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Burst disk Inline

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Burst disk Inline

Unread postAuthor: frankrede » Mon Sep 17, 2007 10:13 pm

This is my throw together gun.
It has a .40 blowgun barrel and a 3/8" union+co2 tank for a chamber.
I use aluminum foil as burst disks.

I shot a penny also.
I clipped it with a tiny nail., essentially it tore the penny in half.
Sorry no pics but the carnage is scary.
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Unread postAuthor: meatballs » Mon Sep 17, 2007 10:55 pm

thats awesome. i love seeing coins punctured like that, thats some serious power. how much pressure do you go to when shooting? nice gun
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Unread postAuthor: frankrede » Mon Sep 17, 2007 11:18 pm

I use around 100 psi, or until the foil bursts/
I have done one shot at even higher pressures using water inside the chamber and heating it with a blowtorch
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Unread postAuthor: Pilgrimman » Mon Sep 17, 2007 11:33 pm

Wow. It looks so... thrown together! :D Pretty nice, however, since it penetrates coins, and whatnot! That water heating chamber thing... that's what the Mythbusters did once! :lol:
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Unread postAuthor: darkmilk » Mon Sep 17, 2007 11:35 pm

how did u get the fitting off the co2 tank i was gonna do somthin likd that but i couldnt get the original fitting off the co2
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Unread postAuthor: noname » Mon Sep 17, 2007 11:39 pm

I just love burst disc guns! The simplicity and power is amazing!
Darkmilk, get a pipe wrench and a vice. Then figure out how to use them.
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Unread postAuthor: mike1010 » Mon Sep 17, 2007 11:49 pm

noname wrote:I just love burst disc guns! The simplicity and power is amazing!
Darkmilk, get a pipe wrench and a vice. Then figure out how to use them.

lol, i love the simple looks but id use a higher pressure setup if i had that strong of a setup you could run at least 200 psi if you wanted
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Unread postAuthor: Killjoy » Mon Sep 17, 2007 11:53 pm

lol, i love the simple looks but id use a higher pressure setup if i had that strong of a setup you could run at least 200 psi if you wanted

He could take it higher then that.
Nice job frank, all these tests with darts and coins are begining to make me nervous though haha.
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Unread postAuthor: darkmilk » Tue Sep 18, 2007 12:43 am

i did but my tank keeps slipping in the vice. im not an idiot so dont treat me like one.
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 18, 2007 2:25 am

Killjoy wrote:all these tests with darts and coins are begining to make me nervous though haha.


We might be overdoing it somewhat hehe
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Unread postAuthor: Novacastrian » Tue Sep 18, 2007 3:11 am

I think we should see "how many" coins we can get through :twisted:
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Unread postAuthor: f.c » Tue Sep 18, 2007 3:12 am

today i actually succeeded on making a triggered burst disk basically just a ball valve behind the burst disk. release a bit over 100 psi blows a hole through 5 layers of aluminum foil.
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Unread postAuthor: frankrede » Tue Sep 18, 2007 5:48 pm

darkmilk wrote:how did u get the fitting off the co2 tank i was gonna do somthin likd that but i couldnt get the original fitting off the co2
I put the valve part in the vice and took a rubber strap wrench to turn the cylinder until it gave.
keep in mind it may damage a strap wrench if overused.
another way I do it is by putting it in a pipe vice and using a wrench to turn the valve head.
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Unread postAuthor: frankrede » Wed Sep 19, 2007 9:08 pm

A quick question, will aluminum fail if heated with a propane torch with a few hundred psi in it?
I don't like the idea of boiling water and metal being embedded into my body
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Unread postAuthor: jackssmirkingrevenge » Wed Sep 19, 2007 10:24 pm

frankrede wrote:A quick question, will aluminum fail if heated with a propane torch with a few hundred psi in it? I don't like the idea of boiling water and metal being embedded into my body


When was the last time someone died of hot water shrapnel :?: hehe

Why not just see how pressure it takes to burst one layer of foil then stack them up to the approximate pressure you want to achieve?
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