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Piston Gun Design and Idea!

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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Piston Gun Design and Idea!

Unread postAuthor: Mitchza89 » Thu Jun 05, 2008 10:47 pm

Hey guys, after the failure of my last pvc piston gun, I thought Id come up with a new gun that doesn't use any glue, or compression. Just pure threading.

I made a marble gun purely out of poly parts. I screwed a 1/2x1'' threaded bush into the 1'' tee, and got a length of all thread poly pipe, stuck a pile of thread tape on, and 2 threaded nuts over the pipe and screwed it into the tee untill I had the sealing face of the pipe just where I wanted it. I also came across "gasket fittings" which have a nice o-ring around the back. So when you screw it in fully, it compresses the o-ring and you don't have to use thread tape.

I'm casting a hot glue piston. I didn't want to use my mums pots and pans to melt down the glue otherwise Id wreck them. I also thought that how and the hell and I'm I gonna safely get the glue from the pan and into the mould carefully enough that I didn't stuff it.

I came up with a new method thats floorless when melting the stuff down. I layed a few sticks over a sheet of aluminium foil and stuck it in the griller. When it was nicely melted down, I stuck on some gloves, folded the foil over a few times so the glue didn't leak out, and squeezed it over the mould. It works absolutely perfectly and the best part is, you can squeeze out as much as you want so you can make large pistons very quickly!

Just make sure ya wear gloves and don't burn yaself!

:D!
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Last edited by Mitchza89 on Thu Jun 05, 2008 10:53 pm, edited 2 times in total.
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Unread postAuthor: ghostman01 » Thu Jun 05, 2008 10:50 pm

what do you put in the mold so it doesnt stick to the sides ?
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Unread postAuthor: Mitchza89 » Thu Jun 05, 2008 10:51 pm

I just use Vasiline mate. Anything like that, so KY lubricant jelly would be perfect. Most blokes have a tube of that laying around somewhere.....

:D
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Unread postAuthor: microman171 » Thu Jun 05, 2008 11:59 pm

Hehe KY Jelly...

Sounds like a good gun and im looking forward to some pictures :D
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Unread postAuthor: ghostman01 » Fri Jun 06, 2008 12:20 am

i might have already used all mine up ...... lol im the same age as crowley
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Unread postAuthor: Carlman » Fri Jun 06, 2008 12:30 am

damn it i was about to start making the first poly piston gun :evil:

oh well have fun.

Mine will have 1" porting though :D
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Unread postAuthor: Mitchza89 » Fri Jun 06, 2008 12:49 am

1''? :D Very nice. I just finished the gun. She works quite well actually so I'm happy :D.

Best part is, is I can take off the 1/2'' marble barrel and add a golf ball barrel :D.

I'll have to crank this thing to 200psi and see how we go!
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Unread postAuthor: Carlman » Fri Jun 06, 2008 5:29 am

Mitchza89 wrote:I'll have to crank this thing to 200psi and see how we go!


bloody oath!

neeeed some pics man :D
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