Need Help with receiver mounted hoist

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Trying to get help on hunting sites but ya'll understanding of welding strength and design is much greater.This is what I have come up with to lift deer and hogs for cleaning and transport.All of the black "tubing" is 2" square thickness to be determined.The blue tubing is 1.5" square also to be determined but must fit inside of the 2" tubing.Two design changes that I did not picture is I am using an electrical winch for this project and instead of mounting it down on the receiver, I will mount it to the 2" L that has the pulley points.Also I've got to in some way get the bottom portion that will rest on the ground when not traveling to pivot so I can load game into the back of the truck.Bought a 2000# winch which is way overkill but got a good deal on black friday so maximum capacity is a must.Also cost, extremely cheap version only cost $90 on amazon, so with the $50 really don't want to spend $100 on metal so I hoped to get away with only 20' total so 10' of 2" and 10' of 1.5"What I don't know of, where with weld strength be an issue?  Can you weld square tube to square tube parallel and have any strength?  If I need to make an attach point for a clevis, how heavy of steel rod is required for 1000# or so?  Any design improvements you can see?So to recap, relistically this will pick up a few 100-200 pounds animals a year but if I'm going to build it I want to build it right.  We have a 450# water tank we use and if this winch could be used to load and unload that from the bed of a truck that would be a huge plus so assuming a reasonable 500# capacity with the main beam resting on the ground would be good guidelines.  For pivoting I was just going to take a solid steel rod and weld it to the inside of the 1.5" tube and pivot on it.Would love to hear ya'll input...
Reply:http://discussions.texasbowhunter.co...?t=1396&page=2here is some inspiration.
Reply:Your drawing looks like you want it to telescope out or back in for storage. And you want it to pivot to swing the boom over the bed of the truck. Square tubing won't turn inside square tubing. It also won't scope in and out due to the weld bead on the inside of the outer tube unless you find a way to eliminate it. If I were doing it, I would reverse where you have the 2" & 1 1/2" tubing, this keeps the weight down lower. For the swivel, consider a trailer wheel bearing/spindle mounted vertical at the transition from the horizontal/receiver tubing to the vertical/standpipe section. This would allow the whole thing to swing as one unit, winch and all. Or you could mount it at the top to hold only the boom section, but I don't know how you could gusset it and still swing, the winch cable would wrap around the standpipe too doing this. Unless you mount the winch on the swivel with the boom. Since it's electric only the control/power wires would turn. I built two A frames and put 2" tubing inside 2 1/2" tubing by grinding a groove in the 2" with my grinder, but then I only had to go about a foot on each leg to do it. I guess this might work for what you want to do, just don't go any deeper than needed to make the peices slide together. Your 2" tubing will need to be 1/4" thick to make a snug fit for the 1 1/2" tube to fit in with no exess play. I would probably want to use 1/4" thick on the 1 1/2" also, to make sure it would better stand up to that 2000# winch you have. There are starting to be some mighty big feral hogs in Texas these days, and you may end up skinning/loading some of them if your lucky. I've seen some that outweigh a good sized whitetail.I'm sure someone else will chime in afterwhile with other ideas, this is all I've come up with so far. I'll be back later after giving it more thought.I'm not sure how to load a link to another post, but do a search on "Combat Jump Pick-up Truck crane". His project may be just the thing your looking for. I'm sure he wouldn't mind if you used some of his design ideas for your project(if he does don't tell him you got the idea from me).Last edited by Bistineau; 11-28-2011 at 04:45 PM.
Reply:http://weldingweb.com/vbb/showthread.php...ht=combat+jumpfor BistineauThere are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:Square is easier to work with as far as fitment/alignment. but this seams like something for pipe. if for nothing else but the telescoping/pivoting portion of the unit. I'll have to noodle it for a bit before I can give you any constructive/descriptive solutions.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:No matter what wall size 2" tube you use, I'm betting the 1 1/2" will be your limiting factor as far as bending is concerned. Your mast will bend right where the 2" and 1 1/2" meet. If you want stiffness in bending in a column, you want to go with the biggest tube you can in OD size not wall thickness. That or you had better plan on a lot of bracing to keep it absolutely straight so it's in compression and doesn't go into bending, similar to whats done in a guyed tower. Balanced right you can put one heck of a load vertically on an alum soda can. But as soon as the wall bends even the tiniest bit, it will collapse as it buckles.You might also want to look at this thread where I did some calcs on square tube.www.weldingweb.com/vbb/showthread.php?t=59128From that thread a comparison on tube strengths... You can easily see going bigger gains you quite a bit of stiffness. Originally Posted by DSWDoing the math ( assuming I did it right...) using those numbers for I given above.1 1/2"  will take 1.4 times the load before buckling that 1 1/4" will over a 12' length.1 3/4"  will take 2.3 times the load before buckling that 1 1/4" will over a 12' length.2"  will take 3.6 times the load before buckling that 1 1/4" will over a 12' length.2 1/2"  will take 7.1 times the load before buckling that 1 1/4" will over a 12' length.
Reply:That just throws a wrench into things.....Kept thinking that upping the thickness would make it all better but certainly see what you are talking about The reason I picked the sizes I did was trying to stay with either 10' of two metals or 20' of one as that is what my shop likes to sell.Realistically this will be for lifting 1-200 pounds but have a water tank that pushes 500lbs that would be nice to be able to maneuver if possible but not required.There will be some force on the lift as I pull the game to the truck if i can't drive right over it, but then most of it is lifting and with a piece run to the ground should really increase strength.I keep thinking tubing would be easier for pivot reasons however, having it collaspseable at all would make lining up a pin very difficult.  Also getting a solid weld to attach the winch receiver to the the mast had me concerned and felt I would be better off with square up top.
Reply:If you run a leg down to the ground, don't make it solid or use a pin set up. If you load the hoist or truck enough to need that leg, you'll never get it loose as long as the weight is on it. Use a trailer jack instead.As far as the leg increasing your load capacity, that would only apply if you planned to exceed the weight limit of the suspension. You might simply want to look into a gin pole design instead. Simple and easy. and simply pull the pins and take down the poles, or set it up so it folds back over the cab. For the light loads you are thinking about the design shouldn't be that hard to come up with.I'm trying to think which member has the gin pole truck as his avatar and did a pretty decent write up on how he put it together. I'm thinking something like this would work well and keep material s down.Last edited by DSW; 11-28-2011 at 09:30 PM..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:A picture of the rig would help too.There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:I pulled a couple of stumps with this rig. Attached ImagesCity of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
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Reply:Is any strength added running the 45 degrees or the double 45 degrees?  Otherwise I'll just run this setup with 90 degree corners.I like have the bottom at a 45 so I don't bottom out if I go down a hill but would still clear the tailgate.