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simple co-ax with attached stock

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: McCoytheGreater » Wed Feb 03, 2010 6:54 pm

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Unread postAuthor: Marffy » Wed Feb 03, 2010 8:52 pm

hah. thats was a fail. (video) i'd get a better breach. How come it was so weak? it couldn't penetrate the milk jug.
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Unread postAuthor: BigGrib » Wed Feb 03, 2010 9:05 pm

My guess is that because the breech split, all the pressure was lost, and therefore the projectile failed to penetrate the milk jug.


You should make a breech out of cast epoxy.
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Yea, that's definitely going to get you at least a tazer.

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Unread postAuthor: chinnerz » Thu Feb 04, 2010 12:22 am

BigGrib wrote:My guess is that because the breech split, all the pressure was lost, and therefore the projectile failed to penetrate the milk jug.


You should make a breech out of cast epoxy.


spot on mate
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Unread postAuthor: chinnerz » Thu Feb 04, 2010 12:29 am

McCoytheGreater wrote:
chinnerz wrote:video:
it failed btw...
http://www.youtube.com/watch?v=haipQ7xO-Ns


Don't you just hate that?


lol i only just figured out what that was :P
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Unread postAuthor: Patto » Thu Feb 04, 2010 3:36 am

Really good job man !!

Go the aussies good luck with the new breach ..
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Unread postAuthor: chinnerz » Thu Feb 04, 2010 4:44 am

haha, thanks man.
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Unread postAuthor: Keringkien » Sun Apr 04, 2010 10:44 pm

Aussies all they way!! I'm working on my own air rifle now, hopefully get it up to say 300psi and perhaps a 6mm barrel would be handy, if I can get my hands on come copper pellets...anyway mate good luck with your creation, it's holidays for me now so I can get a lot done on this! :P

Edit: Heading down to Bunnings, do you think they have 20mm threaded piping? I'm guessing thats the way to build my chamber. I'm using MRR's base for a piston valve, sill don't understand these things yet, maybe when I test it with my chamber on I'll work it out. Wish me luck guys.
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Unread postAuthor: chinnerz » Mon Apr 05, 2010 1:11 am

well, i wouldn't suggest starting big, maybe make a small one out of pvc first so you can get all the bugs out of it then make a metal version
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Unread postAuthor: Patto » Mon Apr 05, 2010 5:38 pm

how'd you go with your breech ?? did you build a new one yet ??
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Unread postAuthor: chinnerz » Tue Apr 06, 2010 1:09 am

na man i have boon soo busy with school and stuff.... i ended up just using some electrical tape
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Unread postAuthor: Patto » Tue Apr 06, 2010 1:15 am

and how did that go for you ?? is it working again
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Unread postAuthor: chinnerz » Tue Apr 06, 2010 4:40 am

yeah, somewhat.... poor design in my part is starting to manifest... i guess piston rifle number 2 will be better.
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Unread postAuthor: RatedZ4Zoro » Thu Apr 08, 2010 3:12 am

hey great gun,
sorry but this question is a bit off topic but,
i have built a pvc coaxial with a 40mm chamber and cylinder(where piston slides up and down) with a 20mm barrel. My first piston was made of cast hot glue with a 6mm rubber sealing face. my second piston was mae of a 25mm coupling with rubber sealing face bolted on to it. My problem is that the piston seals the barrel, the gun pressurizes but when i try to shoot all the air just escapes out of my blowgun pilot and the piton doesn't even move. Why is this?
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Unread postAuthor: Crna Legija » Thu Apr 08, 2010 4:07 am

how tight is you piston? did you put a equalization port if so try block it up.
if the piston is air tight and you know it make a tiny hole the size of a needle to let air in the chamber
you can also use a bigger pilot valve if it works you need a tighter piston
and try to make piston as light as you can
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