Haynes Forums - Tubular chassis?

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- Chassis (http://www.haynes.co.uk/forums/forumdisplay.php?f=4)

- - Tubular chassis? (http://www.haynes.co.uk/forums/showthread.php?t=5044)

Oily	20th September 2010 02:55 PM

Quote:

Originally Posted by 3GE Components (Post 45258)

Personally, I'd go up a size to 1-1/8" for the main tubes etc etc.

Kind regards

John

Thanks John :)

davidimurray

20th September 2010 03:19 PM

Quote:

Originally Posted by Oily (Post 45257)

Forgot to ask would you do like for like,i.e 1" tube instead of 1" box?

You should calculate the second moment of areas and work out the equivalent stiffness of the round tube relative to the square tube.

Tilly819

20th September 2010 07:52 PM

hi all heres my 2 pence worth

in comparision to a 16swg box chassis such as mine

to make a tubeular chassis it would be worth making it out of 1 1/4in tube which would enable you to drop the guage to 18swg and maintain the same stiffness and also drop the weight from about 52kg to 40kg
however as soon as you drill a hole in tube to say rivit on the floor it will reduce its strength more so then with box
and you have to be alot more accurate in doing so sich you have a curve rarther than a flat
hope this helps
calculations were very quick and very aproximate
tilly

Oily	20th September 2010 09:04 PM

Quote:

Originally Posted by davidimurray (Post 45260)

You should calculate the second moment of areas and work out the equivalent stiffness of the round tube relative to the square tube.

Fancy doing this for me David as my calculus is a little rusty ;)

If I were to use 1" 1/8 tubing I'm guessing I'd have to recalculate all the measurements of each piece?

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