what do you think...

[vetteboy]

Is that 120 wall 2X2,Thicker box tube has more rounded off corners...
Did you weld it with stick?

No, regular MIG. I gotta go and lay another pass on the brace yet, but I didn't have my welding jacket at the time and I got sick of catching myself on fire.

Yeah it's 1/8" wall tube - I'm guessing you're asking because you don't think it's thick anough? I'd agree if it were just a single piece sticking out of the frame rail reinforcement, but in this case where it's welded on both ends (and the 2x5 above it is welded all the way down the old door sills) I think it'll be ok.

 

[ashmanjeepxj]

No, regular MIG. I gotta go and lay another pass on the brace yet, but I didn't have my welding jacket at the time and I got sick of catching myself on fire.

Yeah it's 1/8" wall tube - I'm guessing you're asking because you don't think it's thick anough? I'd agree if it were just a single piece sticking out of the frame rail reinforcement, but in this case where it's welded on both ends (and the 2x5 above it is welded all the way down the old door sills) I think it'll be ok.

120 is fine for cage work but it the low point and could easily be dented once dented 120 wall is not very stong... I have abit of 120wall dentage..

 

[vetteboy]

120 is fine for cage work but it the low point and could easily be dented once dented 120 wall is not very stong... I have abit of 120wall dentage..

The 'boatsides' that are going over it are 1/8" also...and will be attached by at least 3 fasteners into each brace (5 total on each side). For what that's worth.

 

[ashmanjeepxj]

The 'boatsides' that are going over it are 1/8" also...and will be attached by at least 3 fasteners into each brace (5 total on each side). For what that's worth.

yea that should help alot with dent resistance.

I wish I boat sided mine when I started, now its too much work to swap, After my cage is too dented Ill boat side mine on the next rebuild. and use DOM not HREW to help prevent denting.

 

[vetteboy]

yea that should help alot with dent resistance.

I wish I boat sided mine when I started, now its too much work to swap, After my cage is too dented Ill boat side mine on the next rebuild. and use DOM not HREW to help prevent denting.

Yeah, cage is all DOM. I still have a lot more sheet metal than you do though, so if the cage gets dented, it's most likely because the roof got dented first.

Still gotta figure out how to do the C-pillar tie-in though so the rear tires don't rub on the bracing.

 

[RuffedUpXJ]

autoCad is so far behind is drawing these days, look into ProE you can change on the fly so you just rough sketch and then change it. And the X thru the bB-pillar could be the difference between you walking away from a roll and havving to be removed after the roll.

 

[vetteboy]

ProE is what I always used for 3D stuff. However being able to model is also nice.

Simulating a flop onto the driver's side roof/rain gutter edge.

The stress results show that the primary cage members doing all the work are the diagonals in the B-pillar, followed closely by shear force at all floor attachments. With those removed:

notice that hardly any parts of the cage are doing anything. Nearly all the stress is directed right at the connections to the floor, and the stress value is nearly twice that of the previous design. By adding the triangular bracing at the b-pillar you're greatly increasing the strength available and also the efficiency of the cage at resisting impacts.

 

[rehab]

wow thanks for all the info guys!

 

[rocklandxjer]

ive never even heard of ProE. looks pretty nice, i like the stress analysis.

i love inventor though, have you done any work with it. its a pretty powerful program, and i think there is a stress analysis system worked into it, not sure though, ill have to fool around with it on monday.

 

[Captain Ron]

Unless you have an advanced degree is structures, along with 25 or more years provable in aerospace shell design, AND 15 years provable of parametric programming....

Keep your immature ProE speculation to your self.

What rot. GIGO...

--ron

 

[Captain Ron]

To all the folks out there that have access to ProE, SolidWorks, CATIA, stupid "Inventor", and sucks for you, SolidDesigner or whatever...

Just because you can enter a few dialog boxes in any given program does not make you any kind of informed person.

Nor, does it make you an engineer.

I eat you dumb asses for lunch 5 days a week on a professional basis, delivered by *professional* folks with a hell of a lot more experience in the commercial and aerospace industries than most of you will have in the next 20 years.

So if you are some 20 something college dropout with a copy of the latest, greatest, *software of the month*, via an "educational" copy, please, take it to Pirate, cause it ain't advanced tech to me just because you can post it. If you cannot do a simple 2D with dims, sticks to MS Paint. I, for one will get a lot more value out of it.

