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10-27-2013, 01:20 AM | #801 |
Scooby Specialist
Member#: 193189
Join Date: Nov 2008
Location: Alabama
Vehicle:2006 Impreza Black |
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10-27-2013, 03:17 AM | #802 |
Scooby Specialist
Member#: 272090
Join Date: Jan 2011
Chapter/Region:
MWSOC
Vehicle:2006 Subaru Forester SGM |
i would put a another bar in there foing from the front inner corner to the outer diagnol bar for strength regardless of the wall thickness of your tubing. trust me on this one.
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10-27-2013, 03:57 AM | #803 | |
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Member#: 193189
Join Date: Nov 2008
Location: Alabama
Vehicle:2006 Impreza Black |
Quote:
Why? numerous cars run a-arms just like that with thinner wall tubing. its .095 dom tubing. |
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10-27-2013, 07:03 AM | #804 |
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Join Date: Jan 2011
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Looks good.
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10-27-2013, 09:53 AM | #805 |
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How did you decide on the a-arm mounting points... If done wrong your caster will change when braking and will do the opposite when on throttle, what angle did you set it to and what's you reasoning, I plan to do this also, so I just want to pick your brain.. haha
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10-27-2013, 02:31 PM | #806 | |
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Member#: 193189
Join Date: Nov 2008
Location: Alabama
Vehicle:2006 Impreza Black |
Quote:
same as stock, both mounting points are just lower.... reason why i had to change the control arm length to correct the steering geometry. |
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10-27-2013, 04:07 PM | #807 |
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Ok sounds preset reasonable
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10-28-2013, 08:38 AM | #808 |
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Member#: 135812
Join Date: Dec 2006
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NESIC
Location: Griswold, CT
Vehicle:90 Miata 04 Evo Rally Car |
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10-29-2013, 01:53 AM | #809 | |
Scooby Specialist
Member#: 272090
Join Date: Jan 2011
Chapter/Region:
MWSOC
Vehicle:2006 Subaru Forester SGM |
Quote:
not to say this would ever happen... but lets say a weld started to fail(knock on wood it never does) somewhere in the a arm atleast theres an additional brace in their to aid against complete destruction. ive see numerous tubular a arms fail over time(even with "great" welders) great progress none the less and glad your healing well..... p.s i have the same magnets haha. |
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10-30-2013, 12:23 PM | #810 |
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What tubing did u end up making the subframe and tranny mount out of?
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10-30-2013, 01:10 PM | #811 |
Scooby Specialist
Member#: 193189
Join Date: Nov 2008
Location: Alabama
Vehicle:2006 Impreza Black |
dom .156 wall... trans mount 095
Last edited by TyConway; 10-30-2013 at 01:37 PM. |
10-30-2013, 11:08 PM | #812 |
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MAIC
Location: Hanover, PA (17331)
Vehicle:2007 FSXT |
nice work ty I wish I could weld and calculate like you! I would be out in the shop doing this in a heartbeat!
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10-31-2013, 06:47 PM | #813 |
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Location: The land of BEER and Cheese
Vehicle:2003 WRX WRB |
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11-02-2013, 10:10 PM | #814 |
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Member#: 185910
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MAIC
Location: Hanover, PA (17331)
Vehicle:2007 FSXT |
Maybe I will go over my dad's and start learning how to do it. It's just a Eastwood Mig175
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11-02-2013, 10:56 PM | #815 |
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Vehicle:2016 Focus RS stock |
wow this looks like its gonna be a beast!
Mind if i ask what you do? always curious what you guys who do most of the work yourself do for a living. I like to think of my car building as a hobby and i dont have the knowledge to ever undertake something like this. I am guessing you have a lot of experience with this sort of stuff haha! |
11-02-2013, 11:33 PM | #816 |
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[quote=TyConway;40842613]finally got around to building the new A-arms for my car...
