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u2-piston rifle

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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Unread postAuthor: Skywalker » Mon Aug 06, 2007 10:45 am

Very nice! I like that stock configuration. I'd say you could afford a longer barrel though, if you wanted it, as large as your chamber volume is.

So let me get this straight: the barrel slides right through the tee, the endcap goes on the back of the barrel, the piston slides in the barrel, there's a hole through the barrel corresponding with the bottom leg of the tee, and there's a ring of pipe inside the barrel that the piston seats against? That's pretty slick: your piston is always going to align right since it is always inside the barrel.

@JSR: word up, dude. Efficiency is especially important if you only have a bike pump to work with! I want my sweat to count, lol!
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Unread postAuthor: noob of noobs » Mon Aug 06, 2007 4:08 pm

I'm confused (again...) :cry: How do you seal it with an o-ring?
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Unread postAuthor: experament-u2 » Wed Aug 08, 2007 5:46 am

Skywalker wrote:So let me get this straight: the barrel slides right through the tee, the endcap goes on the back of the barrel, the piston slides in the barrel, there's a hole through the barrel corresponding with the bottom leg of the tee, and there's a ring of pipe inside the barrel that the piston seats against? That's pretty slick: your piston is always going to align right since it is always inside the barrel.


no the piston is made of 2 sealing faces of a syringe and they slide through a syringe tube (glued into the tee) and seal against the rear of the barrel.
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