what are some good sites, books....... to look at
and what is the point of doin this?

 

NM i found what the dimpled sheetmetal is
"These buttresses first appear to be "double front down bars" with a large perforated gusset connecting the two." from that site just was too lazy to read

ima still lookin for sources for info on cage design

 

http://e30m3performance.com/te...m.htm

Anyone know if you can buy those "buttresses"?

 

just get some sheetmetal and some Dimple dies

http://www.akfabshop.com
already lookin at that page


Modified by BenMara at 5:38 PM 7/25/2003

 

Go to Improvedtouring.com and do a search on it, that is where I got the ideas for my cage...good luck

 

Ima just lookin for general Cage theory and design not just for car all aspects even Baja 500, ect.....

 

The only things that you really need to know about cage design (or "space frames" more generally) is that (a) corner joints should be assumed to be pivots, without any strength of their own, and (b) tubing is WAY stronger in tension (pulling) or compression (pushing in from the ends) than in bending. These understandings result in the process called "triangulation" - putting diagonals across rectangular bays to create triangles.

This takes a bay that can "lozenge" or go from being a rectangle to a parallelogram and put an element in there in tension/compression, making it way stiffer. Do that in three dimensions and you have a good structure.

The gusseted A-pillars make those elements WAY stiffer in bending, since it is hard to triangulate that piece. It is not, however, impossible.



Get a hot glue gun and a bunch of bamboo skewers and model some rollcages. It will do a LOT for your gut understanding of what makes them strong.

Kirk

 

ben, what is more to understand about a rollcage after satisfying the rules and minimal safety requirements, then just making the chassis as stiff as possible. its no different than conventional truss mechanics.

but the gussets as pointed out are welded to the pillar to give extra points of attachment between the chassis and rollcage.

 

Well ima not staying into makin cages for road cars and what not thats why i was askin for the Roll cage design aspect i am already lookin at a tubing bender but its leaning towards making a cage for my offroad toy

 

Go to my signature and look my CRX build pictures. It shows my cage to its entirety. Hope it helps!

 

gonna put a cage in the civic ben???

 

not exactly more like a roll cage for a 4x4 but ihavent forgoten about the civic
its get quaife and toda flywheel/clutch kit very soon mayb ATS fd if i have some money left over

 

mmm tube bender

 

The only "resource" I can think of offhand would be one of the Milliken Brother's books:

http://www.millikenresearch.com/books.html

Beyond that I think that cage design and construction is 1/5th Physics, 1/5th engineering and 3/5ths art. There is no real "template" for cage and chassis design. You can't really take a book and duplicate a cage by folowing an instruction manual.

Do what Kirk said - get cheap materials and start building models.

 

thats the one i boought (JD Squared right). The degree wheel is a bit of a pain in the *** to install properly.

I havn;t had time yet to start messing around with tube bending/cages, but the constrcution of the bender is supurb. All peices are thick, heavy steel. Super nice people to talk to as well

 

umm ive just been lookin at benders havnt goten one yet
that one is from MtechSupply MtechSupply

 

would that be strong enough to bend a cage

 

a tire wall at 120

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BenMara &raquo;</TD></TR><TR><TD CLASS="quote">what are some good sites, books....... to look at
and what is the point of doin this?
</TD></TR></TABLE>

Bending loads: bad
Larger cross sectional moment of inertia: good

i.e. bent tubes are inherently weak, but you can compensate by gusseting them.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cstay &raquo;</TD></TR><TR><TD CLASS="quote">would that be strong enough to bend a cage</TD></TR></TABLE>

Of course, with a cheater bar on it.

 

My quick review of the web site did not see the words "mandrel bend" or "roll bar/cage" anywhere in the article.

Anagin just a quick look.