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2" Piston Cannon Questions

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" Piston Cannon Questions

Unread postAuthor: spudkilla224 » Wed Jul 30, 2008 4:37 pm

I've been looking at how 2" barrel sealing piston cannons are made, and i cannot figure out how to make the piston a tight fit. i know i could use o-rings, the bolt kind of piston.

the barrel sealing cannon i'm building now, has a 2" SECH40 Tee, and my vent adaptor has a 2" SCH40 pipe inserted into the end with the bushing reducer.

but how do i over come the "LIP" in the middle of the Tee section of the fitting. there will always be a space inbetween the piston and the 2" Tee.

any help would be appreciated.

I'm very sorry, i accidently posted this question in the wrong fourm. it was suppose to be in the pnuematic form.
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Unread postAuthor: jrrdw » Wed Jul 30, 2008 5:12 pm

Grind, Dremal, file, sand it out. I used my metal lathe and took out the pipe stop that way.
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Unread postAuthor: jonnyboy » Wed Jul 30, 2008 5:13 pm

For a 2'' piston I have heard axe cans are good pistons. Regarding the lip are you talking about how it gets slightly smaller inside the tee? Because when you insert a fitting or piece of pipe it becomes all level.
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Unread postAuthor: spudkilla224 » Wed Jul 30, 2008 5:41 pm

No actually the ledge drops downward.
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Unread postAuthor: FishBoy » Wed Jul 30, 2008 6:28 pm

just so you know, you'll need a compressor for a 2" piston, not a bike pump
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Unread postAuthor: kablooie » Wed Jul 30, 2008 7:36 pm

I have a 2" piston gun, as well as a 3" gun that I pump up with a bike pump, so you can do it with a bike pump. It does take some patience though.
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Unread postAuthor: psycix » Fri Aug 01, 2008 5:06 am

Are you using a 2" porting in a 2" tee?
It will not work properly if you use a 2" piston with a 2" porting!
use a 2,5" or 3" tee and piston if you want to get it to work with 2" porting, or else reduce the porting.
The piston needs frontal area to open.
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