Realized after I posted the pictures that the holes and the bolts for the rear tie ins werent drilled yet. The cage is not just welded to the rear bumper/ cross member, the cross member actually comes out with the cage. The cross member bolts to the frame with four bolts on each side. The Frame tie in is directly below the 4x8 1/4 inch plate seen in the picture. The pic was taken just before I got my magnetic drill press in there to drill the holes for the bolts going to the tie in. I figured I would explain that pic before I get flamed for just welding that little bit of plate to the cross member that plate would just bend with any down force to the cage if it were just welded to the bumper / cross member like that.
There are so many good ideas, great how everyone building them has their own individual style.
I'm sure this has been asked already but I was wondering roughly how much linear feet of tube steel does it take to build a 6 point cage? Something that connects to to the floor/frame at the A pillar, keeps the stock B pillar, and then encapsulates the rear family style. Not with a cross member at the dashboard, top of windshield, and then the stock roll bar, and then at the rear, with 2 members running front to rear on top as a halo?
I'm thinking of building or pricing something like that for my CJ7.
I think I've been through this whole thread and I don't remember seeing any discussion on harness mount location. I think properly designed cages and properly mounted go hand in hand. If you have improperly mounted harnesses there's a good start hands you can compress your spine in the event of a roll over.
Proper harnesses mount location.
If you're in control you're not going fast enough - parnelli jones
Wow, long thread. I've been thinking about getting a cage lately. After reading this and a few other threads I'm probably going to go with the AtoZ Fabrications kit that adds onto the factory cage. After reading about the benefits of having diagonals in the main hoop (B-pillar), I want to add something like that while still retaining the ability to use the rear seat. I usually have passengers when during trips.
I stole this picture from an earlier post in this thread, the green is what I plan on adding.
I know that it isn't the best design as far as strength is concerned but it still give room for people to get to the back seat, and has to be stronger than not having anything there. The vertical sections will attach to a piece of C-channel that will be placed over the tunnel just behind the console. Any suggestions or alternative ideas are welcome.
Edit: Not that it helps the cage, but it would make a handy spot to mount some cup holders for the rear passengers too.
Was this or something like it ever done? I really didn't see much input on it. I was planning on this(or something similar) bc I need my back seat since my Jeep is my DD.
[URL="http://www.youtube.com/watch?v=aZ5Oz60S-b0"]My 3 Year old son throwing a tomahawk[/URL]
[URL="http://www.youtube.com/watch?v=Z9udaVbLOHQ"]My 3 year old son shooting a bow[/URL]
[URL="http://www.jeepforum.com/forum/f22/college-w-kids-aka-very-low-budget-tj-build-1231456/"]My Jeep Build Thread[/URL]
[URL="http://www.jeepforum.com/forum/f37/my-first-fab-project-tj-front-bumper-1231585/#post11760786"]My First Fab Project... TJ Front Bumper[/URL]
[URL="http://www.jeepforum.com/forum/f9/my-cold-air-intake-writeup-1306786/#post12754414"]My Cold air intake 'build'[/URL]
Well I started reading the first few pages of this thread yesterday, saving pictures and notes as I go, then low and behold I've decided I need to add a little extra support to my cage while I have it out of the Jeep during some dash rebuilding. I took the time to make some fancy mark-ups of the sport cage I inherited from the PO, which is basically the CJ7 stock roll bar with a front hoop/A pillar and two spreaders on either side. Sadly this Jeep sees mainly street use, with occasional trails rides. No crazy rock crawling up cliffs or high speed mud bogging. As I go through the Jeep, it will see more and more off-road use, but that's a mindset for another thread. I'd like to keep the budget down low, and not add tubing to the point of looking more like a buggy than a classic CJ. I will always run two stock seats (tied to the body with stock risers for now), and will occasionally throw in the back seat so around town cruising. I have been planning on tie-ing the A pillar/front hoop and B pillar/ main hoop to the frame through plates and poly bushings as seen earlier in this thread. My main question, that didn't seem to be addressed in the 52 pages (whew!) of this thread was the order of preference for adding bars, as well as the direction (and function) of spreader bars connecting the middle of the front and main hoops. So starting with the pic below, marked on my cage out of the jeep and sitting on the ground, what is the order of preference for adding bars?
These three different colors represent the tentative plan on additions I would be willing to make at this point, unless you convince me I need more. I am an engineer, so I fully understand the point of triangulations, nodes, etc. I'm just looking for input from fellow Jeepers based on experience. The blue represents two spreader bars opening forward to support the front upper corners. Can I get away with just adding these two and nothing else? The green color would represent a dash bar, as I noticed in the majority of cages posted in the previous threads. I'm assuming this is to provide lateral stiffness in the front two legs going vertically down by the dash, but I do not really want to add the vertical bars running 'through' the windshield by the rear view mirror, so can I get away with not running this dash bar? While the green and blue represent bars I think I could easily add, I've added a third red color showing horizontal bars down by the floor tie-ing the front and main hoop feet/lower sections to each other. Please let me know if I should add one over the other, or if my minimal cage design tat would be acceptable leaves bars out that I'm not showing.
Now onto one more question still left in my mind- what is the best way to arrange vertical spreader bars? I'm assuming the best way seems to be in a V shape opening forward, but I've also seen two other common arrangements marked up below... let me know your throughts.
The top picture is best as it provides the most triangulation where it is needed--the top of the A-pillar seems to take the most abuse.
That's about what I was thinking as I looked to direct forces from those front corners. Assuming I tie A and B pillars to the frame as mentioned, can I get away with only adding those two blue tubes shown in the top, or should I also think about adding the green dash bar or red side spreaders (or any others you can think of)?
Let's talk gussets, let's say someone was adding to the factory cage where would you place gussets? Planning on using the A to Z kit and running taco gussets to add more strength to the cage. Not 100% sure where and how many! Knowing me i would add a 45 on every corner lol Your thoughts experts?