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coaxial piston valve

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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coaxial piston valve

Unread postAuthor: urgle the danish cow » Wed Dec 15, 2010 10:19 pm

hello spud files. its been awhile since ive done a piston valve so im glad to be done with poopy ball valves
Specs;
Barrel: 1/2 inch pvc
Chamber: 1 1/4 inch pvc around barrel
Exhaust valve: 1/2 inch ball valve
filling: air compressor thing. usually at 160 psi from an ex-propane tank that can be stored in a back pack for mobility
Piston: a 3/4 inch end cap. the sealing face is a rubber O-ring(type 14 i believe) that is epoxied onto the barrel. so the sealing face is not attached to the piston so i dont need large sheets of rubber to cutout and place on pistons.
main ammo: AA batteries.
tell me what you think thanks
[youtube]http://www.youtube.com/watch?v=mTOWi6rOjMw[/youtube]
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Attachments
IMG_0308.JPG
das Gewehr
IMG_0309.JPG
hinunter das Fass
IMG_0310.JPG
the exhaust valve
IMG_0311.JPG
one handing it, it is fairly light
IMG_0301.JPG
cheap calculator before
IMG_0302.JPG
cheap calculator after
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Unread postAuthor: Technician1002 » Wed Dec 15, 2010 11:07 pm

Nice job. Did you get the idea of a valve seat from my Mouse Musket? That is built almost exactly like mine but smaller. The Musket was a 2 inch chamber with a 1 inch barrel.
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 16, 2010 1:42 am

I would have gone with 5318008 but nice job :D
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Unread postAuthor: CpTn_lAw » Thu Dec 16, 2010 4:45 am

JSR, you keep making me dream... :D :roll:

Very nice launcher, simple, yet effective, have fun with it ;)
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"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
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Unread postAuthor: Vincenzo » Thu Dec 16, 2010 5:55 pm

Looks as if you glued in the back bushing. I would have used a female adapter in place of the coupling and a threaded bushing to make it serviceable. But I mean if your piston is only a cap then i guess the only servicing it would need would be to put in an actual new cap... Other than that nice job.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: urgle the danish cow » Thu Dec 16, 2010 6:09 pm

Technician1002 wrote:Nice job. Did you get the idea of a valve seat from my Mouse Musket? That is built almost exactly like mine but smaller. The Musket was a 2 inch chamber with a 1 inch barrel.


no i did not. i was unaware that you did that with the mouse musket.
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Unread postAuthor: urgle the danish cow » Thu Dec 16, 2010 6:11 pm

Vincenzo wrote:Looks as if you glued in the back bushing. I would have used a female adapter in place of the coupling and a threaded bushing to make it serviceable. But I mean if your piston is only a cap then i guess the only servicing it would need would be to put in an actual new cap... Other than that nice job.


yea i did realize the consequence of that after i glued it. but its only pvc which is cheap. :roll:
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Unread postAuthor: urgle the danish cow » Thu Dec 16, 2010 6:12 pm

jackssmirkingrevenge wrote:I would have gone with 5318008 but nice job :D


haha im old so i should act that way :)
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Unread postAuthor: lol » Thu Dec 16, 2010 6:47 pm

nice cannon! I like how you put the sealing face on the barrel I have not seen that before :o
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Unread postAuthor: pneumaticcannons » Fri Dec 17, 2010 11:02 am

I built a coax a few months ago. I was I my us house when I built it but then we went back to our current location. Only now did I clalculate that the c/b ratio was like 7 to 1. Lol gotta fix that when we go back for winter in 3 days. :P
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Unread postAuthor: urgle the danish cow » Fri Dec 17, 2010 4:38 pm

lol wrote:nice cannon! I like how you put the sealing face on the barrel I have not seen that before :o


its very simple. i just epoxied an o-ring to the rear end of the barrel so all the piston does is apply pressure instead of apply a seal and pressure. i find it simpler and easier
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