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-   -   Anchors away (http://www.jeepforum.com/forum/f37/anchors-away-1523460/)

lar308 05-14-2013 06:44 PM

Anchors away
 
I have a YJ I've done some modifications to. I threw together a bumper with 1" anchor points welded front and back.
http://i286.photobucket.com/albums/l...3/PICT0019.jpg
I like the anchoring to the side of the frame using the 3/4" holes with grade 8 bolts. I have built a new bumper.
http://i286.photobucket.com/albums/l...PICT0021-1.jpg
The side mounting plates are 1/4" thick.
So my question is how thick does the side plates need to be so they can be used as a recovery point when anchored to the frame as opposed to being welded and anchored with 6 bolts as with production bumpers.
http://i286.photobucket.com/albums/l...3/PICT0020.jpg
Thanks for your time, I can answer questions as needed. Ron

Helldorado Customs 05-15-2013 07:08 AM

Great looking bumper ! Looks very similar to the ORFab bumpers.

I've seen this a few times on different bumpers on the market, and while I've not built that design I would suggest something at a minimum of 3/8". Not even as much from a strength of pull force, but from a flex point of view. 99 percent of the time....your anchor pull is never 90 degrees perpendicular to the anchor point base. Because of this, the force (pull) will be applied from an angle not at the strongest plane.

Long story short, and why clevis mounts are so thick usually...is to handle the load without wallowing out the clevis hole or bending/flexing under load from an angle other than exactly 90 degrees to the bumper.

lar308 05-15-2013 07:43 AM

Thanks for the reply. I was thinking 1/2 minimum maybe 3/4. I looked a lot of different bumpers, most were single tube mounted to a plate. They looked like an after thought as far as mountings and tow points. I need a lot more practice on notching tubing on a compound angle. Thanks again, Ron

Helldorado Customs 05-15-2013 09:16 AM

Quote:

Originally Posted by lar308 (Post 15435058)
Thanks for the reply. I was thinking 1/2 minimum maybe 3/4. I looked a lot of different bumpers, most were single tube mounted to a plate. They looked like an after thought as far as mountings and tow points. I need a lot more practice on notching tubing on a compound angle. Thanks again, Ron

I've seen a couple ARB bumpers that use this design(tow point also mounting plate) and theirs are at the 1/2 to 3/4 thickness.

lar308 05-15-2013 12:29 PM

Thanks again, I figured with the 6, 1/2" bolts and 4, 3/4" bolts, all grade 8, the weak point won't be the mount. Thanks, Ron

ldso 10-18-2013 12:46 PM

Quote:

Originally Posted by lar308 (Post 15434117)
I have a YJ I've done some modifications to. I threw together a bumper with 1" anchor points welded front and back.
http://i286.photobucket.com/albums/l...3/PICT0019.jpg
I like the anchoring to the side of the frame using the 3/4" holes with grade 8 bolts. I have built a new bumper.
http://i286.photobucket.com/albums/l...PICT0021-1.jpg
The side mounting plates are 1/4" thick.
So my question is how thick does the side plates need to be so they can be used as a recovery point when anchored to the frame as opposed to being welded and anchored with 6 bolts as with production bumpers.
http://i286.photobucket.com/albums/l...3/PICT0020.jpg
Thanks for your time, I can answer questions as needed. Ron

Never saw it mocked up, looks sweet! You did some nice work man.

I have wondered about that myself, how thick the clevis mounts should be for recovery.

lar308 10-18-2013 05:03 PM

I've tested the anchor points with small pulls, cherokees and such. Seems to be holding up well, I may increase the thickness on the next one. Ron

kjg26 10-19-2013 01:09 PM

Any pics of it mounted on the jeep:

lar308 10-19-2013 02:59 PM

Here's one, I'll get more, Ron
http://i286.photobucket.com/albums/l..._486_sized.jpg

ldso 10-21-2013 11:05 AM

Quote:

Originally Posted by lar308 (Post 16954794)
I've tested the anchor points with small pulls, cherokees and such. Seems to be holding up well, I may increase the thickness on the next one. Ron

HAHA small pulls, little Cherokees :)

lar308 10-21-2013 04:11 PM

Here's the other pic's.
http://i286.photobucket.com/albums/l...PICT0005-2.jpg
http://i286.photobucket.com/albums/l...PICT0004-2.jpg

lar308 10-21-2013 04:17 PM

http://i286.photobucket.com/albums/l...PICT0003-2.jpg


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