Thanks.

--ron

 

[rocklandxjer]

Hey sorry if i offended you by speaking about inventor.. i was just saying that its a decent program.
Also i dont claim to be an engineer, im only 17. I got a scholarship to RPI in troy and im going there for aero and propulsion systems engineering. I honestly would never make a claim that i am an engineer because i have taken a couple college senior and junior level classes at various schools and i can say that most of it was right over my head at this point.

i never claimed to be a master at anything, i just said that ive never heard of ProE, didnt even know what it was.

sorry if i offended you in any way by speaking of autocad and inventor...

 

[xuv-this]

hey ron, why don't you stop bashing and contribute some of your knowledge to the subject at hand?

 

[Ghost]

hey ron, why don't you stop bashing and contribute some of your knowledge to the subject at hand?

Sounds like a good sugestion to me!

 

[xuv-this]

hey rehab, i had the same problem with my cage/rear seat. the problem with the b hoop crossbracing is that either the front or rear passengers will have hardly any legroom. i like your idea of reversing the rear kicker, but it will interfere with the rear seatback.
here's mine:

the front pass can still recline their seat, and 2 6" people can sit pretty comfortably in the back. but 3 adults in the back is not gonna be feasable with kickers. if you have to fit three in the back, i would forget the kickers and tube gusset the hell out of it.

 

[partsbill]

Pardon me for injecting a probable, somewhat stupid question in the middle of all the interesting design. Once all is said and done, the welds are finished and the seatbelts arein, how much protection are we looking at here? A slow rollover protect on a rocky trail ride, a high speed rollover off of a sand dune, or a crash on the highway? The body panels are going to be trashed , but the occupants are safe. Just wondered what the outcome protection was planned?

 

[jjvande]

To all the folks out there that have access to ProE, SolidWorks, CATIA, stupid "Inventor", and sucks for you, SolidDesigner or whatever...

Just because you can enter a few dialog boxes in any given program does not make you any kind of informed person.

Nor, does it make you an engineer.

I eat you dumb asses for lunch 5 days a week on a professional basis, delivered by *professional* folks with a hell of a lot more experience in the commercial and aerospace industries than most of you will have in the next 20 years.

So if you are some 20 something college dropout with a copy of the latest, greatest, *software of the month*, via an "educational" copy, please, take it to Pirate, cause it ain't advanced tech to me just because you can post it. If you cannot do a simple 2D with dims, sticks to MS Paint. I, for one will get a lot more value out of it.

Thanks.

--ron

sounds like someone's got sand in their you know what...


2D... i find that most "older" engineers like to stick to the 2D stuff while most younger ones get stepped on when starting with 3D... it all goes back to the slide rule and the old drafting style of design done on pen and paper from what i can tell.

you're correct that from a quantitative sense quick and dirty calcs like were posted don’t mean much. But, you can gain some insight on a design very fast with a simple 3D sketch and a run through ANSYS or similar.

no need to bash...

and this is coming from a young engineer, so what do i know

 

[rehab]

first off, yes im a sophomore studying civil and stuctural engineering. i have had some basic CAD classes but im not up to the major sturctural annaylis and statics, so i figured to convey my point more clearly i would scetch it since not everyone can read a 3d drawing with ease.

basically im looking for a design that will protect the passengers and ME in the event of a roll down a hill. im not expecting some major rocky cliff or a giant dune, just off camber floops. but it never hurts to engineer it in a way to maximize protection.

xuv-this:

do you have any more pics of that, its a very interesting design

oh yeah and ron, i appreciate your information, and its not everyone elses fault that your a freaking genious that has been engineering shit for 100 years. so please, if you have nothing useful to add, kindly stop with your rampage.

 

[xuv-this]

the cage is a modified essent. offrd. jeepspeed edition, tied into the chassis at 8 points. i can get more pics this weekend if you like.

sorry for the huge pics, but here's why you want triangles in that cage, tied into the chassis:

just keep in mind, that if you flop it and the cage gives in a little with the body, you might have to cut/untweak the cage to untweak the body. just more emphasis on triangular rienforcement.

 

[Ghost]

just keep in mind, that if you flop it and the cage gives in a little with the body, you might have to cut/untweak the cage to untweak the body. just more emphasis on triangular rienforcement.

XJ's are disposable. I'm on my second one now. About to build this one with a cage.