my new crane

jonnyB

jonnyB

Well-Known Member
Joined
Nov 15, 2006
Location
rockwell, NC
any engineers on here that can help me load rate this thing?
 

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im serious about load rating this, i know theres some smart people on here. i have a bigger chain for it, i just dont have any hooks for it yet. if anything happens i think the reciever will bend first. i would like to know how much weight the chain takes off the reciever
 
You probably don't want to load rate it, as you will be disappointed. With that said, I really like it and it looks super useful. I can crunch some numbers if you are serious, but i will need a good many measurements. The crane boom will be much stronger than the rest of the setup. The hitch is definitely the weak point.
 
That's pretty cool I could have used that to load my one tons the other day. I bet an outrigger or folding trailer jack would help and a gusset or stiff arm at the inside of the beam. What does the rig itself weigh?
 
Pretty kewl!
Something under the hitch to keep the truck from squatting would help it not have a peeling effect.

Daylight pictures with a material list would help the engineers
 
Thats what I was thinking too...put something under the hitch/base of crane or some legs/braces to the ground like they do on wreckers/service trucks and real cranes.

Also another piece of that I beam brace under the middle pulley between the two I beam angles would make it stronger too.
 
yes, the chain and winch attach to an apparatus that slides into the turnover ball mount in the bed.i thought about putting a jack at the hitch, but i need to be able to drive the truck around to move stuff. all im really worried about is the weight on the reese hitch. i can take some measurements today. i dont even know where to begin at calculating the forces on the hitch.

the heaviest load i would use it for would be to pickup a cab, bed, or maybe some steel beams. i thought about hookin it up to a parts yota just to see what would happen, but i talked myself out of it.

and as far as the rig weight, idk, but its heavy. f350 DRW crewcab powerstroke 4x4
 
If you were worried about the weight on the hitch, maybe fab up a wheel that rotates like on a bush hog so you could move it and the hitch would be supported at the same time
 
I will give you a very rough number.
Assumptions:
Strength of beam is sufficient
Weak point is at receiver hitch
Hitch is rated at 1000lbs tongue weight (probably a bit high, but we'll run with it)
Weight of crane is 150lbs
Angle of line between receiver and crane pulley is about 45deg to horizontal
Angle of line between crane pulley and winch is about 30deg to horizontal

This is all very loose math, but using those numbers, I get somewhere around 1200lbs. Now consider that the safety factor for most lifting equipment is 1/3-1/4 of the max strength, that takes that rating to 300-400lbs working load.
 
If you need to move it around, what about some drop down support legs like a backhoe...adjustable for terrain of course.
 
The other thing to think about is that you are using a winch, not a hoist. It's only as strong as the brake on the winch. I see tons of warnings not to use winches in such a manner as the brake can fail, but get yourself an electric hoist and it'll be a bit safer.
 
ok, i guess i dont need it load rated. this is prolly the most i'll ever lift with it.
 

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I'd like to build something like that to use around the house.....Take some more pics of it. :Rockon:
 
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