School me on safe recovery and rigging

[Stinkbug]

This is what I use, it's 7/16" with a minimum breaking strength of 52,300 lbs.

https://www.quadratec.com/p/bubba-rope/gator-jaw-716-pro-soft-shackle

Not knocking your choices here but their marketing is targeted towards the more is better crowd. Why stop at 10x the weight of even a tank of a TJ? At some point the laws of diminishing returns kick in or maybe I should say the laws of diminishing wallets...

 

[Captain Phoenix]

Not knocking your choices here but their marketing is targeted towards the more is better crowd. Why stop at 10x the weight of even a tank of a TJ? At some point the laws of diminishing returns kick in or maybe I should say the laws of diminishing wallets...

Once it gets dirty every use damages the fibers and reduces the strength, as does any other minor damage incurred. The higher the starting strength the less likely things like that are to compromise it enough to fail.

 

[mrblaine]

It's not the necessarily the industry that matters, it's the item. Shackles need that safety factor because they deform at a significantly lower weight than they break. The SWL is designed to keep you from reaching the point of deformation. That's why shackles made of different alloys have different safety factors.

In other words, we need to keep them in elastic deformation and out of plastic deformation. The same situation as the bolts that hold the winch down to the bumper. We need to keep them in elastic so they stay stretched and don't allow the winch to move. Do you not find it a bit odd that 100's of 1000's of Warn 9500 lbs rated winches are only held to the winch deck with 4 3/8" grade 5 bolts which only provide 5000 lbs of clamping load when properly torqued? In every use of the winch, the front pair of feet are subjected to shear and compression loads while the back pair are subjected to tension. That means they are right at the rated capacity, full capacity of the winch. Why don't they fail?

 

[WSS]

Can we go little deeper on that subject. It has always bothered me the gr5 bolts. In fact I have replaced mine with gr8. It probably does not matter though (at least on the tension side) as I left the gr5 square nuts.

have I improved my safety factor??

 

[mrblaine]

Can we go little deeper on that subject. It has always bothered me the gr5 bolts. In fact I have replaced mine with gr8. It probably does not matter though (at least on the tension side) as I left the gr5 square nuts.

have I improved my safety factor??

Where did you find gr5 square nuts?

Warn isn't stupid when it comes to the forces placed on the winch frame. We also know that to be true based on the fact that we never see examples of bolt failure and they would be posted in every winch discussion if they were out there. What Warn knows is the gr5 fasteners used to bolt the winch down to the deck are stronger than the cast aluminum winch feet that the square nuts recess into. Make them whatever grade you like, you aren't increasing anything strength-wise over the winch frame itself.

The only difference will be how nice the bolts look if the winch ever breaks all the little feet off.

That also tells us that outside of some moron using a snatch block and tying the second leg back to the winch frame, the winch will never see loads high enough to break 2 gr5 3/8" bolts in tension. (assuming everyone understands that the front two bolts are in compression and the rear pair are in tension during use)

What I would like to see is someone who has the smarts to run a simulation of the forces on the bolts during a high energy winching event. I suspect that the rotational torque of the drum will get very close to negating the tension forces on the rear bolts and balance the forces out to where the front and rear see the same forces in the same or very close to the same direction.

 

[WSS]

I assumed the square nuts were gr5, so when I replaced them, I specified gr5. I ordered them from Mcfadden Dale hardware in Ontario.

Those kinetic phenomena alway have my mind thinking. Every time I sit in a forklift seat, I stare at the 1/8" pins and wonder what share of the load it is carrying.

 

[Nightmare9]

Someone should build one of these and start breaking shit

 

[WSS]

That’s fine good video. Straight forward.

 

[WSS]

Every once in a while, I have to break parts to see why they are/were failing. I have a 100 ton press to assist in the task. Always exciting.