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Semi Auto

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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Unread postAuthor: alextheametuer » Thu Feb 08, 2007 3:48 pm

great job on it i think it is great but some of it could have been simpiler and still been semi auto
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Unread postAuthor: akaddis » Wed Feb 28, 2007 1:09 am

I know that you said that you can fire about 2 balls per second. But isn't that only because of the air mechanism? (not because of the loading)

Thanks
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Unread postAuthor: akaddis » Wed Feb 28, 2007 9:42 pm

i really would like some plans for the loading mechanism...or at least a list of parts and where to get them...because I'm not too good with making things of an animation...

Thanks in advance

Sry for double post..hehe
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Unread postAuthor: spudthug » Sat Mar 03, 2007 8:55 am

*wow*? that is a sweet gun you could friggin kill someone with that....lol... wel anyway nice clean design i like the light blue paint its pimp
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Unread postAuthor: lukemc » Tue Mar 06, 2007 4:47 pm

amazing!! like the idea very shwing
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Unread postAuthor: hayden » Tue Mar 27, 2007 10:05 pm

is the stock full of pressure and what is it made of???? i am billding your gun so i need help
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Unread postAuthor: locksmith » Mon Apr 02, 2007 12:51 pm

very nice design.looks like a blast to shoot
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Unread postAuthor: AmYisroelChai » Mon Apr 02, 2007 12:58 pm

alextheametue -You said it could be simpler and still be semi-auto care to explain? Anybody else?

The gun is very nice and thought out.
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Unread postAuthor: pyro6314 » Tue Apr 03, 2007 8:29 pm

Care to elaborate on the pilot vent/ pressure valve you made. I understand the animation but cant put the parts together in my mind.

Sweet gun BTW. Very Impressive :D


Edit: Sry, I should read first :D
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Last edited by pyro6314 on Fri Apr 20, 2007 2:26 pm, edited 1 time in total.
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Unread postAuthor: clide » Wed Apr 04, 2007 8:14 pm

There is a pretty detailed diagram of the slide valve a few posts under the first one.

Basically it is just a tube with a plug in the middle and holes around the pipe on either side of the plug. Then there is a sleeve over the tube so that it can connect the two sets of holes or expose one set to the atmosphere.

As for the loading mechanism, there are more details as to the sizes I used near the bottom of the first page, but I don't have any exact plans or anything.
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Unread postAuthor: tarmann_90 » Fri Apr 13, 2007 12:30 am

that is by far the most ingenious and original thing ive ever seen for a potato gun
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Unread postAuthor: Kenny_McCormic » Tue Apr 17, 2007 4:26 pm

put a solinoid on it with some custom circitery for full auto
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Unread postAuthor: tarmann_90 » Wed Apr 18, 2007 12:15 am

what sizes of pipe are you using? is the smallest 1.5" for the body? and the slider/trigger 2"? also what pressure are you using in it?
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Unread postAuthor: clide » Wed Apr 18, 2007 2:09 pm

The valve body is 1", the chamber is 2", stock is 1/2". The trigger is part of a 1.5" tee and the piece extending back to the slide valve from the trigger is 1.5" SDR21. Sizes for the slide valve pipe are given above the detailed figure, although there is a piece of 1.25" SCH40 around the outer piece of the slide valve so it will connect to the trigger easier.

My compressor only goes up to 100 psi, so I start from there and of course the pressure decreases as I fire.
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Unread postAuthor: pyro6314 » Fri Apr 20, 2007 2:30 pm

What is the limitation on the ROF? I would assume it will still fire when you have a lower pressure but in your video it sounds like a ammo loading problem.

How do you get the air to equalize fast enough. You must have a check valve for it to be that reliable?
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