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Cool New Pneumatic

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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Cool New Pneumatic

Unread postAuthor: goose_man » Fri Apr 13, 2007 1:32 pm

Okay, here we go. This is my first serious attempt at a pneumatic cannon. It uses a 3/4" QEV. It fires .5" steel ball bearings. The pilot side of the setup has (from pilot to back) a pressure gauge, a blowgun, a ball valve with 1/8" NPT on one side and female paintball threads on the other, an 88 gram adapter, and finally, the 88 gram cartridge.

My cannon uses a breech loading mechanism adapted from one developed by someone on spudtech a while back. I don't remember who, so please post and give appropriate credit if you do remember. It is a ball valve with a hole drilled in the side while the valve is in the closed position. I load the ammo (.5" steel ball bearing) from the side of the ball valve and then turn the valve into the open position to make ready for firing.

The barrel is a 36" long brass hobby tube with an OD that fits nicely into .5" PVC and an ID that fits the ball bearings perfectly. I also have a small piece of this same type of tube inside the ball valve. I was going to use magnets to hold the ammo in place, but luckily I got a bit of dried glue in the tube while gluing the tube into the ball valve. This makes the fit tight enough to hold the ball bearings in place until pushed.

My chamber is pretty self explanitory, and my chamber:barrel ratio is 3:1. I've only fired it at 15 PSI due to a lack of space (I live in the suburbs), and it put a 1/3" hole into an old door. The QEV is rated to 125 PSI, and my gauge goes up to 100 PSI. I would have made the whole thing metal and bought a higher gauge, but due to the pressure limit on the QEV it's not worth making the cannon heavier. I can't wait to fire it at 100 PSI though!

I think I got the pics up right, but if not, I'll keep trying. I'm new to this, so any comments/suggestions/criticisms are welcome. Hope you like!

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-goose_man
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Unread postAuthor: spudthug » Fri Apr 13, 2007 1:44 pm

wow thats pretty awesome...is there a reg on ur c02? if not it is dangerous to be turning it on and off...but anyway i like ur breach loader i am actually working on a big breach loader right now....
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: iPaintball » Fri Apr 13, 2007 1:50 pm

That is wicked! Like spudthug said though, if you don't have a reg or a pop off valve, it's not to smart to be shooting that... I love that breech loader!
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Unread postAuthor: FeLeX » Fri Apr 13, 2007 2:11 pm

How many shots you get from that co2 tank? Nice gun!
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Unread postAuthor: lukemc » Fri Apr 13, 2007 2:13 pm

first off very nice! i like the breech load a lot. you sould try and put a suppot underneath the barrel so there isnt as much stress on th joints
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Unread postAuthor: PAspuder » Fri Apr 13, 2007 2:21 pm

I like the breach loading mechanism. Your ball bearing idea is great, especially for that size barrel, and the breach loader. Nice JOb!
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Unread postAuthor: goose_man » Fri Apr 13, 2007 3:20 pm

spudthug wrote:wow thats pretty awesome...is there a reg on ur c02? if not it is dangerous to be turning it on and off...


Well, the CO2 comes out slowly and I can turn it off when I see the pressure gauge get to 100 PSI. That takes a little under 10 seconds to get to though. Do you still think it's dangerous? If so, I will add a pop-off; which, come to think of it, is probably a good idea anyway- just in case.

-goose_man

EDIT: I don't know how many shots I get but I've fired at least 10 blank shots (no ammo) at about 80 PSI so far, and it is still filling.
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Unread postAuthor: pyromaniac » Fri Apr 13, 2007 3:32 pm

I have been wandering for a while when someone woudl post a ball valve breech.

This is the first qev on pvc ive seen.
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Unread postAuthor: goose_man » Fri Apr 13, 2007 6:48 pm

Okay, I found where I think I got the breech-loading ball valve idea from, so credit goes to Chewy- in spud-heaven...here's the link:
http://www.spudfiles.com/forums/wasp-mk2-t77.html
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Unread postAuthor: Thursto » Fri Apr 13, 2007 6:59 pm

Wow that is really cool, ilove the Breech loading system, didnt think of something like that. Nice job.
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Unread postAuthor: ArticWolf » Fri Apr 13, 2007 8:37 pm

Cool cannon love the breech load Idea and mabe if you get a regulator too you might be able to use a bigger co2 tank. Good job though :)
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Unread postAuthor: spudthug » Fri Apr 13, 2007 8:53 pm

hmm it may be a little unsafe because if something happens and u cant get it off it will go boom....so i recomend a 125-150 psi pop off
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Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: experament-u2 » Fri Apr 13, 2007 9:57 pm

yea it might be unsafe (kinda) but that is a sweet gun goose_man and im looking forwards to seeing some more guns soon

btw welcome to spudfiles
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Unread postAuthor: Mr.Russ » Sat Apr 14, 2007 6:50 am

that breech loading system is genius, even if you 'borrowed' it off someone else.

Good canon all up but you should put a barrel support
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Unread postAuthor: trae08 » Sun Jun 24, 2007 11:47 am

that is a very nice cannon. i like the way you adapted the co2 into it i dont think ive ever seen it done like that so good job
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