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Lukes Uber ghetto burst disk

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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Lukes Uber ghetto burst disk

Unread postAuthor: lukemc » Wed May 16, 2007 7:10 pm

well i had this idea for a threaded shrader when i found a fitting that fit nicely on a copper shrader stem. it was to big to solder so just put some JB weld on and let it dry. i needed to know if it would work without my parents driving me to lowes. So i came up with this beautiful burst disk to test my shrader. if you notice about everything is crooked and replaceable if needed.


schrader
Image

aluminum foil disk
Image

the whole setup
Image


the performance of burst disks amazed me i shot a loose fitting bolt 50 yards at 30 psi. i tried pressureizing it and droping a nail down hoping to pop it but all that happened was tsssssssssssss and no pop. if you have and disk suggestions please post
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Unread postAuthor: Mr.Russ » Wed May 16, 2007 7:48 pm

put another layer of foil in, take it up to 60 psi
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Unread postAuthor: lukemc » Wed May 16, 2007 8:10 pm

accualy i just did that. i wasnt sure the pressure rating of the bottle so i put the hose thought a hole in my garage door (for my kitty to get in) and pumped it up. it started leaking at about 40psi around the schrader. im not woried because 1/8" plastic bottle is much different than 1/2" double layered pvc. but sure enought about 60pis i got a pop
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Unread postAuthor: sandman » Wed May 16, 2007 8:24 pm

ive taken bottles over 90 psi, you should be ok going higher
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Unread postAuthor: ShowNoMercy » Wed May 16, 2007 8:27 pm

Whats the point of this setup?
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Unread postAuthor: pyromaniac » Wed May 16, 2007 8:28 pm

Mini burst disks rock! I made one awhile ago I was impressed by the performance. also i like the idea for a screw on schrader.
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Unread postAuthor: sandman » Wed May 16, 2007 8:34 pm

ShowNoMercy wrote:Whats the point of this setup?


ghettoness, i like it cause it reminds me of the bottle rockets i made last year
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Unread postAuthor: bboymatty » Wed May 16, 2007 9:01 pm

do you think you could use a burst disk setup to make a mortar?
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Unread postAuthor: spudthug » Wed May 16, 2007 9:09 pm

ummm duh..@bboymatty

i have one and no name has one
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Unread postAuthor: noname » Wed May 16, 2007 10:05 pm

<a href="http://www.spudfiles.com/forums/burst-disc-mortar-t7500.html"> Apparently you missed this one.</a>
Try chip bag burst discs. With a 1" union they burst at exactly 100 psi, yours is a bit smaller so they'll probably hold about 120. Just sheild yourself with some plywood and keep pumping. To see how much pressure my burst disc gun could hold, I layered 5 chip bags, put the gun in a trash can, put another trash can over the other one, and then the whole setup in a really big trash can, with the pump's hose sticking out so I could still pump. It held 180 psi and I didn't take it higher.
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Unread postAuthor: lukemc » Thu May 17, 2007 9:28 am

i drop sharp stuff down there but i cant get it to pop spudthug
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