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  #31  
Old 02-21-2019, 05:22 PM
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Whitetrash Whitetrash is offline
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I think 500 Lbs 16' out is going to be sketchy strength wise. But, I think there is a way to strengthen it with your cable. I tried to modify your drawing with crappy results but it still gets the idea across.
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  #32  
Old 02-21-2019, 09:13 PM
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Sorry forgot to talk about pivots. At the base of the boom a pivot to swing and raise the boom. At the top of the post the winches can pivot 360 degrees.
As far as outriggers go I can always add when it shows the need. The boom actually will be 16 feet long. So it will never have a lift at 16 feet out, it will be more like 10 to 12 feet.
What I am thinking for the head would be that the boom is raised by a pulley mounted to the axle of the lift line pulley. With the setup I should not have any side loads on the boom, just compression.
The reason I am not going for a cherry picker style style boom is that I believe I can get away with lighter materials and simplicity in the construction. I have definitely been down that road in my sketches and thoughts. It is not ruled out by any means just going for simplicity. If this turns out to be a shitty design materials won't be wasted just recycled into something else.

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  #33  
Old 02-22-2019, 03:55 PM
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Well I am going to pick up some steel in an hour or so. I have decided to go with some test building. So with some slap together quick and dirty setup on my loader tractor I'll try some weight. First will be the 500 Lbs, if that goes well I'll keep adding weight till it looks sketchy. I have 20 100 Lb suitcase weights so I'll be able to test beyond my intended limit. If I go up to my brothers shed there's another 40 stacked in the corner. I'm not going to go that far but it's kinda a wow factor to me that I have access to 3 tons of tractor weights.

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  #34  
Old 03-06-2019, 02:11 PM
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The just get it done mentality hit me again, sorry no pictures of my success and failure. Lessons learned, the 3X4X.25 tube is heavy enough for the horizontal and vertical supports. The 3X3X.25 going into the receiver was not good enough it had way too much flex.The pole head where the boom lift attached to the same axle as the load lift works to not put any side load on the boom so my boom tubing is in all reality probably overkill. Having the boom pivot at the bottom separate from the winch mount at the top isn't really practical, winch line will tend to wrap on one side of the drum.

My current design is a horizontal tube bolted to the frame with a support jack at each end. The vertical tube is on the right side of the bed extending about 2 feet above the bed rail. I am installing one set of hinges so the boom can go from straight forward 3/4 of a circle around to straight out to the right of the truck. The top and bottom pivoting pieces are tied together with a square tube to keep my winches in line with the boom. More to come later, hopefully including pictures. BTW the original setup held 500 Lbs at 16 feet with the boom straight out, the mast just had more flex than I wanted.
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  #35  
Old 03-06-2019, 07:54 PM
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Right now the frame is laying on it's front side and all I have on the upright is the lower boom mount. The second picture is where it bolts to the truck frame. Picture 3 is my boom head. It will go on the boom oriented this way with the top pulley raising the boom and the lower pulley lifting the load. And the last picture is my start on the boom and winch mount. The tube sticking up at the left is for the bottom of the boom the middle one is for the load winch and the flat plate on the right is the boom winch. Click image for larger version

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  #36  
Old 03-06-2019, 08:02 PM
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Sorry about the fuzzy pictures my cellphone lens is scratched something terrible. I had to stop working last night after I dropped a piece of tube on my wire welder lead and mashed the wire liner. That on took a while to figure out, it would well fine for a second or two then stop feeding. I finally got it figured out after I got a couple of rats nests at the feed rollers and the wire wouldn't feed through by hand. Today I got a new liner and installed it, this thing has never worked this good, I'm glad I spent the time to fix it now rather than switching to stick or Tig. I also tried the cooking spray to keep the splatter off of my metal, works great, now what's the best way to get it cleaned off so I can paint?

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  #37  
Old 03-06-2019, 08:33 PM
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You could gusset the mast to reduce the spring.
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  #38  
Old 03-06-2019, 11:17 PM
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Well after some thought some gussets would probably be a good idea. Where the cross beam meets the mount tubes. Every time I sit down to ponder my next move I get a visit from my shop cat. He's really friendly but those front paws make me nervous there's 14 claws there.Click image for larger version

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  #39  
Old 03-08-2019, 10:45 PM
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Not sure if this is drawn right for the part that was flexing on you, but might help you brainstorm another way of adding strength.

On a forklift boom we had at old job, we added a couple runs of 1/2” round bar with a couple of plates in the middle to add support the the horizontal boom. I have seen these on older building floor joists to help support long spans too. I forget the proper name for them at the moment, but someone will remind me shortly.


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  #40  
Old 03-10-2019, 01:02 AM
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Don't know if this is proper or not, Brian but, I've heard that sort of arrangement called a, "Strong back."

Dave
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