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THE STING! triggered burst disc cannon.

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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THE STING! triggered burst disc cannon.

Unread postAuthor: thespeedycicada » Sun Jan 06, 2008 7:56 pm

This is my triggered burst disc cannon it is using 1.5 in pvc for the main tank and 3/4 in for the barrel.The thing is awwwwwsomme a large improvement over my sprinkler valve gun (it had the same tank and a longer barrel) and its loud! and thats good.Whats some good ammo for 3/4 in sch40 pvc? so i can get some good damage tommorow :)
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Attachments
P1010188.JPG
in all its glory.
P1010188.JPG (26.98 KiB) Viewed 813 times
P1010189.JPG
the valve assembly.
P1010189.JPG (26.02 KiB) Viewed 813 times
P1010190.JPG
the paintjob!
P1010190.JPG (28.25 KiB) Viewed 813 times
P1010191.JPG
used burst disc's.
P1010191.JPG (27.23 KiB) Viewed 813 times
P1010192.JPG
If its good enough for the bird...
P1010192.JPG (28.67 KiB) Viewed 813 times
current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: hi » Sun Jan 06, 2008 7:58 pm

how is it a "triggered" bust disk? do you just open the valve?

nice. you did a fair job with the paint. i suggest a barrel support.
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Unread postAuthor: potatoflinger » Sun Jan 06, 2008 7:58 pm

Nice, especially the paint job!
Some good ammo for .75" is paintballs, marbles, and ice slugs.
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Unread postAuthor: DYI » Sun Jan 06, 2008 8:09 pm

The valve will only have opened a small fraction before the disk bursts. This is more like a ball valve than a triggered burst disk. Also, when you say loud, do you mean loud inside, or loud outside? Because the MBDC with the same barrel size is quiet even at 500 psi.

Great paintjob though :D
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Unread postAuthor: thespeedycicada » Sun Jan 06, 2008 8:25 pm

Well its powerfull even with the ball valve. what other ways caan you trigger burst disc's?
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: elitesniper » Sun Jan 06, 2008 8:28 pm

you can use a blow gun and tap it in your gun and connect it to an aircompressor or orther airsource like DYI 's MDBC gun and my gun
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Unread postAuthor: Velocity » Sun Jan 06, 2008 8:30 pm

DYI wrote:The valve will only have opened a small fraction before the disk bursts. This is more like a ball valve than a triggered burst disk.


Might that depend on the pressure which the burst disk bursts? If he has a burst disk that breaks at 25 PSI, and he has the thing pressurized to 100 PSI, it will be essentially a ball valve. But if the burst disk breaks at 100 PSI, and its pressurized to 100 PSI... then it will probably be a good deal better than the ball valve... but still, a plain old burst disk without the ball valve would be the best by far.

I've always been interested in a burst disk to follow a primary valve... though, it makes it very inconvenient, for you get the annoying-ness of the burst disk combined with the restricted flow of the primary valve... and only for slightly better performance of the main valve.

Almost forgot: Nice cannon.
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Unread postAuthor: thespeedycicada » Sun Jan 06, 2008 8:31 pm

Ok so fill it just before the disc bursts the open up the blowgun?
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: elitesniper » Sun Jan 06, 2008 8:35 pm

tap in a blow gun to you gun ok? then connect that blow gun to your air compressor you air compressor has like 100 psi right? then when you press the blow gun the pressure fills your chamber till its burst , its just like pumping it till it blows but much faster and efficient.
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Unread postAuthor: thespeedycicada » Sun Jan 06, 2008 8:47 pm

sounds good! but i need a temporary soulution before i can get a drill hhmmm...
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: Novacastrian » Sun Jan 06, 2008 8:49 pm

Just figure out the best number of layers of foil to get it to burst just before the pressure you have filled to. Like rmich said.
That way you get near maximum flow. :)
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Unread postAuthor: elitesniper » Sun Jan 06, 2008 8:54 pm

you dont have a drill? howd you get that shrader valve in? just wondering :lol:
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Unread postAuthor: thespeedycicada » Sun Jan 06, 2008 8:59 pm

i was at my grandparents we just moved from MN and the builders of my new house forked up bad so we are stuck in our tiny rental and the tools are packed away. im kinda up sh!t creek rigth now!
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: elitesniper » Sun Jan 06, 2008 9:06 pm

maby youcan go to a local lumbar yard or somthing and ask if you can drill something :lol: just a thought though haha
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Unread postAuthor: benstern » Sun Jan 06, 2008 9:20 pm

thespeedycicada wrote:Well its powerfull even with the ball valve. what other ways caan you trigger burst disc's?


Sgort87 made a great one:
http://www.spudfiles.com/spudtech_archi ... hp?t=15544
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