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2.5" piston

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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2.5" piston

Unread postAuthor: jssizzle » Sat May 05, 2007 11:03 am

Sorry in advance for the "noobish" question, but this is for a bet I made with a friend and really need some help. I'm sure you all have been in the same position.

My friend bet me I couldn't make a potato gun out of spare parts around my house. I found some 2.5" pipe left over from a tennis ball barrel, and have found the right fittings etc. to make a coaxial. Except, of course, for the piston. I've been trying everything that I can get my hands on, but nothing fits quite right in the pipe.

So: Anyone ever made a coaxial with a 2.5" chamber? What could I use for my piston?

Thanks
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Unread postAuthor: homedepotpro » Sat May 05, 2007 11:11 am

do pop cans fit, fill them with like hot glue, or you could try wax from candles
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Unread postAuthor: schmanman » Sat May 05, 2007 11:21 am

well, If you're looking to make a cannon out of stuff around your house, some small diameter pvc, a 2-liter or 20-24 oz coke bottle, and some hairspray. then poke a hole in the side, and stick a match in. ghetto, but it's been done dozens of times.

I would stick with the coaxial, it's better in every way.

like homedepotpro said, make one out of hot glue.

a 2 inch endcap might fit well, too. or a .5 inch endcap. the 2 inch is more likely, though.
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Unread postAuthor: jssizzle » Sat May 05, 2007 11:30 am

Thanks for the suggestions. I was gonna go run to the hardware store to get some hot glue so I'll probably go with that.
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Unread postAuthor: homedepotpro » Sat May 05, 2007 11:55 am

make sure you have lube for the piston
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Unread postAuthor: schmanman » Sat May 05, 2007 6:59 pm

jssizzle wrote:Thanks for the suggestions. I was gonna go run to the hardware store to get some hot glue so I'll probably go with that.


If you have to run to the hardware store, doesnt that mean you loose the bet?
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Unread postAuthor: hi » Sat May 05, 2007 7:25 pm

you could use epoxy, but you wold have to lube the hell out of the mold.

you could maybe use a baseball bat (probably not worth it in terms of cost) and wrap it in duct tape.

anything thats round and fits.
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Unread postAuthor: lukemc » Sat May 05, 2007 7:40 pm

jssizzle wrote:Thanks for the suggestions. I was gonna go run to the hardware store to get some hot glue so I'll probably go with that.


CHEATER!!!! oh well :roll:
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Unread postAuthor: Atlantis » Sun May 06, 2007 12:35 am

Cut a tennisball in half, flip the halves around and bolt them together, the inside of the tennis ball should seal against the barrel.
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Unread postAuthor: Mr.Russ » Sun May 06, 2007 12:38 am

thats a good idea atlantis, i never would have thought of that
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Unread postAuthor: jssizzle » Sun May 06, 2007 9:02 am

I cleared the hot glue thing with my friends . . . I already had a hot glue gun so we decided that that was a "household" material.

Good idea atlantis . . . I was going to a tenis ball as a bumper but that might work too.
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