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Old 12-27-2012, 11:52 PM   #1 (permalink)

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Post Roll cage calculator/tubing strength article

Fond this on Pirate4x4, could be a useful tool for choosing tubing.

https://www.roguefab.com/calculator.php

There is also a tech article on benders/bending, and how the use of different radi dies affects the strength of the part.
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Old 12-28-2012, 12:32 AM   #2 (permalink)

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Default Re: Roll cage calculator/tubing strength article

Dont think a whole lot of people are going to agree with their "sample roll cage" design.
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Old 12-28-2012, 05:24 AM   #3 (permalink)

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Default Re: Roll cage calculator/tubing strength article

[quote=Bullnerd;253254]Dont think a whole lot of people are going to agree with their "sample roll cage" design.[/
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Old 12-28-2012, 03:55 PM   #4 (permalink)

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Default Re: Roll cage calculator/tubing strength article

Thats what i said!
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Old 12-28-2012, 04:08 PM   #5 (permalink)

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Default Re: Roll cage calculator/tubing strength article

While its handy to have a formula, deciding what numbers are a good representation of the frame under impact is the hard part (what load value to use). Not to mention the hazard factor, or more commonly known as the safety factor. The grade of steel and manufacturing quality is another large factor. Usually, the load should not go beyond 50% ultimate strength and 67% yield strength for primary loads (bending, axial, etc.). As always, its a bit more involved than a simple formula.....
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Old 12-28-2012, 04:10 PM   #6 (permalink)

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Default Re: Roll cage calculator/tubing strength article

Quote:
Originally Posted by Bullnerd View Post
Thats what i said!
Ha ha. Bull I would say custom agrees???
Ok now I will too. So it's plus 3.

Why would the use a center tube in the pic as "this one"
I see they want and example but I'm sure if they used the out side tube it would be a different article. And more stress that would give different results. Maybe it's early. I will re read it after 3 mountain dews
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Old 12-28-2012, 10:06 PM   #7 (permalink)

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Default Re: Roll cage calculator/tubing strength article

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Old 12-28-2012, 10:16 PM   #8 (permalink)

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Default Re: Roll cage calculator/tubing strength article

Quote:
Originally Posted by Custom39 View Post
Dont think a whole lot of people are going to agree with their "sample roll cage" design.
Quote:
Originally Posted by Bullnerd View Post
Thats what i said!
Quote:
Originally Posted by Chikin1974 View Post
Ha ha. Bull I would say custom agrees???
Ok now I will too. So it's plus 3.

Why would the use a center tube in the pic as "this one"
I see they want and example but I'm sure if they used the out side tube it would be a different article. And more stress that would give different results. Maybe it's early. I will re read it after 3 mountain dews
Here is text straight from the "calculator.php" page:

"This cage is just a simple example for teaching purposes, we don't recommend you build a cage like this."

We made the calculator primarily for comparing materials, but also to look at individual parts of a cage under varying loads that can be manipulated. It is not an FEA package and it is not meant to be a thogough analysis. Most poeple building their own stuff just do what looks good with NO calculations. This is a free step in the right direction. Please don't misinterpret our intentions.

Last edited by RogueFab; 12-28-2012 at 10:28 PM..
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Old 12-29-2012, 01:14 AM   #9 (permalink)

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Default Re: Roll cage calculator/tubing strength article

See,even he disagrees with it!
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Old 12-31-2012, 05:11 PM   #10 (permalink)

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Default Re: Roll cage calculator/tubing strength article

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Originally Posted by Bullnerd View Post
See,even he disagrees with it!
Haha

I am going to put the "roll cage example" farther down on the page and put more emphasis on it being a single-tube calculator (since that is what it is).

I hope you guys can put it to use for comparing things and evaluating what material to build your frames with.

Last edited by RogueFab; 12-31-2012 at 05:19 PM..
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