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how much pressure???

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how much pressure???

Unread postAuthor: AcDc83190 » Mon Jan 23, 2006 2:27 pm

hey im a newbie to spudguns and i recently built a pneaumatic cannon with a 2" chamber,3/4 barrel, and a ball valve. I used ABS for my 2" chamber and i now know that its not pressure rated but what would be a safe PSI to put in it. Any help would be great. thanks
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Unread postAuthor: beebs111 » Mon Jan 23, 2006 3:55 pm

i know its not pressure rated, but did u say you only used abs for the chamber? if so i would not reccomend putting much pressure into it at all because i dont think the joints will hold
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Unread postAuthor: darkpyro » Mon Jan 23, 2006 5:08 pm

hey if you are useing a ball valve then you should be able to unscrew the compression chamber (which is made of abs) and make a new one out of pvc to screw on dont use abs or you will damage yourself. :(
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Unread postAuthor: jrrdw » Mon Jan 23, 2006 5:13 pm

rebuild your gun with the rite stuff, a belly full of plastic shards aint worth the chance 4 real
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Unread postAuthor: darkpyro » Mon Jan 23, 2006 5:16 pm

to right but you only need to rebuild your compression chamber just unscrew the old one and screw the new one straight in. :D
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Unread postAuthor: Atlantis » Mon Jan 23, 2006 7:07 pm

As a warning, PVC nor ABS show up on X-Rays.
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Unread postAuthor: theregoesthewindow » Mon Jan 23, 2006 7:10 pm

in my first potato gun, built with a friend not to long ago, i used ABS. only pressurized it to 30 psi though, still PVC is time tested and much safer to use.
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Unread postAuthor: darkpyro » Mon Jan 23, 2006 9:19 pm

use pvc you idiot havent we made it clear enough !!!!!!!!!!!!!!!!
if you do use abs you can only take it to about 40-50 and even then its not safe and you wont have enough pressure for a good shot dont be stupid rebuild the cannon or someone is going to get hurt :x

srry to be harsh but i dont want you filled with pipe shards
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Unread postAuthor: swim_scrub » Tue Jan 24, 2006 11:56 pm

If you consider analyzing it using plane stress methods it is pretty simple. I would recommend picking up a Mechanics of Materials book and reading the chapter on "pressure vessels."

Im not going to give you an answer because i dont want to be responsible for someone hurting themself with a poorly designed gun. But, this is how you would find the "theoritical" limit of the gun.
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Unread postAuthor: Urban Ninja » Wed Jan 25, 2006 6:07 am

Just replace the chamber, I would rather spending a few dollars on piping rather than it blowing up and having my ribs broken or dying. I built an ABS one years ago (I thought it was pressure rated picked up the wrong one at store, REtaRd) Pressurised it to 40 psi and boooom. The valve blew off like a missile. The whole barrel flew about 40-50 yards, no joke. Dont post Oh ninja ya moron, yeah I know I am but a few years ago I had no idea about spudding.
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Unread postAuthor: r0n » Wed Jan 25, 2006 8:23 am

Im in ontario and i cant seem to find PVC ive looked in home depot and all i have found is the electrical PVC and ABS and PVC drain pipe which has holes in it. Could anyone point me in the right direction to where to find PVC?
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Unread postAuthor: Urban Ninja » Wed Jan 25, 2006 9:02 am

Look in the yelllow pages for hardwre stores and plumbing supply shops. Or go to bunnings if you have one nearby.
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Unread postAuthor: jrrdw » Wed Jan 25, 2006 3:03 pm

pvc + cold temp = disaster it's why it's hard to find in Canada, type plumbing supplies in googlee and you will find a order source
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