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ryanspeed
| | Posted on Tuesday, June 18, 2002 - 02:36 pm: | 
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I designed some front recovery points and had a fabricator make them for me. I was going for a stock looking piece that I could attach a recovery strap or a winch cable from another vehicle. I think that these are way stronger than Jate Rings and could probably individually support a recovery, but I still plan on using a bridle. They are 1/2" thick with 1/2" grade 8 bolts attaching them to the frame through the bumper bolt holes. The front bumper has to be trimmed and the holes have to be drilled out larger.
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ryanspeed
| | Posted on Tuesday, June 18, 2002 - 02:39 pm: |
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Sorry, pics didn't come through.
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Mike B.
| | Posted on Tuesday, June 18, 2002 - 10:31 pm: |
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I don't think the frame of a Disco is a strong as you think it is. The front horns are designed to be thin so they will give in a crash rather than bending the entire frame.
You can easily wallow out (oblongate) the holes on the frame. With your design, you are putting all of the force of a recovery on one side of the frame and introducing a twisting motion with each recovery. In contrast, Jate rings distribute the force on both sides of the frame rail, thus it puts less stress (sideways torque) on the frame rails.
Also, the existing bumper mounts on the frame rails are reinforced. Drilling out the frame only weakens the reinforcements.
Using the bridle is a good idea. I'd be very careful using those mounts for heavy duty recoveries.
Thanks,
Mike B. |
ryanspeed
| | Posted on Wednesday, June 19, 2002 - 12:37 am: |
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The holes in the bumper were the only ones that were drilled bigger, the frame holes had enough play so that they needed no modification.
You're right about the frame being weak, but unless someone welds an I-beam underneath there will always be a weak point in the system. The key is to not exceed that weak point.
There have been numerous posts on this list about the lack of front recovery points with the stock front bumper. I think that this group of people is looking for something similar. If I were to bolt on an ARB bar, there would then be issues of rotation and crushcan deformation. The Jate rings that are avaliable are far weaker than these, and mine are also many times stronger than the stock POS single recovery point. I would rather bend my frame slightly than loose an eye and have a huge dent in my hood when the Jate ring breaks. There will always be something bigger and better that can be made, but the application must be considered. Alot of people on this list do "intentional" offroading where they push the limits of their trucks and frequently end up stuck. My particular situation is that I use my truck for work in the desert and hunting where there is potential to get stuck, but I try to avoid it.
Hopefully I won't have to make many heavy duty recoveries, but if I do I think that these can handle it. If my frame bends...shit happens, but I hope that that is a wost case scenario.
Thanks, Ryan |
Frode H�bertz Haaland (Discofrode)
| | Posted on Wednesday, June 19, 2002 - 02:35 am: |
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Good posting, Ryan, nice to see other peoples designs. Using a bridle will help matters (which you should always do anyway, then it's always a matter of how well you're planning to get stuck...
An improved design would incorporate three - 3 - bolts, thus spreading the forces better. On D1 you use the PAS-pump bolt on one side, and on the other side where englishmen keep their PAS-boxes. As soon as I finish repairs, I will continue with my recovery/hi-lift/steering guard (see Otto's pages) - now I got my template finished, but there's so many lures - so little time, so many repairs, so little time for looking forward!
Frode |
Greg P. (Gparrish)
| | Posted on Wednesday, June 19, 2002 - 08:42 am: |
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Why not just take your design and and put a duplicate bracket on the other side of the frame, then connect with an extremely large grade 8 or better bolt. You could simply attach your shackle to the bolt. This would distribute the weight accross both sides of the frame and would still be relatively cheap. The bolt of that size should be as strong as those shackles. |
Paul T. Schram (Paulschram)
| | Posted on Wednesday, June 19, 2002 - 09:32 am: |
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We might wish to rethink the use of grade eight bolts in this application. Due to the hardness of the bolts, there is a likelihood of them shearing under load. I use grade five bolts in all applications such as this, expecting the grade five bolts to stretch rather than snap. I would much rather have a bolt stretch and gently fail (or allow me an opportunity to observe the impending failure before it happens), rather than violently shear.
My front recovery points are attached using 5-1/2" long grade five bolts through the frame. I buy them at Tractor Supply for about $0.50/lb.
YMMV
Paul |
Greg P. (Gparrish)
| | Posted on Wednesday, June 19, 2002 - 09:38 am: |
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Good point, Paul. I agree and it makes sense. I do still think that two of his brackets with the grade 5 bolt as you mentioned would be a good alternative to jate rings. |
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