Cockpit tube size/thickness discussion

[yoshi]

Originally Posted by arrowhead

Ordered a batch of 060 X 1.25 4130 tubing and got started.

Did I read that right, is your rail built entirely outa .060 wall tubing?

[Bugpac]

Originally Posted by yoshi

Did I read that right, is your rail built entirely outa .060 wall tubing?

strength is in design yoshi, you know that.... He could certainly put som 1/4 plate work on his a arms, as long as he welds it to the center of the tube and not on the side...


welcome BTW, good looking car IMO...

[yoshi]

Originally Posted by Bugpac

strength is in design yoshi, you know that.... He could certainly put som 1/4 plate work on his a arms, as long as he welds it to the center of the tube and not on the side...


welcome BTW, good looking car IMO...

Design does come first, material second, but the design of the rail doesn't overcome the drawbacks from tubing that thin. It's not just the suspension I would be worried about, it's the roof in a roll, there is not enough bracing to justify .060 wall material, and being that thin has another major drawback which is the welding points, all the material around the heated welds is now more brittle, especially since it's chromo which I doubt was stress relieved after the frame was welded.

[Bugpac]

Originally Posted by yoshi

Design does come first, material second, but the design of the rail doesn't overcome the drawbacks from tubing that thin. It's not just the suspension I would be worried about, it's the roof in a roll, there is not enough bracing to justify .060 wall material, and being that thin has another major drawback which is the welding points, all the material around the heated welds is now more brittle, especially since it's chromo which I doubt was stress relieved after the frame was welded.

Not if he knows what he was doing....There are other people who can build ya know, thin chromo can be welded effectively....

[Bugpac]

The way i see it actually, that .60 wall chromo is as strong if not stronger than your junk .120 wall hrew....

[masterfabr]

This time I have to mostly agree with yoshi. Yoshi and bug have good points but .060 for all components is not a good idea in the long run.IMO only of course. I'd keep a very close eye on ALL welds.

[yoshi]

Originally Posted by Bugpac

Not if he knows what he was doing....There are other people who can build ya know, thin chromo can be welded effectively....

Originally Posted by Bugpac

The way i see it actually, that .60 wall chromo is as strong if not stronger than your junk .120 wall hrew....

With comments and views like that, thank God your not a manufacturer. 1.25 tubing with .060 wall thickness for a complete roll cage is safe to you? Even the little trophy kart manufacturers know better than that, but if you would put your life inside a cage with a so so braced roof line of .060 tubing, thinking it would keep it's shape in a tumble, knock yourself out, we wouldn't have to put up with your un educated comments anymore after the first time you rolled it......

[yoshi]

And nothing against you Dale, I think your buggy looks good, and I don't think your gonna break the tubes at the welds like twigs, I just know that rails with a lot thicker tubing have cracking issues with chromo after extended periods of use, and know that could be a prob. area with the thickness you have gone with. My main concern is the .060 tubing for the roof, there is not enough bracing, nor enough material in the tubing to be very safe in a good tumble, and I can see that roof flattening out fairly quick in an accident...

[Bugpac]

Honda pilots are known to be made with .058 erw, so talk your shit somewere else. this guy probably knows more about metallurgy and welding than your book reading....Safety is not made by building a arms that wont tear off...As you so do, so your the last guy to give safety standards....

[Bugpac]

For the record, chromo is 25% stronger than Dom, Dom is 50% stronger than junkrew, you do the math....