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Unread 05-14-2013, 07:44 PM   #1
lar308
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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.

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.

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.

Thanks for your time, I can answer questions as needed. Ron


Last edited by lar308; 05-14-2013 at 07:54 PM.. Reason: Sorry pics won't load
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Unread 05-15-2013, 08:08 AM   #2
Helldorado Customs
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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.
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Unread 05-15-2013, 08:43 AM   #3
lar308
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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
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Unread 05-15-2013, 10:16 AM   #4
Helldorado Customs
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Quote:
Originally Posted by lar308 View Post
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.
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Unread 05-15-2013, 01:29 PM   #5
lar308
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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
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Unread 10-18-2013, 01:46 PM   #6
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Quote:
Originally Posted by lar308 View Post
I have a YJ I've done some modifications to. I threw together a bumper with 1" anchor points welded front and back.

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.

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.

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.
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Unread 10-18-2013, 06:03 PM   #7
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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
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Unread 10-19-2013, 02:09 PM   #8
kjg26
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Any pics of it mounted on the jeep:
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Unread 10-19-2013, 03:59 PM   #9
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Here's one, I'll get more, Ron
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Unread 10-21-2013, 12:05 PM   #10
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Quote:
Originally Posted by lar308 View Post
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
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1995 YJ "Mabel", 2.5L Muncie SM465 np231j 4.88's HP30 Lockright JK 44 Detroit 33s CJ clip

Actually, it's pronounced "mill-e-wah-que" which is Algonquin for "the good land."
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Unread 10-21-2013, 05:11 PM   #11
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Here's the other pic's.

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Unread 10-21-2013, 05:17 PM   #12
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