Hate to give negative input on what is very nice workmanship.... It is not good practice to use rod end spherical bearings in a way that puts bending loads on the threads. The threads are stress risers. Cyclical loads on them will invite failure. They are designed to be loaded in a straight line in almost pure compression and tension. You can get away with it on an upper arm and on a light car, but the rod end at the lower ball joint location will have both the spring and shock loads as well as braking and acceleration forces on it. The forward inner rod end is close to ideal, the rear inner one will have some bending load on it and is not ideal, but the outer LBJ one looks scary to me. Last edited by jdogma; 11-02-2013 at 11:42 PM. |
11-03-2013, 01:53 AM | #817 | |
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Join Date: Nov 2008
Location: Alabama
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[quote=jdogma;40883083]
Quote:
they are rated at a static load of 20K lbs.... I run these on rock crawlers and never had one fail, and thats bashing off rocks. If I felt like something was going to fail, i wouldnt use or run it on my car. I made that one a-arm for mock up, still waiting on my ball joints to come in, Like the ones used on TSSfab control arms. Also tssfab that does cradles and control arms for wrx's runs an arm similar to my first ones and the heims side ways... My buddy is a mechanical engineer and works at motion industries and they can test failure points, I'll get him to test an A-arm and a heim and see what the breaking points are. also hes the one that built the lower ball joint adapters. Yet i wonder if anyone ever has looked at how tiny factory ball joints and tie rods are on cars... just like the stamped sheetmetal a-arms found on wrx's and several other cars. Last edited by TyConway; 11-03-2013 at 01:19 AM. |
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11-03-2013, 01:58 AM | #818 | |
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Quote:
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11-04-2013, 02:40 AM | #819 | |
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[quote=TyConway;40883407]
Quote:
I would like to see test methodology and results of any tests, but my main concern is cyclical loading, the back and forth bending of the threaded portion over a long period of time. My guess is that a few hours at the track will not break them, but after a couple of years and a bit of corrosion... Suspension has been a focus of mine for many years and that's my take. |
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11-04-2013, 12:01 PM | #820 | |
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Member#: 193189
Join Date: Nov 2008
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Vehicle:2006 Impreza Black |
[quote=jdogma;40888231]
Quote:
Yes thats your opinion on it, I see what your saying but I don't think thats the case here.... Numerous companies sell A-arms and suspension components that run heims and unicups just like I'm going to do. I yet to see how a hd suspension component is just going to break, after stock components not near the strength hold up after years of neglect and abuse. Also there isn't any more than a 1/4" of thread showing out of the bung. There is 1.25" of thread treaded in. The thread is 5/8" thick. Also on the rock crawlers / buggies we have built, when a heim gets damaged or worn, its pretty easy to notice it by feel or noise alone. If I had an issue causing my car to drive funny, i'd check it out, not keep driving. I do routine maintenance fairly often. |
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11-04-2013, 12:07 PM | #821 | |
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Join Date: Nov 2008
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Yea once you get the basics, then your good to go, learn as you go mainly. I didn't pick up a welder until i was 16 in shop class... I loved wood working and never got into metal working until the shop teacher made me do some welding tests and it was all down hill after that. |
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11-04-2013, 01:10 PM | #822 | |
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[quote=TyConway;40889990]
Quote:
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11-04-2013, 02:10 PM | #823 | |
Scooby Specialist
Member#: 193189
Join Date: Nov 2008
Location: Alabama
Vehicle:2006 Impreza Black |
[quote=jdogma;40890514]
Quote:
Like i Said earlier, heims on the end are for mock up, i can turn them out and in to get the correct length for the camber and so on. Also a heim and bung are cheaper to mock up with over a 50 to 100 dollar unibearing kit. I'm running unicup on the outers. My order of metal has been on back order for 2 weeks due to a band saw breaking at stockcarsteel.com. The reason why I haven't been able to finish up my a-arms, just had enough dom left over to build one A-arm. Also there isn't any spring or shock mounts on my lower a-arms. the strut connects to the spindle. |
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11-04-2013, 03:25 PM | #824 |
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" I made that one a-arm for mock up" - understand now, I missed that!
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11-21-2013, 07:26 AM | #825 | |
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Quote:
Great work otherwise! |
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