Need some help on frame bracing |
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bosshoff
Member Joined: 30 Apr. 2012 Location: chicagoland Status: Offline Points: 206 |
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Posted: 21 Feb. 2017 at 4:07am |
Ok, if you are following my build you see that my frame is a mess. I am in the process of cleaning it up. I need to fabricate some support plates for the outside of the frame to strengthen it. There are some cracks and rust, and I think this approach is best. Once I have the bracing in place, I will address the cracks, etc. I am posting a before pic of a bunch of plate that will be removed. I am also posting a pic of a plate I will fabricate. I made the plate template with round edges. Is this better than pointed angles? What about the location of the holes. Each circumference of the hole will then later be welded to the frame to add strength. What about the location of the holes? The number four hole is right over then natural bend in the frame. Do I need to slide this hole over? Lastly, what thickness plate should I use, 1/4"? Thanks.
Edited by bosshoff - 21 Feb. 2017 at 4:32am |
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Chop chop
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nofender
Member Sponsor Member x 3 Joined: 10 May 2016 Location: Maryland Status: Offline Points: 2018 |
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Pattern looks nice. 1/4" would be way overkill in my opinion. I'd go 1/8, maybe 3/16 at most.
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46 CJ2a rockcrawler
46 CJ2a - 26819 46 Bantam T3c "4366" 47 Bantam T3C - 11800 68-ish CJ5 |
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mbullism
Member Sponsor Member x 4 Joined: 29 May 2015 Location: MA Status: Offline Points: 4760 |
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generally curves and circles are better than angles in terms of stress risers... in this case I honestly dont think it matters so long as the point of the angle is at or near the midline and you dont leave a notch when you weld it. Curves are harder for most folks to cut, fit and weld.
You're cutting and fitting this, or applying it over the damaged section?
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Those who do not learn from history are doomed to repeat it... Welcome to 1930's Germany
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bosshoff
Member Joined: 30 Apr. 2012 Location: chicagoland Status: Offline Points: 206 |
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This new plate is going to be "sistered" right up against the old frame.
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Chop chop
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otto
Member Joined: 26 Feb. 2012 Location: Orygun Status: Offline Points: 2241 |
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I would agree with what Mbullism stated with your patch having no sharp corners. Maybe a diamond shaped reinforcement would work in this instance. I worked in a truck shop where we would lengthen/shorten big rigs and this is how we would reinforce a section. Also be restrained from welding this patch in solidly, I would recommend imitating factory welding or welding in a skip stitch fashion. If your patch is too rigid, it will just shift the stress to the next weak spot and crack there.
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47 CJ2A w/fuel injected boat engine
48 CJ2A 64 Ford Econoline Travelwagon If you can't get there in a Jeep, get a motorcycle! |
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bosshoff
Member Joined: 30 Apr. 2012 Location: chicagoland Status: Offline Points: 206 |
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Ok, went to the steel store at lunch and got some 3/16" plate for the sister and 12 gauge sheet to redo the factory boxing.
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Chop chop
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bosshoff
Member Joined: 30 Apr. 2012 Location: chicagoland Status: Offline Points: 206 |
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Progress. Cut in the intermediate M38 crossmember and pintle V-bracket. Used grade 8 bolts. Removed horrible passenger side plates. Found holes and cracks underneath them. I now have to start staging the work in steps. I have to get e side plates welded in to stabilize my frame. Next step is to pull all the new parts off and weld in the new donor rear frame horns/ends. Then weld in inner frame plates to back up the horns. Next reinstall all of the new parts. Weld in the V-bracket. Then fab and replace the rear inner frame boxing. Then weld in the rear upper shock mounts. Then POR-15 time!
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jaybird
Member Joined: 17 Dec. 2016 Location: Alabama Status: Offline Points: 4 |
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that is what i will be doing soon to mine
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Tommy
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bosshoff
Member Joined: 30 Apr. 2012 Location: chicagoland Status: Offline Points: 206 |
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Jaybird, check out my Stealth Maggot build thread for more updates on the bracing.
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jaybird
Member Joined: 17 Dec. 2016 Location: Alabama Status: Offline Points: 4 |
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thanks i need ideas on how to do the repair i think mine is a ford jeep maybe 1943 odd that right side is in good shape but left side bad
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Tommy
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Mike S
Member Joined: 20 May 2006 Location: West Coast Status: Offline Points: 2318 |
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Be sure to measure against specs and check your frame for aquare before you weld in the braciing. A lot of these old Jeeps have frame problems and cracks are just one symptom.
Your work looks good. |
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'47 CJ2A -- #114542
Warn FF D41 rear Lock-Right locker 11" drum brakes Dual master cylinder T90C Transmission 16 X 6 Jeep truck wheels Cooper STT Pro tires |
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