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Author Topic: Making trailing arms  (Read 12625 times)

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455bird

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Making trailing arms
« on: February 08, 2009, 07:53:50 PM »
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hirevlimit

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Re: Making trailing arms
« Reply #1 on: February 08, 2009, 08:14:29 PM »
Bird I haven't got to run mine yet because it is not finished but here are what mine look like, they are made of .120 wall mild, sorry not as nice as yours but I was wondering if you had any pictures of the bending area as I would like to learn from
this and make improvement to mine before paint.
« Last Edit: February 08, 2009, 08:24:49 PM by Hirevlimit »
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #2 on: February 08, 2009, 08:24:19 PM »
The bends circled in yellow are your problem.  with those in there you have a four sided shape and four sided shapes are not stable.  You need triangles  both horizontal and vertical.  if you replace the bent tubes with the blue line I drew in it would be a lot more stable and then maybe some webbing or something from the lower bars on one sid to the upper bars on the other.
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #3 on: February 08, 2009, 08:25:45 PM »
the blue line is supposed to be straight, not all crooked like I drew it. ;D
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RC51 Rhino

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Re: Making trailing arms
« Reply #4 on: February 08, 2009, 08:42:47 PM »
Hirev...I like your design looks pretty stout. 455 I can see where yours would cause a problem, if they were boxed in or braced, you may not've had the bends...so to speak. I need to look into mine now 'cause I'm unsure of the design!
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Offline Punkur67

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Re: Making trailing arms
« Reply #5 on: February 08, 2009, 10:22:03 PM »
I use 1-1/4 .120 moly for my suspension. Also a plate connecting the two upper tubes would help a ton and you can mount your shocks to it if you want. I bought these arms from a friend and did my own plating and gussets to them. To cheap to pass up and saved me a bunch of work.
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455bird

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Re: Making trailing arms
« Reply #6 on: February 08, 2009, 10:26:12 PM »
Boost you nailed it the yellow circle is where it bent I think on the drivers side. My left wheel is tipping in on the top and giving the CV more angle on the outboard side. Do yours or all you use cro-mo or just DOM?
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #7 on: February 08, 2009, 10:35:27 PM »
rather than starting over, could you just cut those tubes off and put straight ones in like in punkur's pic?
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #8 on: February 08, 2009, 10:36:53 PM »
curves in the tubes are ok, but they have to be placed right at the end of the tube.  when you put them in the middle of the tube, they are more likely to continue to bend when stressed.
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455bird

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Re: Making trailing arms
« Reply #9 on: February 08, 2009, 11:05:12 PM »
The only plating I have is on the top and bottom where the tubs connect to the carrier, what about the curves on the outboard tube where it connects to the carrier marker in red
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #10 on: February 08, 2009, 11:10:19 PM »
if you replace the other ones with straight tubes then that bend would be the next weak link, but plating the top or bottom or both would help to stabilize the bend.
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Offline Engineer

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Re: Making trailing arms
« Reply #11 on: February 08, 2009, 11:12:45 PM »
Quote from: 455bird on February 08, 2009, 11:05:12 PM
The only plating I have is on the top and bottom where the tubs connect to the carrier, what about the curves on the outboard tube where it connects to the carrier marker in red

Those bends are for tire clearance?  If you did like Boostin said then the tubes would be close together for a ways, and easily plated, until they went their seperate ways.
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #12 on: February 08, 2009, 11:17:21 PM »
Quote from: Engineer on February 08, 2009, 11:12:45 PM
Those bends are for tire clearance?  If you did like Boostin said then the tubes would be close together for a ways, and easily plated, until they went their seperate ways.

yes.  I will post a scribble here in a few mins to clarify my thoughts, then you do what makes you happy.
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Offline Boostinjdm

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Re: Making trailing arms
« Reply #13 on: February 08, 2009, 11:25:00 PM »
This is what pops into my head for plating....
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Offline Yoshi

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Re: Making trailing arms
« Reply #14 on: February 09, 2009, 12:07:47 AM »
I use 1.25"x.120 DOM, attached are pics of how mine are setup.

Hirevlimit, your gonna bend those arms...

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