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Soft shackles and kinetic ropes

So the chineez welds failed and yet the sheetmetal (ish) plate held?:eek:?

Who's bumper?

We did see a lexus lx4?? Landcruizer klone... On met almost spit the bumper in similar fashion last trip...
 
Clb said:
So the chineez welds failed and yet the sheetmetal (ish) plate held?:eek:?

Who's bumper?

We did see a lexus lx4?? Landcruizer klone... On met almost spit the bumper in similar fashion last trip...
Click to expand...
Yeah, I need to see how those are mounted, both my buddies have Lexus GX and have the same flex.
 
Clb said:
So the chineez welds failed and yet the sheetmetal (ish) plate held?:eek:?

Who's bumper?

We did see a lexus lx4?? Landcruizer klone... On met almost spit the bumper in similar fashion last trip...
Click to expand...

Looks like a MetalCloak 6G Bronco bumper.

metalcloak.com

Bronco 6G Front Bumper System

Front Winch Bumper for the Bronco by MetalCloak. Rock-Crawling heritage and desert race inspired design with utilitarian functionality. Clearance, Protection Lo-profile winch mount, practical utility with great looks. Features Include: 3/16" Steel Base 2"OD X .125 Wall DOM Tube Lo-profile...
metalcloak.com metalcloak.com
 
aczlan said:
Looking at the pictures from post 75: Soft shackles and kinetic ropes
It looks like the mount started tearing behind the bumper:
1000089479.png

(Arrow points to the front of the vehicle)

Aaron Z
Click to expand...
I am hung up on the word shear, did a hunk of metal actually shear off?
 
welndmn said:
I am hung up on the word shear, did a hunk of metal actually shear off?
Click to expand...
Perhaps ripped or tore would be a better term?
It appears that it ripped/tore/sheared at least halfway through before the bolt jammed in the slot in the bumper. You can see where it ripped/tore/sheared the thinner metal that the clevis mount is bolted to at the back (inside my blue circle, away from the direction the arrow is pointing), the top that looks almost white in the picture is where is ripped/tore/sheared.
Edit: The red lines are the two halves that ripped/tore/sheared apart:
1000089511.png




Aaron Z
 
welndmn said:
I am hung up on the word shear, did a hunk of metal actually shear off?
Click to expand...

I'm not sure if that bracket was welded on or bent, but it looks like it tore 90% of the way off before the face of the bumper caught it with the bolt head.
 
The part that sheared/tore is a bend on the clevis mount.
I was over at his house last night and he is working on a pretty thorough write up of the situation and will share it when he's done.
He is also in a bit of pain and just hanging out with his family for now.
He really wants to make this a learning experience to share and educate people so some good can come from it.
 
Metalcloak is a local company and they generally make good stuff. I looked at their install instructions for this bumper:



The instructions are vague on this part but If this is all there is to the clevis mount, I DO NOT like this: Page 6



1709143994397.png


Not that this failure caused the soft shackle failure or the injury, I just don't like it. I think this is pointing more and more to an outrageous amount of force being put into component's not sized to carry that force.
 
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Clb said:
So that ?what 3/16-1/4 plate was the entire anchor for the pull point?:eek:
Thats effed up:shaking:
Hope he heals quick
Click to expand...
There is a folded over portion on the bottom that is welded and acts as a small gusset:


1709149804568.png

1709150080843.png


I bet you metalcloak could tell us approximately how much force it would take to tear this mount assuming they designed these parts in the appropriate software.
 
That is a bit heavier than the single shear tab.
Who is it here that is metalwork ? Dan?
Still a cringe amount of whoopazz put on it.
 
Most people who design and build a bumper with a clevis mount make that the focal point of each frame rail with all of the surrounding structure tied into it. These seem like an afterthought to make use of the material removed from the plate bolted to the frame horns. They just stick through the outer layer without tying into it at all.

Modular stuff made to ship easily and cheaply and cut out of plate with minimal waste and BOM count.

My jeep is wrapped in metalcloak Armor, I am very happy with it, but I would not buy their bumpers because I don't like that design philosophy.
 
MigGunslinger said:
Most people who design and build a bumper with a clevis mount make that the focal point of each frame rail with all of the surrounding structure tied into it. These seem like an afterthought to make use of the material removed from the plate bolted to the frame horns. They just stick through the outer layer without tying into it at all.

Modular stuff made to ship easily and cheaply and cut out of plate with minimal waste and BOM count.

My jeep is wrapped in metalcloak Armor, I am very happy with it, but I would not buy their bumpers because I don't like that design philosophy.
Click to expand...
Something to keep in mind as well is likely the liability of significantly modifying crumple zones and crash structures on our vehicles. Like it or not, we're a litigious society.

My wife bought her "Fuck Cancer" JLUR and I immediately took it home and cut 6.5" of her frame off and built a 1/4" bumper with a winch tucked in nice and close. I'm certain none of the damage to the frame/mount seen in this thread would occur....but I've effectively changed the front of her Jeep into a battering ram that won't give and will likely injury us and/or the vehicle we hit much more severely than something that is 'bolt on'.

I'd wager that potential liability likely drove the design of the Metal Cloak bumper....at least in part.
 
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Fyi Metalcloak already admitted a few times to not testing some bronco parts. It's a completely different platform and they shouldn't make bronco parts without putting in some leg work. This could be a dead jeep driver thread based on the bumper.
 
Just fired up the laptop so I can see..... I'm not gunna dogpile them .....:lmao: but that looks rather afterthought, to me.So dj how is the driver today?
 
Sean said:
I'd wager that potential liability likely drove the design of the Metal Cloak bumper....at least in part.
Click to expand...
Doubtful. Frame crumple zone doesn't know if it's hitting a brick wall or the back side of a solid bumper.

Snacktime said:
this could be a dead jeep driver thread based on the bumper.
Click to expand...
Cool it with the pearl clutching. You start getting rowdy with a strap and eventually something's gonna break. OEM tow hook probably wouldn't have taken what this did.
 
arse_sidewards said:
Doubtful. Frame crumple zone doesn't know if it's hitting a brick wall or the back side of a solid bumper.
Click to expand...
And neither of us can say for sure what parameters Metalcloak takes into account when designing a bumper. I'll still wager how their bumper will change the crash-worthiness of a vehicle is at least taken into consideration.
 
Beat95yj said:
Personally I’d like to see a much larger fillet where these red lines are.
Click to expand...

I'd still be pretty worried about what they are hooked to. I'm always shocked when I see the transition structure on OEM 'recovery' points into the frame. It's usually like ~6" of weld that holds a ~1/8" thick pressed folded bracket to the end of the frame rail. I see more and more companies making reinforcement brackets for 6G bronco front frame rail structure. Some of the frame flex I have seen from just mild winching is pretty shocking. I know they have a lot of crash standards to work around, but dang.
 
Dirtyjed said:
The part that sheared/tore is a bend on the clevis mount.
I was over at his house last night and he is working on a pretty thorough write up of the situation and will share it when he's done.
He is also in a bit of pain and just hanging out with his family for now.
He really wants to make this a learning experience to share and educate people so some good can come from it.
Click to expand...
Appreciate his willingness to want to share the experience, which will hopefully serve as a good learning for all.
 
Mieser said:
the transition structure on OEM 'recovery' points into the frame. It's usually like ~6" of weld that holds a ~1/8" thick pressed folded bracket to the end of the frame rail.
Click to expand...
Yeah this is exactly what I was thinking when I said that. :laughing:
 
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