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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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Marble Gun

Unread postAuthor: mark.f » Sun Sep 17, 2006 9:21 pm

full.jpg
Gun...
full.jpg (23.44 KiB) Viewed 270 times

piston.jpg
Piston...
piston.jpg (24.79 KiB) Viewed 270 times


This is just the bastard child of an off-hand comment to my friend one day at school that I felt like building a marble rifle. After I got home, I was on a mission...

The barrel is 1/2" x 2' and the chamber is 3/4" PVC and elbows formed into a stock-type-shape-thingy. The valve is a small barrel sealer inside of a 1-1/4" tee, and the pilot and fill valve is a 1/4" ball valve with a male quick disconnect. Eventually, I might upgrade to a 1/4" Q.E.V. with a real-like blowgun trigger, but for now the ball valve works great. The piston itself is a D cell battery with some neoprene bolted onto the front and wrapped in duct tape. As always, I lubricated it with Hoppe's gun oil.

Right now, I can't really see where all my marbles are going. I CAN hear bushes and twigs snapping whenever I fire into the woods, though, so I can bet they're going pretty fast.

Might get a video up soon, it's too dark and I've got too much to do for now.
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Last edited by mark.f on Sun Oct 20, 2013 2:58 pm, edited 2 times in total.
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Unread postAuthor: experament_u2 » Mon Sep 18, 2006 2:22 am

Iv always wanted to reply first to a post

Anyway i relly like the design good job nice and clean
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 2:32 am

DAYUM MAN, Its sweet! If I were you id make the chamber larger than 20mm.
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Unread postAuthor: mark.f » Mon Sep 18, 2006 5:30 am

Hey, it can all be rebuilt if I felt like it. Only cost about 15 bucks!!!

I was thinking about making the stock out of 1-1/4" or 1-1/2", but after piloting there is still enough air to make the marble go fast enough anyway.
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Unread postAuthor: schmanman » Mon Sep 18, 2006 2:41 pm

nice! did you use primer? or was it clear primer? also, isn't the piston a bit heavy? or did you empty it out? a lighter piston = better performance.
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Unread postAuthor: mark.f » Mon Sep 18, 2006 10:41 pm

Not always...

I did use clear primer. I've still got plenty...
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