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Primitive med pressure sprinnger

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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Primitive med pressure sprinnger

Unread postAuthor: metalmeltr » Sun Nov 14, 2010 7:03 am

The chamber is 6x3/4" the barrel is 1/2x43" these values mean nothing the barrel length is just the piece i had laying around.
The 1/4" ball valve is spring actuated by a coil spring that i had laying around. I just got my fridge compressor setup and i have been shooting at about 300psig, i am limited by only having a 300psi gauge.
One quick question shouldn't a grease gun hose withstand friggy presures, it was rated to 4500psi, but an air bubble got under the outer casing of the hose.

How would i model this 1/4" ball valve in GGDT.
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Attachments
craftsman inflator.jpg
I used to use this for inflation up to 200psi
craftsman inflator.jpg (2.08 KiB) Viewed 1080 times
air chuck.JPG
The seal in the origonal airchuck wore out so i cut it off, installed hose barb and put this lock on couplerin place
air cannon.JPG
Yes i polished the barrel
postion after firing.JPG
I hold the valve closed with zip ties, when ready to fire i cut them, this is the poistion after firing, the fill valve was made though this procdeure
http://www.spudfiles.com/forums/how-to-make-a-threaded-schrader-valve-t19609.html

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Unread postAuthor: lemming124 » Mon Nov 15, 2010 12:52 am

interesting
doesn't it get annoying having to constantly replace zip ties?
maybe a system similar to the one here would be preferrable http://www.airgununiverse.net/beginner1.html
oh and doesn't the term "springer" refer to airguns that use a spring propelled piston?
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Unread postAuthor: Technician1002 » Mon Nov 15, 2010 12:56 am

Is there a reason you restricted the size of the air passage from the chamber to the barrel to 1/4 the area? May I recommend using a 1/2 inch or larger ball valve to feed a 1/2 inch barrel?
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Unread postAuthor: metalmeltr » Tue Nov 16, 2010 6:47 pm

The only reason for the rstrictive valve is that is gun was not origonally intended for high performance, this is an earlier incarnation of it http://www.spudfiles.com/forums/my-air- ... 20662.html
I would like to put a larger valve or a QEV on it but it hasnt happened yet.
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