Looking to build a moveable hoist

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I've been thinking about building a large hoist, like this one, mainly for my Bobcat 225 to be moved on and off of my truck but also for other random things that I may need it for. I need it to be moveable so I was going to put some pneumatic tires on it because the solid ones just plain suck for moving around a yard. Any suggestions? I don't have the exact measurements I need but i'm thinking about 8'x9' that way I can use it for larger things in the future if I ever need to. Attached Images"Firearms stand next in importance to the Constitution itself. They are the American people's Liberty, Teeth, and Keystone under Independence." - George Washington
Reply:I'd take out the bottom cross pieces.  Because you would never be able to get under it.---No good deed goes unpunished---
Reply:The only reason I had them there is because I was talking to a friend and he was telling me that it would probably need some sort of cross support on the bottom so I just kind of threw this together this morning, didn't get too much sleep and so i'm still half asleep "Firearms stand next in importance to the Constitution itself. They are the American people's Liberty, Teeth, and Keystone under Independence." - George Washington
Reply:You can get rid of the bottom cross beams by adding gussets at the top corners.   You will be disappointed if you leave those bottom brackets in.   What weight rating are you going for?  Are you going to build in round tube, square tube, or i beam?
Reply:Originally Posted by Lil UglyYou can get rid of the bottom cross beams by adding gussets at the top corners.   You will be disappointed if you leave those bottom brackets in.   What weight rating are you going for?  Are you going to build in round tube, square tube, or i beam?
Reply:Look at what is listed here. it should give you some ideas. If anything go larger than what they are using. Keep in mind there are quite a few different weight 8" wide flanges for example. just because it's 8" doesn't mean just any 8" beam will work. The heavier ( or deeper) the beam, the more weight it supports.http://www.wallacecranes.com/http://www.wallacecranes.com/triste3.htmAlso you had better be really good with your welds if you plan a project like this. If you can't do code grade welds in all positions, an overhead lifting hoist shouldn't be on your project list..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Hi there,I built a large moveable crane. Adjustable height.  Found some plans on the net to handle the weight......then run my own calculations, then modified them......came out very nice.  I could send you some pixs and a schematic if you like....hope I can still find them.Miller Big Blue Air PakMiller 350P, Python GunHyperthermsSpool gunsMetabo GrindersWe "dooit" as a family...."a family that sleds together stays together"......from sleddin to campin to 4 wheelin to workin.....gotta enjoy life somewhere!
Reply:IMO I wouldn't use pneumatic wheels. When loaded your gonna lose stabilty.
Reply:A design similar to this one seems much more practical:http://www.amazon.com/Engine-Cherry-.../dp/B0013XLIMW
Reply:Originally Posted by ezduzitA design similar to this one seems much more practical:http://www.amazon.com/Engine-Cherry-.../dp/B0013XLIMW
Reply:Originally Posted by ThorsHammerEngine hoists are limited it height. and the small wheels don't like being on anything but smooth concrete.
Reply:I would suggest building a low cart with big tires to lower the welder onto and haul it around so that you arent trying to move a loaded hoist...Hobart Stickmate LX235AC/160DCRanger 305GVictor 315 O/A rigHope to acquire in the next couple of years: Hypertherm PM45 and Dynasty 200DX
Reply:Originally Posted by JD955SCI would suggest building a low cart with big tires to lower the welder onto and haul it around so that you arent trying to move a loaded hoist...
Reply:If you install a gin pole on the truck, you can lower the welder onto a small cart.
Reply:Originally Posted by ezduzitIf you install a gin pole on the truck, you can lower the welder onto a small cart.
Reply:I got a $25.00 boat trailer and modified it for my trailblazer. Made a cart for the Trailblazer to keep in garage for emergency power. Doesn't take up much room.  At work we made some portable gantry's. We had ''A'' frame uprights with steel wheels. On the top of the ''A'' was a 1/2'' resting  plate that was larger then the beam . The beam sat on the top of the plates. Above the beam was a piece of 8'' channel. The channel and top plate of the ''A'' frames had matching holes  [ four each ]for sandwiching the beam between the channel and top plate. This allowed us to adjust the spread and use different size beams.http://weldingweb.com/vbb/showthread.php?t=163241  My Trailblazer setup
Reply:Look at the HF gantry crane, fairly cheap, and stout enough to lift a TB IIRC
Reply:Originally Posted by DSWhttp://www.wallacecranes.com/triste3.htm
Reply:My 2c.Are you going to pick and move this by yourself?
Reply:Originally Posted by millratMy 2c.Are you going to pick and move this by yourself?
