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Old September 29th, 2006, 04:55 PM   #1
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Default Exo Tube Size

Wondering what the best DOM Tube size is for an Exo on my XJ. I am going to go the first of the week and price it all out, design it, and hopefully the build will start the middle of Oct. What do you guys think is the best?
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Old September 29th, 2006, 05:18 PM   #2
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most of the ones I have seen have bee 1.500 for smaller vehicles 1.625 for mid size and 1.750 for full size all .120 wall
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Old September 29th, 2006, 05:22 PM   #3
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most of the ones I have seen have bee 1.500 for smaller vehicles 1.625 for mid size and 1.750 for full size all .120 wall
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Old September 29th, 2006, 07:14 PM   #4
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Many exos are also built from 1-1/4" sch 40 pipe, which is 1.66" with a 0.140 wall.
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Old September 29th, 2006, 10:39 PM   #5
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Many exos are also built from 1-1/4" sch 40 pipe, which is 1.66" with a 0.140 wall.

damn strong stuff and way cheaper than dom tubing.^^^^ use what he said.
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Old September 30th, 2006, 09:50 AM   #6
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i'd do 1.75" .120 wall hrew
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Old September 30th, 2006, 10:49 AM   #7
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depends alot on your application and how it will get used. these guys are all right on in what they're saying - heres a few other things to consider.

on the average cage ill use a minimum of two kinds of tubing and at least 3 or 4 sizes for the following reasons. in general members have a variety of loads placed on them and there all a little different depending where they are in the structure. a good example is an interior member, (meaning interior to the volume of the cage, not nessicerily in the vehical) that is in tension with occasional compression would only need to be 1/2 the size and strength of the exterior bars. ive used as little as 1" od .060 mild hrew in those locations without failure. BUT, you have to use it in the right spot. on the other hand, DOM, for its cost, has superior impact resistence so its a natural for sliders and lower members where gravity and your rigs weight is headed most of the time.
my point is that 060 1" inch hrew is a fraction of the cost of 2" 120 DOM or even the dreaded high carbon stuff. so in tuning your design even a little, you end up with a weight and cash-outa-yer-pocket effecientcy by putting the beef only where you need it.
theres alot more to talk about but thats the basic idea - good luck, and post'em as you go
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Old September 30th, 2006, 11:00 AM   #8
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Quote:
Originally Posted by VonDirt
depends alot on your application and how it will get used. these guys are all right on in what they're saying - heres a few other things to consider.

on the average cage ill use a minimum of two kinds of tubing and at least 3 or 4 sizes for the following reasons. in general members have a variety of loads placed on them and there all a little different depending where they are in the structure. a good example is an interior member, (meaning interior to the volume of the cage, not nessicerily in the vehical) that is in tension with occasional compression would only need to be 1/2 the size and strength of the exterior bars. ive used as little as 1" od .060 mild hrew in those locations without failure. BUT, you have to use it in the right spot. on the other hand, DOM, for its cost, has superior impact resistence so its a natural for sliders and lower members where gravity and your rigs weight is headed most of the time.
my point is that 060 1" inch hrew is a fraction of the cost of 2" 120 DOM or even the dreaded high carbon stuff. so in tuning your design even a little, you end up with a weight and cash-outa-yer-pocket effecientcy by putting the beef only where you need it.
theres alot more to talk about but thats the basic idea - good luck, and post'em as you go

My head hurts after reading that.
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Old September 30th, 2006, 12:32 PM   #9
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Yeah, but the main point of an exo cage is to bash along obstacles without damaging the body. I can say with the way my truck is back-halved, it is very nice to know I can rub on rocks or trees and cause no damage.

I don't see the bending moment of 1", especially 0.060" wall (even in chrome-moly DOM) taking the punishment. Plus, the thin wall will be succeptable to denting.

And, of course, 1" tube for an exo would be asthetically disgusting.

The 1.5 - 1.75" size is generally the nicest looking from that standpoint.

What you make it out of is up to you, and depends on what your local steel yard carries.

I buy from Pontiac Steel, a 21' stick of 1-1/4" sch 40 A500b is about $35, when I bought last. Often, the HREW (hot rolled electrically welded) tubing you buy is also the same A500b grade, so don't be afraid of the word 'pipe' (read my 'poop pipe' thread for more info in this forum).

For reference, your weights would be:

1.5" x 0.120 wall = 1.77 lbs / ft
1-1/4" sch 40 (1.66 x 0.140wall) = 2.27 lbs / ft
1.75" x 0.120" wall = 2.09 lbs / ft


BTW, what type of bender/dies do you have? That kinda makes the design..
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Old September 30th, 2006, 01:24 PM   #10
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yes HREW and schedule 40 are made from the same 1010 material.

1020 Dom has a lot higher carbon content so it doesn't dent as easily as the above mentioned. And the 1026 is a tad stronger yet.

If it were mine I would do 1020 for the rock rails and fender guards. for when slammed into rocks it won't dent as easy.
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Old September 30th, 2006, 06:49 PM   #11
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[QUOTE]I don't see the bending moment of 1", especially 0.060" wall (even in chrome-moly DOM) taking the punishment. Plus, the thin wall will be succeptable to denting.

And, of course, 1" tube for an exo would be asthetically disgusting.[/
QUOTE]



uh, yea. but that isnt what i said.

i was reffering to material application and only trying to make the point that you dont have to use one kind of tubing for the whole cage. you can usually save some money by tuning the structure thats all.

maybe my statement was miss leading from the stand point that alot exos just tie to the uni body and have zero interior members.

[QUOTE]a good example is an interior member, (meaning interior to the volume of the cage, not necessarily in the vehical) that is in tension with occasional compression would only need to be 1/2 the size and strength of the exterior bars. ive used as little as 1" od .060 mild hrew in those locations without failure. BUT, you have to use it in the right spot.[/QUOTE]

slight side track here but - ive seen more then one where the bars just fold and push in the body panels, so using heavy exterior material is a must but with no interior members it will only be effective to a point, granted its the big crunch stuff im talking about not the regular use stuff.
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Old September 30th, 2006, 08:09 PM   #12
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Quote:
Originally Posted by KILLER"B&quot View Post
yes HREW and schedule 40 are made from the same 1010 material.
Not necessarily. There are many types of Sch 40, just like there are many types of hot rolled and cold rolled. I know I have 1018 HREW square and rectangle in the garage.

Thats nothing but carbon content. I was referring to the ASTM material spec, in the case of the tube I use, its ASTM A500, grade B. Grade C is stronger, but not not common, and doesn't bend well. A500 B and C are considered structural tubing. A53b is also decent for structures, but butt welded Sch40 for home depot would be crap.
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