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08-23-2014, 01:01 PM | #1 |
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Thickness of box and round frame tube.
I am on the last stretch of building my truck after I get it on the road and enjoy it for a bit I want to build a complete chassis for it while its in use.
I have always used 3/16 square/rectangle tube or 1 1/4 round tube. I want to be able to bend the round tube. So my question to build a complete frame how thick of material should be used. I want the main chassis to be rectangular tube and k member ect to be round. Thanks Jake
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08-23-2014, 05:35 PM | #2 |
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Re: Thickness of box and round frame tube.
I am no expert but I have seen many builds on here and other site where they run .120 wall with rectangle tube. If you look at back half kits they are usually the same thickness.
They height of the frame plays a big factor though.
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
08-23-2014, 05:42 PM | #3 |
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Re: Thickness of box and round frame tube.
The truck will have air ride front back.
Jake
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08-24-2014, 01:57 PM | #4 | ||
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Re: Thickness of box and round frame tube.
Quote:
Quote:
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08-24-2014, 05:24 PM | #5 |
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Re: Thickness of box and round frame tube.
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61 Ford uni http://67-72chevytrucks.com/vboard/s...d.php?t=623422 ryans 77 c10 http://67-72chevytrucks.com/vboard/s...d.php?t=626594 |
08-25-2014, 06:37 AM | #6 |
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Re: Thickness of box and round frame tube.
If not running a cage in the truck 2X6 would be better. Will be closer to the stiffness of a stock frame and will have a lot less flex than the 2X4.
Jimmy
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60 to 66 Chevy and GMC window decals http://67-72chevytrucks.com/vboard/s...d.php?t=661131 Good friends, good food and a hotrod what else do you need? 1966 BBW long fleet Daily driver 1965 BBW short fleet Sold and going to a good home 1965 Suburban 2003 3500 Duramax 2005 Ultra Classic |
08-28-2014, 05:51 PM | #7 | |
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Re: Thickness of box and round frame tube.
Quote:
thanks jake
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08-28-2014, 07:28 PM | #8 |
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Re: Thickness of box and round frame tube.
If you are running 1/8 wall 6 would be good. If you were doing 3/16 I would do 4.
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David Used parts build: http://67-72chevytrucks.com/vboard/s...d.php?t=638991 My brother's Nova: http://www.67-72chevytrucks.com/vboa...d.php?t=727985 Rear suspension rework: http://www.67-72chevytrucks.com/vboa...d.php?t=750557 Instagram: myfabguy |
08-31-2014, 04:48 PM | #9 |
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Re: Thickness of box and round frame tube.
Ladder frames have terrible torsional strength because they have no height and little connecting the two sides. Most of the stuff offered out there for custom frames is .120 wall 2x4 and it's pretty flexy but has OK beam strength. I would do .120 2 x 6 mostly so you can make your cross members taller and try to get some torsional strength. If you are not trying to make stiff suspension work correctly then maybe it doesn't matter to you. Some air springs end up with a pretty low rate so torsional strength may not matter as much.
I would be curious how many pounds/degree a stock 60's truck frame would come in at in a torsion test. I bet it's about 900lbs/degree. A modern sedan is around ten times that and they handle as such.
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