Reply:Originally Posted by Jeromy_EMy dad is a retired Marine Corp., Vietnam vet, and he lives with me, he's always around to help me out with anything I need like all the projects I seem to come up with. I just wish he would let me teach him to weld  He thinks that welding instantly burns up your eyes.
Reply:I was poking around for various premade options for myself and found this little toy. Seems interesting. http://www.amazon.com/Maxxtow-Towing...=pd_sbs_auto_1
Reply:Pretty clever design, using the receiver hitch as 1 leg.
Reply:Yup........... looks interesting alright. Nice concept, although it looks like H.F stuff out of China.No info on wall thickness of the square tubing. Not any good pic's of the weldments.Cantilever of the jib to legs is suspect combined with the jib stop weldments. That's huge as far as safety in a 'runaway" scenario. Load goes up, so does the truck, that increases the [potential] inertia of the load depending on the grade conditions.  What effect does that have on the leg angle? The angle of the legs will tend toward the truck box if they slide as the load is removed from the truck. If the horizontal tubing doesn't have sufficient wall thickness, it may collapse as the legs slide toward the box.Not trying to discourage you, but if the tubing wall thickness is sufficient, some minor mods and paint will get you where you want to go out of the truck.Now you need a cart.  Or some R.T. running gear for the Miller after it's off.
Reply:Oh. Forgot to mention, Delete the nut/bolt connections and go with safety pins for convenience.Junkyards use a fairly common design that use car tires. Something like this:http://www.pirate4x4.com/forum/12945551-post28.htmlJust read the accident report below first so you know what your getting into. This happened here in Washington so the report was fresh in my head. As others have mentioned outdoor gantry cranes are for lifting... not moving or transporting. http://www.lni.wa.gov/Safety/Researc...alvageYard.pdfNote that in the report they really didn't have any real issues with the design but the design lead to a fatal accident due to misuse.Even here in the shop on the concrete I lift the load with the gantry and then set it on a cart or pallet for moving.I suppose you could make a cradle that you lower the machine onto before moving the gantry. Something like, lift machine, move truck, lower machine onto cross bar cradle on the gantry and them move the gantry with the machine secure. I'm interested to see what you devise. Keep us posted.
Reply:Or you could make the end pieces of the crane more like isosceles triangles to give it more lateral stability, although that would make the whole rig a heck of a lot bigger.You could also tow the load by pulling on the [HEAVY OBJECT] rather than the lighter crane ... and pull it with a long chain, so that you're not standing under it if it falls or fails (or wear a hardhat if you do)...lots of things could have been done better or different to prevent that accident.
Reply:Originally Posted by forhireJunkyards use a fairly common design that use car tires. Something like this:http://www.pirate4x4.com/forum/12945551-post28.htmlJust read the accident report below first so you know what your getting into. This happened here in Washington so the report was fresh in my head. As others have mentioned outdoor gantry cranes are for lifting... not moving or transporting. http://www.lni.wa.gov/Safety/Researc...alvageYard.pdfNote that in the report they really didn't have any real issues with the design but the design lead to a fatal accident due to misuse.Even here in the shop on the concrete I lift the load with the gantry and then set it on a cart or pallet for moving.I suppose you could make a cradle that you lower the machine onto before moving the gantry. Something like, lift machine, move truck, lower machine onto cross bar cradle on the gantry and them move the gantry with the machine secure. I'm interested to see what you devise. Keep us posted.
Reply:Originally Posted by forhireI suppose you could make a cradle that you lower the machine onto before moving the gantry. Something like, lift machine, move truck, lower machine onto cross bar cradle on the gantry and them move the gantry with the machine secure. .
Reply:forhire, interesting reads.Gantries have wheels to move the unloaded weight of the gantry itself.  If one is going to DO a DON'T and move it under load, keep the load (center of gravity) as low as possible. IE: From a truck bed. Load high enough to clear the bed. Move the TRUCK! Lower the load before any other operations. Secure the load to the uprights at four outermost points to help control load swing if it's to be moved under load. Secure meaning taught, not tight enough to pull the uprights inward. NEVER be under the load. See it on my job, they're fired on the spot. Never get between a rock (load) and a hard place. If it's going to go, let it, get out of the way.The only good thing I saw was a fixed pick point on the load beam. Imagine moving the gantry around with a hoist on a trolley without a trolley locking system. There's a "figured it out in a heartbeat"......... after the fact.In the pics. What never ceases to amaze me is the crappy way of supporting the vehicles in the bone yards. Load on a round object??? Even wheels laid on their sides and stacked........ no possibility sliding there? WTF? That's on the owners, as far as I'm concerned, for allowing it.The customer (and maybe the victim) were crawling around under that unstable mass of bone. That'll be the next headache brought on by a member of the bar association for an owner. I can see it coming, if it hasn't happened already.