My pto winch boom moving cable lockers

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peteinjp

peteinjp

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Had a ton of fun getting this made and using this weekend. I made it just for moving the lockers from storage to home but figured it would come in handy from time to time for other stuff as well. Pretty simple using hardware that is all rated for 1 ton. The boom is raised and lowered with the come a long where as the pto winch is used to lift the load. Forgot to pump up the tires the first time and could barely turn the wheel. 60 psi solved that problem. I had the boom on and had to run out tot he grocery store- it ws dangerous for sure but not because on my part. There were so many double takes from other drivers that I'm sure it would cause an accident.
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In action:
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That is fantastic. I was just looking at the mini in my garage on the weekend thinking, "how am I going to pull that motor? I don't want to buy an engine hoist or have it taking up space..."

Ta da!
 
Ingenious :clap:
 
Awesome.

Though I'm shocked the D-rings you've got attaching the cable stays to the frame held up. They're probably seeing well over a ton with that geometry.
 
How would you calculate that? The rings are rated for about 500kg each. Clearly if the boom were vertical the weight held by the rings would be equal to the weight of the load. As the angle is increased the load is multiplied but how much?

The rings suffered no damage. The listed weight is the WLL.
 
The attachment point is a concern. Unless that angle is welded you are trusting in the shear strength of the bolt. I'm a crane operator by trade and have seen rigging failure. There will likely be no warning so don't trust it and please don't work under any suspended load. Study some gin pole designs and try to incorperate at least a 3:1 safety factor in the design, meaning the rig will support at least 3 times the maximum intended load.

Tim
 
Johnny- that is the link I was looking for! I found that randomly before and I could not find it again. Credit goes to 4low for the idea.

The way I figure it the weight of the axle x 8 should be about what the d rings are seeing. With an approximate weight of 140kg (300#) is is over a ton at 1120kg. With the Wll it should be ok- BUT we treated it as if it might fall at any time.

The way I estimate the load on the boom cable is to take the distance of the line perpendicular to the boom from the pivot point of the boom to the cable and divide the length of the boom by that just as if it was a straight lever. That puts the leverage at about 8 to 1.

But this way of estimating is flawed for sure as when the boom is vertical it can not be applied.

I think the ideal set up would be a boss welded on that would except a 1 ton shackle for each leg of the cable. But this works for me as i will not be using it for heavy stuff very often.


Edit: Aftera bit of looking around it seems that the load characteristics are different than I had thought. See page 10:

https://docs.google.com/viewer?a=v&q=cache:j3JytdkaJ_wJ:www.iadc.org/committees/rigmoving/Documents/Gin%2520Pole%2520Truck%2520Guidelines%2520initial%2520issue%2520march%25202010.pdf+&hl=en&pid=bl&srcid=ADGEESiJxPMR2wqqtkgA3WCXLQGLpqLaaa6Xa5k_w6-kbd518kkOTQfDllS2bzzE5CDLWH7TeQho4DbIKUR-ndtxafTFPgvZ0vs0z8lc5Fmvzk1pFTgK5GQQRISiy_c9OKCGv4ISO8U8&sig=AHIEtbSHl4PqOMV3OsFBJ-6Ex6yW_MVyfQ
 
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My major criticism is that your bezel is missing. ;)

Rather than eyelets on the front of the bumper, I might have gone with 1/4 inch "L" bent steel with a hole it it to accept the rod you are using to support the winch. It accepts more sheer forces. Just MHO.

Also, I'd have doubled the cable screw tightening links (or whatever you call them), that attach to the base of the PTO construct in order to prevent catastrophic failure (cables resist more force than chain links).

Overall, I think you did a nice job. My PTO for my 55 has arrived, and once the 55 arrives, I believe I will use your construct as a basis for mine.

Thanks for posting! Interesting thread, with interesting links to another similar device.

Best,

T

P.S. - It's nice to see another Red BJ-44 out there. Where did you import yours from. Mine is from Japan, then New Zealand.
 
the bezel isn't missing but the chrome horizontal bars are..
and where did he import it from? Did ya look at the background? I"m guessing it's OEM country.. Based on license plate and username.
 
peteinjp said:
How would you calculate that? The rings are rated for about 500kg each. Clearly if the boom were vertical the weight held by the rings would be equal to the weight of the load. As the angle is increased the load is multiplied but how much?
Click to expand...

With difficulty. :D

If the boom angle from the ground is α, then the force applied perpendicular to the tip is F=Load*cos(α).

The angle between the stay cable and the boom, β, is given by β=α-atan[Lsin(α)/(Lcos(α)+x)], where L is the boom length and x is the distance between the base of the boom and the base of the stay.

The tension in the stay cable is T=F/sin(β).

In your case a cruiser axle fully equipped is ~110kg, your boom L=3 meters, the stay is about x=0.5m away from the boom, and the boom is α=45° from the ground.

F=77kg
β=6deg
T=736kg

You've split that onto two Drings, however, so each is getting about 370kg.

I guess I was wrong, then... you're still OK so long as the stay cable fittings before it splits are good for 1.5 tons. But its close... Don't go over any jumps! :D;p
 
amaurer said:
With difficulty. :D

If the boom angle from the ground is α, then the force applied perpendicular to the tip is F=Load*cos(α).

The angle between the stay cable and the boom, β, is given by β=α-atan[Lsin(α)/(Lcos(α)+x)], where L is the boom length and x is the distance between the base of the boom and the base of the stay.

The tension in the stay cable is T=F/sin(β).

In your case a cruiser axle fully equipped is ~110kg, your boom L=3 meters, the stay is about x=0.5m away from the boom, and the boom is α=45° from the ground.

F=77kg
β=6deg
T=736kg

You've split that onto two Drings, however, so each is getting about 370kg.

I guess I was wrong, then... you're still OK so long as the stay cable fittings before it splits are good for 1.5 tons. But its close... Don't go over any jumps! :D;p
Click to expand...

If 736kg is roughly 6.7x the weight of the axle 110kg, then the theoretical max for this arrangement would be 1,000kg/6.7=149kg or 330lbs. and a safe working (3:1 safety factor) load of 110 lbs? So you're not going to pull and engine with it, but that's still pretty good.
 
peteinjp said:
In action:
Click to expand...

Awesome.

here's a pic from about 1998 of me using one I built for much the same reasons......:hillbilly:

I've used it to move 3b's around as well. bit of a bugger to steer with 1000lb's of diesel hanging off there...:lol:

Mine just had some C channel feet welded on that sit on the bumper, then a strong bit of line over to the cage. No problem for axles and such, I get a little more serious about weight when it's a diesel, but it's had 4 different 3b's dangling off it at different times, so seems to work.
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