Tubing, for those in the know

[Cajun]

Would 2" .100" wall DOM be a viable material for cage building? Everyone recommeds .120" wall, but does that .02" really make that big of a difference? I'll try and dig up some strength figures if I have time today.

The reason I'm asking is that I'm hearing rumblings of a smoking deal on the aforementioned DOM. The catch is we'll have to buy in bulk, and by bulk I mean in bundles of 1000'. Don't run away just yet, the prices I've heard will make it not only affordable, but well worth any trouble that this may cause.

I need hard facts. I'm not interested in the blah blah bullsh*t info that clogged our last debate.

[Chadnutz]

Right off the bat you can tell that .12" wall is 20% thicker than .1" wall. I'm asking my bro (MENG grad) if he learned anything about this in materials class.

[redcagepatrol]

my cage is done.
that's alot of tubing... are the enough people to go in on it? must be a good deal. Does anyone have a 2" die? I thought 1.75" tubing was big, but 2" sounds real big to do the whole cage in.

It all comes down to the numbers on how much it cost. You can build a safe cage using that, but is it worth it?

[Cajun]

Originally posted by redcagepatrol
Does anyone have a 2" die?

Yes, I have a 2" die.

Originally posted by redcagepatrol
It all comes down to the numbers on how much it cost. You can build a safe cage using that, but is it worth it?

That's precisely what I'm trying to determine. If the factor was cost alone, then I'd be busy buying tubing right now.

[froader03]

all I know is I might be interested if this pans out. keep us posted.

[Cajun]

Anyone have a phone # for Triple S Steel in H-town? I'd like to check out their surplus stock/prices.

[robertf03]

i had a chart with different weights of materials, but can't find it.

how much more does the 2" .100 weigh compared to 1.75" .120?

if it ends up weighing more, I'd say avoid it. more sprung weight and a thinner wall doesnt sound like a good overall design to me.

[Cajun]

Agreed on the weight issue. I haven't been able to find a listing for .100" wall DOM at all. I see .109" wall and .120" wall. I got the .100" number over the phone from a 3rd party. I haven't been able to talk to the source yet.

Flem, find that damn spec sheet!

[robertf03]

only specs I can find online are http://www.davesport.com/specs.htm , but I was able to find out the weights

2.029 lb/ft for 2"x.10
2.089 lb/ft for 1.75"x.120

heres my work if ya want to check it


pie (1/2 OD)^2 - pie (1/2 ID)^2 x 12 = "^3

3.1415 (1/2 1.75)^2 - 3.1415 (1/2 1.51)^2

.0875 (0.765625) .755 (.570025)

2.4052109375 - 1.7907335375 = 7.3737288

0.28330306913376038456960879819719 lb/ft



3.1415 (1/2 2.00)^2 - 3.1415 (1/2 1.8)^2 = 0.596885 x 12" = 7.16262 * 0.283303
1 .9

[froader03]

this is for 1" of length, so you can figure from there with the weights rob found.

AREA (in cubic inches):
for 2" with .10" thickness = 0.19*Pi
for 1.75" w/ 0.12 thickness = 0.1956*Pi

rob did it right. careful not to round before you get to the end (or just use lots of decimal places like he did). if you do you're gonna get an answer that's farther off the actual than the final difference between the two. but this does go to show the negligable difference. I still wanna hear what kinda deal andy found if he gets 1000' of this stuff.

[robertf03]

i skipped that part of chem 107 about significant figures

[Jackasic]

maybe this page will help you determine the strenght.

Rob, you want to do the math?

click here

[Jackasic]

you may also want to check the SCCA web site and see what you can find there. They general have it lined out what sizes are acceptable.