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a real automatic valve or system !

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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Unread postAuthor: chrissilvermancs » Thu Mar 19, 2009 1:11 am

thanks for the input

well i have seen few "plans" actually but they were not what i was looking for although there was a good one for a full/semi auto combustion that used the design of a car engine that looks tempting.

anyways thanks
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Unread postAuthor: frankrede » Thu Mar 19, 2009 7:09 am

markfh11q wrote:A better example than my work

The above example could be easily modified to full auto by using a pop-off valve for a pilot valve.

The cannon jack posted (images are dead) simply uses a Q.E.V. with a pop-off pilot, and an air source. I used a 90 PSI pop-off to reduce air consumption, but it really depends on what type of compressor you have.

The ROF is controlled most effectively with this design by the flow of air into the cannon, so your trigger valve (NOT pilot valve, the fill valve) should be chosen carefully. A flow regulator could be added as well.

As to the ammo feeding, the paddle system linked in this and jack's post or a simple blow-forward bolt will work. The reason you haven't seen "a single auto design shooting larger than a BB work" is simply because you haven't looked hard enough. GalFisk made one that shot airsoft pellets. :)

Also, if you're referring to BB machine guns in your first post, have a look in the wiki at "Vogt Pattern" guns. DR made one that shot tennis balls, and another one that shot golf balls.

EDIT: here's another example of the "paddle" system. This is the one built by DR (BewareOfDog) that shoots golfballs. Again, a simple sprinkler pilot will allow this cannon to fire full-auto, but in this case you'd be going for as much fill-flow as possible... air consumption is pretty heavy.

Video of DR's S.A. GB Gun
I am in possession of that semi-auto feeder, I still need a project to use it in.
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Unread postAuthor: chrissilvermancs » Sat Mar 21, 2009 2:55 am

im going to start the build next weekend but the only thing i cant decide on is weather or not it should be done out of 2.5 inch pipe or 3 inch so there is no tight squeeze and this is only the barrel and piston im talking about

but i do have about 15 ft 2.5 inch pipe laying around so thats no problem (found it in a store one day and i bought them out because its so scarce to see in stores)
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