Dave's perpetual project
- Devastator
- Posts: 3493
- Joined: Tue Nov 06, 2007 6:51 am
Re: Dave's perpetual project
Good catch. Good pic. Good times!
Devastator's Build Thread
Sandrail
2.4 liter, supercharged Chevy Ecotec
"If everything seems under control, you're just not
going fast enough."
Mario Andretti
Sandrail
2.4 liter, supercharged Chevy Ecotec
"If everything seems under control, you're just not
going fast enough."
Mario Andretti
- TimS
- Posts: 5723
- Joined: Fri Apr 23, 2010 10:11 pm
Re: Dave's perpetual project
Did you pack the welder?
I'm jealous of the weather.
I'm jealous of the weather.
Don’t ever yield your gift of dream; Your knack for gumption, too. For “It’s the crazy ones that have all the fun," if dreamers yearn to do.
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Re: Dave's perpetual project
Glad to hear someone is having fun in their Baja.
BRAT Motorsports #936
Bolt Center: Salt Lake City, Ut
ACE: Air Cooled Engineering, now Black Line Racing
Bolt Center: Salt Lake City, Ut
ACE: Air Cooled Engineering, now Black Line Racing
- Skidmark
- Posts: 3506
- Joined: Mon Aug 28, 2006 7:19 pm
Re: Dave's perpetual project
I have always been a little leery of tubular trailing arms. I never had anything conclusive to back up my preference for boxed arms, that is until now! Glad you didn't have a major failure while driving. It tends to be hard to steer when your rear wheels are not pointing the same direction!
"Your car sounds angry, and it wants to go fast all the time..."
(quote from my daughter, after driving my car)
It's not complicated, it's just expensive...
(quote from my daughter, after driving my car)
It's not complicated, it's just expensive...
- Big Dave
- Posts: 3208
- Joined: Tue May 17, 2005 4:31 pm
Re: Dave's perpetual project
These are the Eagle chromoly arms. The crack is right at the heat affected zone which makes me believe it was improperly welded or heat treated. I should have just gone with heavier DOM.
I don't always show my signature. But when I do, it's in this area.
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- Joined: Mon Nov 13, 2006 10:17 pm
Re: Dave's perpetual project
They mustn't be DOM, they must be DAMN! Another good reason for a pre-trip inspection of all components.Big Dave wrote:I should have just gone with heavier DOM.
Looking forward to meeting you.
Lee
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- Posts: 17758
- Joined: Mon Nov 13, 2006 10:17 pm
Re: Dave's perpetual project
I haven't done any welding callouts for over 50... if I have done any but I do remember looking into it. The term stress relieving post welding was brought up which brought back some memories so, just for giggles, I did a short bit of research:
http://www.welding-advisers.com/Stress-relieving.html
http://www.aws.org/wj/sept01/cullison.html
http://en.wikipedia.org/wiki/Vibratory_stress_relief
http://en.wikipedia.org/wiki/Shot_peening
http://en.wikipedia.org/wiki/Peening
I wonder just how many people remember to do this.
Lee
http://www.welding-advisers.com/Stress-relieving.html
http://www.aws.org/wj/sept01/cullison.html
http://en.wikipedia.org/wiki/Vibratory_stress_relief
http://en.wikipedia.org/wiki/Shot_peening
http://en.wikipedia.org/wiki/Peening
I wonder just how many people remember to do this.
Lee
- woodsbuggy1
- Posts: 820
- Joined: Sun Feb 20, 2011 5:15 pm
Re: Dave's perpetual project
You might want to think about boxing your arms to spread the stress over a larger area and prevent flexing of the tubes. We run 5x5 tubular arms with 12ga material to fill in the upper and lower "windows" we have abused the arms without a single failure.
Good luck
Kenric
Good luck
Kenric
Good quality is getting harder and harder to find.
- Big Dave
- Posts: 3208
- Joined: Tue May 17, 2005 4:31 pm
Re: Dave's perpetual project
When i jacked it up, the gap closed up nice and tight, so after getting it cleaned up, I welded it back together and made a doubler plate for it.
Took the car out and pounded on it for a few miles today with no problems.
In a couple days, we'll load it up and take it to Quartzsite for a week or so. I'm looking forward to finally meeting Lee
Took the car out and pounded on it for a few miles today with no problems.
In a couple days, we'll load it up and take it to Quartzsite for a week or so. I'm looking forward to finally meeting Lee
I don't always show my signature. But when I do, it's in this area.
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- Joined: Tue Jan 22, 2008 10:50 am
Re: Dave's perpetual project
Dam bro good catch quick fix and back at it. That's awesome
I just wanna drive it that's it.
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- Joined: Sun Jan 18, 2009 12:23 pm
Re: Dave's perpetual project
Good job Dave and quick too. Hope to see you at the May BOR race.
- dustymojave
- Posts: 2312
- Joined: Mon Dec 01, 2008 9:08 pm
Re: Dave's perpetual project
I agree to a certain extent with WoodsBuggy1.
I have no issues with whether arms are box or tube. I have seen both types fail. Some tube arms are better than others, some box arms are better than others.
Good gusseting is something I like on arms, tube or box. The point of a gusset is NOT to make a corner more stiff. That just moves a stress concentration point farther up the arm. The joint of the hub plate to the arm needs gusseting so the plate does not mount to the arm in a single plane. And the joint of the spring plate "tab" to the arm also needs gusseting. Those are by far the most common places for arms to fail, regardless of whether box or tube.
As to DOM or 4130...I would rather have a bent arm than a snapped off arm. Thus DOM is my preference for that particular component.
I have no issues with whether arms are box or tube. I have seen both types fail. Some tube arms are better than others, some box arms are better than others.
Good gusseting is something I like on arms, tube or box. The point of a gusset is NOT to make a corner more stiff. That just moves a stress concentration point farther up the arm. The joint of the hub plate to the arm needs gusseting so the plate does not mount to the arm in a single plane. And the joint of the spring plate "tab" to the arm also needs gusseting. Those are by far the most common places for arms to fail, regardless of whether box or tube.
As to DOM or 4130...I would rather have a bent arm than a snapped off arm. Thus DOM is my preference for that particular component.
Richard
Lake LA, Mojave Desert, SoCal
Speed Kills! but then...So does OLD AGE!!
Tech Inspection: SCCA / SCORE / HDRA / ARVRA / A.R.T.S. OffRoad Race Tech - MDR, MORE, Glen Helen BajaCup
Retired Fabricator
'58 Baja with 955K Miles and counting
Lake LA, Mojave Desert, SoCal
Speed Kills! but then...So does OLD AGE!!
Tech Inspection: SCCA / SCORE / HDRA / ARVRA / A.R.T.S. OffRoad Race Tech - MDR, MORE, Glen Helen BajaCup
Retired Fabricator
'58 Baja with 955K Miles and counting
- CentralWAbaja
- Posts: 4278
- Joined: Fri Feb 05, 2010 9:05 pm
Re: Dave's perpetual project
Tap Tap Tap....is this thing on? Dave where did you go?
It is not Mickey Moused.....It's Desert Engineered!