roll cage tubing
Capton Bill
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Is 1.5 inch .095 tubing to thin for a roll cage its the only bender I have and would like to save money and build my self
roll cage tubing
- Thread starter Capton Bill
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Incommando
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Stock '91 MJ 4.0/2wd parts runner
Lots of debate on this but if it is HREW or DOM .120 is about the minimum. Chrome moly can go as thin as .080.
AussieCJ7
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most motor sport governing bodies have roll cage specs on their site that have a fair bit of thought and engineering put into them
here is the Australian Cross Country Drivers Association ones, this the governing body that covers 4x4 events such as outback challenge
http://www.ccda4wd.com.au/images/RolloverProtectionDrawingMaster060428.pdf
here is the Australian Cross Country Drivers Association ones, this the governing body that covers 4x4 events such as outback challenge
http://www.ccda4wd.com.au/images/RolloverProtectionDrawingMaster060428.pdf
IOPort51
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It's heavy enough for the stock car crowd, they have no standards for roll bar size or thickness.
i would say it had a lot to do with design. a good design cold use .o80 HREW and a bad design would be doubtful with drill stem.
I am using 1 1/2" .095 for the front extention of my stock 2" roll bar and have no reservations about it. It's primary purpose is to be a grab point to help hoist myself into the seat but I calculate it will hold up as well as the body it is mounted to in a low speed get off.
i would say it had a lot to do with design. a good design cold use .o80 HREW and a bad design would be doubtful with drill stem.
I am using 1 1/2" .095 for the front extention of my stock 2" roll bar and have no reservations about it. It's primary purpose is to be a grab point to help hoist myself into the seat but I calculate it will hold up as well as the body it is mounted to in a low speed get off.
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Minimum 1.750 x .120 wall DOM Mild steel and 1.625 x .083 chrome moly. Either one of those sizes would also have to be supported by other bracing if the cage were to be SFI certified. Pay attention to where you can mount the cage to the chassis or near it..........that seems to be the biggest downfall in Jeep cages is that for the most part people mount them to the sheet metal floor or rear tubs where there really is no strength nor resistance to failure in the event of a rollover.
1.500 is to small.
hagar
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tarry99;118424} Pay attention to where you can mount the cage to the chassis or near it..........that seems to be the biggest downfall in Jeep cages is that for the most part people mount them to the sheet metal floor or rear tubs where there really is no strength nor resistance to failure in the event of a rollover. [/QUOTE said:
Old Dog
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No pix but I have seen one of them rip out of the sheet metal.
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Hagar,
The thread was started by Capton Bill who has listed a 62 CJ3b as his vehicle, No factory roll bar was available in 1963..........In the early years as I noted they were attached to the sheet metal floors in front and the hoop over the wheel tubs.....I have seen plenty of failures when an Early Jeep has rolled over. The later AMC versions had a decent attachment point behind the drivers and passenger seats that picked up the frame in the corners.- Posts
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Hi Old Dog,
Yes I have seen a few lay over even the factory AMC later style Hoop versions.
IOPort51
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Once again guys, we are talking about design not tube size.
I would be willing to bet lunch that the weight of a CJ could be balanced in compression on a beer can, it's just a question of putting the force in the right plane. Now I am not suggesting that beer cans make good roll bars although I have seen them make truly remarkable high impact , energy absorbing bumpers.
Static structures are a question of vector calculations with respect to compression and tension. These can be accomplished with some pretty light materials. Using NHRA or F1 standards would be saying that you were planning to hit the wall at 200+ MPH which isn't very likely. The design of a roll bar would depend on a number of factors much more pressing than tube size, in fact I would say that the design could be adapted to pretty much any material available once the demands of load and impact were established.
To capton bill I say go for it!! If you are going to do "seat of the pants" design on this project, and I see no reason not to, if something looks too small, double it. Use two bars across the top instead of one. If you can, tie the thing into the frame. If you have a supply of 1 1/2 inch tube and a bender, I say have at it, take lots of pictures and tell us what you learn.
I would be willing to bet lunch that the weight of a CJ could be balanced in compression on a beer can, it's just a question of putting the force in the right plane. Now I am not suggesting that beer cans make good roll bars although I have seen them make truly remarkable high impact , energy absorbing bumpers.
Static structures are a question of vector calculations with respect to compression and tension. These can be accomplished with some pretty light materials. Using NHRA or F1 standards would be saying that you were planning to hit the wall at 200+ MPH which isn't very likely. The design of a roll bar would depend on a number of factors much more pressing than tube size, in fact I would say that the design could be adapted to pretty much any material available once the demands of load and impact were established.
To capton bill I say go for it!! If you are going to do "seat of the pants" design on this project, and I see no reason not to, if something looks too small, double it. Use two bars across the top instead of one. If you can, tie the thing into the frame. If you have a supply of 1 1/2 inch tube and a bender, I say have at it, take lots of pictures and tell us what you learn.