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Aluminum pengun

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Aluminum pengun

Unread postAuthor: elitesniper » Sat Jun 14, 2008 11:17 am

Hey guys I haven't posted much recently, because I was mostly lurking around, also I am developing a new cannon heal jr and a pen gun similar to jsr and rcman. I just wanted to ask you guys if an aluminum barrel from a bb airsoft gun could hold much pressure, im going to use marine epoxy bushing and everything will be epoxied in, the id is 6mm, do you think this could hold pressures of 500psi+?
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Re: Aluminum pengun

Unread postAuthor: jackssmirkingrevenge » Sat Jun 14, 2008 11:25 am

elitesniper wrote:do you think this could hold pressures of 500psi+?


Very easily :)
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Unread postAuthor: elitesniper » Sat Jun 14, 2008 12:26 pm

thanks for the feedback , whats your guess on the burst pressure of the pipe? im kinda new on the high pressure stuff :roll:
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Unread postAuthor: SpudFarm » Sat Jun 14, 2008 12:35 pm

around 10000psi.

think of the difference between sch 80 pvc and your pipe.
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Unread postAuthor: Sticky_Tape » Sat Jun 14, 2008 1:30 pm

helluva lot less surface area on the inside means high burst pressure think of the burstdisk jsr used in his 6mm burst disk gun it was 1 layer of scotch tape I belive and in the end he still needed to make it burst by lossening the union. Btw you B*S*A*D I was gonna make one with aluminum jk but seriously I was.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: DYI » Sat Jun 14, 2008 8:14 pm

thanks for the feedback , whats your guess on the burst pressure of the pipe? im kinda new on the high pressure stuff


The following estimate assumes static pressure, a 1.7mm wall thickness (what I guessed from the picture), and a 40KSI tensile strength alloy:
Roughly 22,000psi.
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Unread postAuthor: SpudFarm » Sat Jun 14, 2008 8:16 pm

cylindical pressure vessels with small diameter will only suprise you in their burst pressure
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Unread postAuthor: VH_man » Sat Jun 14, 2008 8:17 pm

wow that looks nice......... im exited for the final product.

and yes, if that doesnt hold even 3000 PSI im afraid cause my paintball gun has a poly hose under 3000 PSI........
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Unread postAuthor: jackssmirkingrevenge » Sun Jun 15, 2008 1:19 am

spudfarm wrote:cylindical pressure vessels with small diameter will only suprise you in their burst pressure


Indeed, I get to play with these sort of toys at work, sometimes flimsy plastic microbore tubing is used and it's hardly believe it can take at least 5,000 psi without failure.
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Unread postAuthor: Sticky_Tape » Sun Jun 15, 2008 10:54 am

DYI wrote:
thanks for the feedback , whats your guess on the burst pressure of the pipe? im kinda new on the high pressure stuff


The following estimate assumes static pressure, a 1.7mm wall thickness (what I guessed from the picture), and a 40KSI tensile strength alloy:
Roughly 22,000psi.

This is not a fact but I measured my airsoft tubing and I am pretty sure all airsoft aluminum barrels have a wal thickness of 1mm not 1.7. Eh elite sniper?
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: elitesniper » Sun Jun 15, 2008 11:56 am

Well im not actually sure but i think dyi is right, but im not sure, as i don't have a set of calipers. I measured against a 6mm bb cut in half:D, pretty crude haha.
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Unread postAuthor: Sticky_Tape » Sun Jun 15, 2008 12:00 pm

You don't need calipers just a ruler with metric. well anyway my airsoft barrel has a 1mm wall thickness.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: elitesniper » Sun Jun 15, 2008 12:03 pm

O well nonetheless if it was 1mm it would still hold over 500psi easily eh?
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Unread postAuthor: Sticky_Tape » Sun Jun 15, 2008 12:06 pm

Damn strait it would. Where do you live?
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: sandman » Sun Jun 15, 2008 12:10 pm

my bet would be yes, and am i the only one that reads "aluminum penguin" every time i see this thread?
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