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ouR escaPOD mods |
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StephenH 
podders Helping podders - pHp 
Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
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 Topic: ouR escaPOD modsPosted: 03 Jun 2019 at 8:57am |
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There is an advantage to having a center support though. When I took off the end brackets (one at a time) to shorten the overhang so the brackets would not be at risk of hitting the arm, it was good to have the center support to hold the angle in place while I was working on the brackets. If I did not have that center support, it would have been harder to do the bracket modification needed. Addendum: I decided to seal along the upper edge of the reinforcing angle, but not the ends. The seal should keep water out and decrease chances of corrosion. The camber should help any water that might get in to drain toward the ends where it should drain at the bottom of the V channel at the end by the arms. I used DAP Dynaflex Ultra Window, Door, Siding & Trim. The color I used is black to match. The product says "Crack Proof, Resists UV Fading & Dirt Build Up, Weather MAX Technology. One thing that helped me decide to use this is the specifications which include Flexibility: Permanently Flexible and Joint Movement: +/- 35%. I used less than a tube for the job.
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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Posted: 03 Jun 2019 at 5:16am |
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The axle isn't a teeter totter, its a double ended cantilever. The stress on the axle is the same everywhere between the two supports. So, to function as cantilevers both the axle and the supporting angle need to run the entire length as continuous parts. if you made the angle discontinuous then yes you would want to clamp it to the axle inboard, but that would just create a high stress location on the axle at that point, so it would bend there instead of at the supports. By making both parts continuous there is no need for clamps except at the ends, everywhere else the angle is supporting the axle because the axle is being bent downwards in the center by the end loads.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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StephenH
podders Helping podders - pHp
Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
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Posted: 02 Jun 2019 at 7:42pm |
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I don't think anyone will accuse me of being an artist, but I'm glad my sketch was helpful. It turns out I do need to trim a little from the outboard side of the brackets on the end. They are too close to the arm and may interfere if they shift even a little. Edit: I did take the end brackets off and removed some of the material to give better clearance for the arm. There is now a distinct 1/4" space between the end of the bracket and the end of the axle tube, which matches the clearance for the reinforcing angle.
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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DavMar
Senior Member
Joined: 04 Aug 2017 Location: Lexington, NC Online Status: Offline Posts: 592 |
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Posted: 02 Jun 2019 at 4:59pm |
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Your simple drawing was like a thousand words, now I understand how you bent the angle iron. Thanks! |
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Dave & Marlene J with Zoey the
wonder dog. 2017 Rpod 180 2016 Toyota Tacoma SR5 4x4 Lexington, NC |
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GlueGuy
Senior Member
Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2630 |
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Posted: 02 Jun 2019 at 3:51pm |
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bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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Posted: 02 Jun 2019 at 3:08pm |
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The main thing you're trying to achieve is to support the axle ends and carry a portion of that load in the angle back to the supports. So if someone wants to try shims the most important place to put them would probably be under the support points. Otherwise the angle wouldn't be in direct contact with the axle there and would probably deflect more than would be desirable. By bending the angle its in more or less direct contact with the axle for its whole length so you don't have to worry about it.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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podwerkz
Senior Member
Joined: 11 Mar 2019 Location: Texas Online Status: Offline Posts: 966 |
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Posted: 02 Jun 2019 at 2:28pm |
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For future reference, wouldn't it be easier to leave the angle stock straight, and then simply weld in an angled 'shim' in the middle of the length?
This shim would apply the upward pressure on the factory axle tube, and the angle will still remain more or less straight along the length from end to end. Just thinking it might be easier for someone else who is wanting to strengthen the axle tube. |
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r･pod 171 gone but not forgotten!
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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Posted: 02 Jun 2019 at 8:21am |
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I saw that video too. Note that they kept the chain to axle angle at about 45 degrees. The reinforcement angle is easier to bend than the axle tube so for what you did its fine. If someone wanted to use that technique to recamber an axle then I'd suggest a wider angle and a chain at least 3x the capacity of the jack.
Re the center clamp, as they used to say back in the '60's, if it feels good, do it!
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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StephenH
podders Helping podders - pHp
Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6289 |
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Posted: 02 Jun 2019 at 7:57am |
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The clearance was my concern as well. I will look at it again and if I think it might interfere, I will take it off and cut a little off to make sure. I had seen one YouTube video of a shop using a chain and hydraulic ram to bend an axle, although I think it was on a leaf-spring suspension. That's what gave me the idea to try it for my brace. I tried to match the capacity of the chain to the capacity of the bottle jack. I definitely would not have wanted to try out a chain with lesser capacity. I know you said the center clamp is not needed, but I feel better having it there. It was also helpful when mounting the reinforcement.
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StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
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offgrid
Senior Member
Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
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Posted: 02 Jun 2019 at 6:53am |
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StephenH, what you've done looks good.
The only concern I have is that looking at the photo it looks like the upper clamp portion doesn't have much clearance from the torque arm. As a reminder, the center clamp is not needed from a structural viewpoint. OTOH it doesn't hurt anything to have it there. The same type of chain and bottle jack approach could be used to attempt to straighten an axle as well, but I would keep the angle between the part being bent/straightened and the chain to around 45 degrees. The shallower the angle the more stress that needs to be applied to the chain to achieve the same bending force. At 45 degrees its 1.4X, and 30 degrees its 2X and at 22 degrees its 3X. Blocking could be used to lengthen the jack and increase the angle if needed.
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1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
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