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Old 03-11-2010, 03:54 PM #1
xgstnightmare
 
 
Join Date: Mar 2010
Metal air chamber

Hello all,

I was wondering if anyone had some suggestion on what to use, for a metal air chamber, such as what type of metal tubing. I'm currently developing a few cannons and would love some input. Although the cannons will be vehicle mounted, id like them to be as light as possible.

thanks
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Old 03-11-2010, 04:11 PM #2
DasWolfenstein
 
 
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Location: Texas
Use aluminum for some parts like the barrel.
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Old 03-11-2010, 04:17 PM #3
xgstnightmare
 
 
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aluminum is a good suggestion, only issue is i do not have the equipment to weld aluminum, i only has a small gasless welder
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Old 03-11-2010, 04:33 PM #4
DasWolfenstein
 
 
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Quote:
Originally Posted by xgstnightmare View Post
aluminum is a good suggestion, only issue is i do not have the equipment to weld aluminum, i only has a small gasless welder
What kind of welder do you have? Mig, arc (stick wielding), or tig?

http://www.lincolnelectric.com/knowl...compactmig.asp

^^^ Just in case you have a mig/tig.
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Old 03-11-2010, 04:34 PM #5
xgstnightmare
 
 
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its a small wire feed mig welder, craftsman brand
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Old 03-11-2010, 04:34 PM #6
DasWolfenstein
 
 
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Okay well check out that link I posted should help with the welding.
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Old 03-11-2010, 04:41 PM #7
xgstnightmare
 
 
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thanks i wonder if brazing rods could be used in a pressure application, does anyone have any input there?
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Old 03-11-2010, 05:04 PM #8
DasWolfenstein
 
 
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Quote:
Originally Posted by xgstnightmare View Post
thanks i wonder if brazing rods could be used in a pressure application, does anyone have any input there?
Yea I wouldn't do that. If you can use a cheap arc welder use it and keep the amp around 55 for aluminum.
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Old 03-11-2010, 09:22 PM #9
jvtech
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Use a Fire Extinguisher. It's very light and easy to get. It has enough volume to launch a nerf 120+ yards. BoomMaster has some detail photo on how to tap it.
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Last edited by jvtech : 03-11-2010 at 09:25 PM.
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Old 03-12-2010, 07:17 AM #10
labmaster
 
 
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labmaster supports our troops
Yeh, what he said.
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Old 03-12-2010, 08:05 AM #11
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Quote:
Originally Posted by jvtech View Post
Use a Fire Extinguisher. It's very light and easy to get. It has enough volume to launch a nerf 120+ yards. BoomMaster has some detail photo on how to tap it.
BoomMaster is like a ****ing genius when it comes to building anything.
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Old 03-12-2010, 01:06 PM #12
xgstnightmare
 
 
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he really is, i ahve been speaking with him for a few weeks now about other launcher related things, very informative and an all around nice guy
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Old 03-12-2010, 01:21 PM #13
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Originally Posted by xgstnightmare View Post
he really is, i ahve been speaking with him for a few weeks now about other launcher related things, very informative and an all around nice guy
I enjoy talking with him about anything in general he is nice, polite, has good grammar, smart, and just all around awesome.
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Old 03-14-2010, 06:45 PM #14
Boom Master
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Sorry I missed your post. I use the disposible, non-rechargable fire extinguisher bodies. Rated for compressed air at 300 psi and charged to 200 psi as a fire extinguisher. Battle tested. Lighter than PVC and a whole lot safer.



Disassemble the nozzle and cut it off. Drill and Tap 1/2" NPT pipe thread and insert a 1/2" pipe nipple. Use it in my RPG hand held and autoloading cannon. About 100 ci volume.


Pic of my 20" long RPG 'side arm' using the fire extinguisher body.



A close up of the plumbing. Note the all metal valve rated 200 psi.




I have a whole series of pictures and instructions. Anybody can e mail me for them. ddupont@charter.net
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