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PCBD punctured controlled burst disk

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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what are those other pics?

Poll ended at Sat Mar 21, 2009 10:15 am

icbm test
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my burst disk cannon shooting a bb?
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Total votes : 1
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PCBD punctured controlled burst disk

Unread postAuthor: covey12 » Wed Mar 18, 2009 10:15 am

hey guys this is my first burst disk, not sure if it will work because i have no pvc glue to put it together, watch the video it explains it, basically you push the barrel down and it punctures the burst disk. :arrow:

and if you guys figure out what those other pics are ill give you 10000000 theoretical dollars, i swear they're real, and right from my back yard

[youtube]http://www.youtube.com/watch?v=Ch3rdOQ92k8[/youtube]
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Attachments
DSC04875.JPG
cannon
DSC04874.JPG
chamber
DSC04872.JPG
barrel after being pulled down to fire
DSC04871.JPG
barrel before being fired
DSC04868.JPG
barrel
DSC04867.JPG
threaded end cap with hole for barrel
DSC04865.JPG
the valve from the ball that i had laying around my house, i dont think it will work very well lol
DSC04854.JPG
figure out what these pictures from my back yard are and ill give you five bucks, i swear there real, and in a couple of days ill say what they are cuz i know what they are
DSC04857.JPG
????????????
DSC04861.JPG
icbm?
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Unread postAuthor: Hubb » Wed Mar 18, 2009 10:19 am

Nice, um, foot....

Seriously, though. This will work. There have been several punctured burst disk designs, although I do not recall seeing one where the barrel does the puncturing. The biggest concern I see is the barrel flying off with the projectile when it is triggered.

As a matter of fact, Gort has put together one of the best punctured burst disks I've ever seen. It's called the Q-something.

Edit: It's called the QCTBDC - link

As far as the bottom pics, it looks like orange lights and streaks in the night sky. So, when can I expect my money?
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Last edited by Hubb on Wed Mar 18, 2009 10:22 am, edited 1 time in total.
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Unread postAuthor: D_Hall » Wed Mar 18, 2009 10:20 am

Lower pics look like a launch of some sort. Given that the Shuttle went up a few days ago and the land in the bottom pic looks very flat, I'll guess that you live in Florida and the pics are only a couple days old.

edit: Seeing that you've labeled them as IBCM?? I now gather that YOU don't know what they are, that you weren't quizzing us. If so, it should be pretty easy... When were the pics taken? There are, after all, web pages that list every major launch in the world. Cross reference your location and the date and you should have your answer.
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Unread postAuthor: covey12 » Wed Mar 18, 2009 10:23 am

D_Hall wrote:Lower pics look like a launch of some sort. Given that the Shuttle went up a few days ago and the land in the bottom pic looks very flat, I'll guess that you live in Florida and the pics are only a couple days old.

edit: Seeing that you've labeled them as IBCM?? I now gather that YOU don't know what they are, that you weren't quizzing us. If so, it should be pretty easy... When were the pics taken? There are, after all, web pages that list every major launch in the world. Cross reference your location and the date and you should have your answer.


lol he got it it was the shuttle, it was really cool down here and it did look like a missile going up and i meant icbm lol, but yeat you got it
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Unread postAuthor: jmeyer1022 » Wed Mar 18, 2009 10:30 am

The pics are from the shuttle launch.
http://www.sharenator.org/Space_Shuttle ... ter_users/

Also that should work fine at lower psi. Once you take it higher you risk your hand going with the barrel. What I would do is add two compression springs. A simple diagram but when you have the springs bolted in place all you'll do is pull the barrel forward a bit and then let go and it'll move back and pop the burst disk and the barrel won't fly out of place because it will be bolted down by the tension springs. 2 for 1 deal.
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Unread postAuthor: covey12 » Wed Mar 18, 2009 10:48 am

jmeyer1022 wrote:The pics are from the shuttle launch.
http://www.sharenator.org/Space_Shuttle ... ter_users/

Also that should work fine at lower psi. Once you take it higher you risk your hand going with the barrel. What I would do is add two compression springs. A simple diagram but when you have the springs bolted in place all you'll do is pull the barrel forward a bit and then let go and it'll move back and pop the burst disk and the barrel won't fly out of place because it will be bolted down by the tension springs. 2 for 1 deal.
Image


thats smart i have some springs lying around too, thanks
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Unread postAuthor: Stephen Holliday » Wed Mar 18, 2009 11:58 am

Flare the end of the barrel so that it is bigger then the hole the barrel slides in. Put an o-ring between the flared barrel and the screw on cap hole. That will keep the barrel from sliding out and should puncture the disk.
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Unread postAuthor: covey12 » Wed Mar 18, 2009 12:40 pm

k thanks for that,

what is the best thing for a burst disk this size because, the tenfoil keeps tearing little holes in it while the cap is getting screwed on.
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Unread postAuthor: jmeyer1022 » Wed Mar 18, 2009 12:42 pm

Painters tape, then use a knife to cut the excess around it.
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Unread postAuthor: iemand » Wed Mar 18, 2009 4:34 pm

I'm working onto something similair, except my design will hold the barrel by itself, which reduces the risk of barrel-being-the-ammo :roll:

You could try to put some duct tape on the inside piece of the barrel (the chamber side), so that the barrel will be hold in there by itself(ofcourse this isn't really safe, and only a temporarily solution, but you get the idea)
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