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C19O's Coaxial Marble Gun

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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On a rating of 1 to 4 how good is my marble gun?

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C19O's Coaxial Marble Gun

Unread postAuthor: c19o » Wed Jan 24, 2007 8:46 pm

Here is my coaxial marble gun. I used 1/2" copper for the barrel and 2" sch40 for the chamber. I might replace the ball valve with a sprinkler valve soon though, this ball valve was all i had at the time.
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Also here's the some pics of the piston, the bumper, and inside the gun.

Front of the piston
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Back of the Piston - I had to use the piece of pipe so the piston would bump into the bumper instead of the male adapter
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Inside the gun
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Bumper - Its not very elegant, but it works!
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Damage Pics

Marble gun damage compared to pumpmaster 760 bbgun at 10 pumps
and cloud .177 cal bbmg
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back of aluminum plate where marble went through
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Last edited by c19o on Mon Feb 12, 2007 1:00 am, edited 4 times in total.
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Unread postAuthor: LGM » Wed Jan 24, 2007 8:52 pm

Nice, how did you connect the copper to the PVC?
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Unread postAuthor: c19o » Wed Jan 24, 2007 9:06 pm

I used a 1/2" to 3/4" reducer then hooked that to a 3/4 male adapter, that to a 3/4" to 1" reducer, then the 1" reducer to a 1 and 1/2" reducer, and that to a coupling. I made a mistake in my first post, my chamber is 1 and 1/2" not 2".
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Unread postAuthor: LGM » Wed Jan 24, 2007 9:08 pm

Thanks, i'm thinking of doing something similar to this.
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Unread postAuthor: PVC Arsenal 17 » Wed Jan 24, 2007 9:16 pm

Nice. Any details on the valve? Piston, diaphragm?
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Unread postAuthor: c19o » Wed Jan 24, 2007 9:25 pm

i used a coupler for the body of the piston and a disk of 3/16" hard neoprene
off of mcmaster for the sealing end. used a sander the grind the coupler down. I will post a pic of the piston and inside the gun in a few minutes. It's probably be a 1/4" coupler for the piston , i don't know cause i ground away the writing on it.
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Unread postAuthor: c19o » Wed Jan 24, 2007 10:30 pm

i just added pics of the piston, bumper, and inside the gun to my first post.
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Unread postAuthor: imablackskater » Thu Jan 25, 2007 6:06 pm

i have been wanting to make a piston operated gun for a while but i dont know how to get there air out to have the piston come back and by the way really nice gun
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Unread postAuthor: c19o » Fri Jan 26, 2007 9:24 pm

dude u just use a ball valve, sprinkler valve, blowgun, just any kind of valve to get the air behind the piston out.
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Unread postAuthor: ballad of NJ » Sun Feb 04, 2007 12:15 am

good gun but my only suggestion is stick with one or the other copper or pvc
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Unread postAuthor: frankrede » Thu May 03, 2007 10:34 pm

ballad of NJ wrote:good gun but my only suggestion is stick with one or the other copper or pvc

now, why would you say something idiotic like that?
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Unread postAuthor: rednecktatertosser » Wed May 23, 2007 2:57 pm

nice coaxil design. ive been wanting one. now i might just make one.
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Unread postAuthor: potatoflinger » Wed May 23, 2007 5:19 pm

Great Gun
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