designs are good if you use 100x100x6 square tube but you must have either gussets or corner braces up top.

Wheels are fine as long as they are rated for minimum 1T each. Don't get little wheels, they are a pain in the ***. Get at least 150mm wheels.

If you are not a first class or certificated welder, you should not attempt this project yourself. Hire a welder who is.

[marruggio]

I think the square boxes 100x100 mm resist like 4000kg columns if I have done the exact calculations, my doubt is about the base crosspieces on which to bolt the wheels. the doubt is also about the diagonal reinforcements. I think 50 cm from the beam-column junction I should add some dunes but I have some doubts, would you have some photos some drawings with this additional detail, I cannot find references in the manual books thanks. I have strong doubts about how to reinforce the frame of the structure.

https://www.oppo.it/tabelle/profilati-tubi-rettang.htm
https://www.oppo.it/tabelle/profilati-tubi-quadri.htm

https://www.oppo.it/tabelle/a_elenco_tabelle.html

[Woznme]

75x75x6 is adequate too. 3tonnes is serious weight. 100x100 will hold much more than 4tonne. It will resist any abuse. There's no kill like overkill.

[marruggio]

I believe that the weight must be calculated between that of the structure, the load to be lifted divided by the number of feet of the pillars, am I wrong? Has any friend of the forum user made one to take an example and to use as a source of inspiration?