another rollcage question

[truck poor]

Ok, so I've read my books looked at pics, asked alot of questions, saved my pennies and bought a model 3 bender and practiced with bumpers etc. my question for you guys (and girls) is this. when I come to attaching the cage to the frame, insted of bending the tubing making it slant in toward the frame could I make "nerf bars" under the cab and just go straight down thru the floor and attach at that point? hope that makes a little bit of sense. I haven't seen to many pics on this unless it's a full tube chassis. any help I can get would be great.


thanks alot, chuck

[BajaFand]

That can work but when you bend toward the frame you get more surface area for the tube attaching to the frame and much more weld area as well. It is also very difficult to shear the joint, when you build a "subframe" that comes off of the frame at 90 degrees it creates two joints that can possibly shear easier. It is not considered the wrong way to do it, it has held up on many occasions. I prefer to bend in toward the frame and weld the rollcage pillars directly to the frame through a doubler plate.

[Ziggy]

Ok, so I've read my books looked at pics, asked alot of questions, saved my pennies and bought a model 3 bender and practiced with bumpers etc. my question for you guys (and girls) is this. when I come to attaching the cage to the frame, insted of bending the tubing making it slant in toward the frame could I make "nerf bars" under the cab and just go straight down thru the floor and attach at that point? hope that makes a little bit of sense. I haven't seen to many pics on this unless it's a full tube chassis. any help I can get would be great.


thanks alot, chuck

I think I got the right picture

[truck poor]

thanks for the info, that makes sense. so, in a rollover most of the downward force would be transfered to the frame?

[Ziggy]

heres another

[Ziggy]

Her is one towards the back.

[Ziggy]

thanks for the info, that makes sense. so, in a rollover most of the downward force would be transfered to the frame?



Yea.I rolled it hard once(in the lead on ESPN my 2nd CORR race) and it never moved or cracked.Its chromoly

[DesertLab]

I opted to build a subframe for my 7 Open truck. Instead of building the subframe perpendicualar to the frame at 90 deg; I built mine angled up toward the bottom of the cab, achieving the "More Surface Area" mentioned in a previous post. I personally like the subframe method, but everyone has thier own opinion for various reasons.

There's a few pics in Phase 1 & Phase 2.
http://www.desertlab.com/arsenal/

josh@desertlab.com

[partybarge_pilot]

Box them in like this

http://www.race-dezert.com/forum/attachment.php?attachmentid=46602&d=1224175973

Stolen from the H&M Supercrew (http://www.race-dezert.com/forum/showthread.php?t=51052) build.

[truck poor]

Thanks alot to everybody for the input I have some general idea of the safety issues involed with the different methods. thanks again!

[jason@gmachine]

or like this,
There is a 2" by .120 wall tube that lays accross the frame under the floor that hits both B-pillar down tubes. Then boxed in with cold Rolled steel.

http://www.gmachineracing.com/images/GEDC0224.JPG

jason