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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: urgle the danish cow » Fri Feb 03, 2012 5:27 pm

wyz2285 wrote:The sealing came from a co2 pin valve pin, about epoxy I used one with 360 bar rated.


so like the sealing face from a manufactured co2 gun? do you know the material?
also are your "valve pins" from a blowgun?
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Unread postAuthor: Gippeto » Fri Feb 03, 2012 5:52 pm

Uh huh.

Did you calculate what the fail pressure would be?


Edit: urgle...most co2 guns use urethane for seals.
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Unread postAuthor: inonickname » Fri Feb 03, 2012 10:05 pm

Gippeto knows what he's talking about.

Pressure test it if you want to actually be safe.

And by pressure test, I don't mean pump it up to 300 psi below the working pressure. I mean test it hydrostatically with a safety margin.

And trust me, it can fail.
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Unread postAuthor: urgle the danish cow » Sat Feb 04, 2012 12:44 am

Danke Gippeto
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Unread postAuthor: wyz2285 » Sat Feb 04, 2012 6:36 am

And trust me, it can fail.

:? nobody said anything about Gun Freak´s gun...
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: dahakka » Sat Feb 04, 2012 7:36 am

may be you should use some screws
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Unread postAuthor: Gun Freak » Sat Feb 04, 2012 8:53 am

My gun is held together by threaded fittings and carefully soldered joints and has a valve that has held 2,000 psi over night by another member here. :D
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Unread postAuthor: Lockednloaded » Sat Feb 04, 2012 11:10 am

Gun Freak wrote:My gun is held together by threaded fittings and carefully soldered joints and has a valve that has held 2,000 psi over night by another member here. :D


3000 actually :D
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Unread postAuthor: Gun Freak » Sat Feb 04, 2012 12:40 pm

Gahh I didn't want to say 3000 and be wrong!!! :D
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Unread postAuthor: wyz2285 » Sat Feb 04, 2012 1:39 pm

I belive my epoxy will hold more than your tin weld, it´s 3cm of epoxy in a 1cm2 area to hold only 70 bar...
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Unread postAuthor: Gun Freak » Sat Feb 04, 2012 6:58 pm

I believe that is irrelevant because I only plan on using 400 psi :)
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Unread postAuthor: Goats spudz » Mon Feb 13, 2012 9:02 pm

Do you think Argon would be a suitable propellant gas?
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 14, 2012 2:35 am

Goats spudz wrote:Do you think Argon would be a suitable propellant gas?


It's denser than air so that will mean less performance for a given pressure than if you were using air or nitrogen, but it's less dense than CO<sub>2</s>.
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Unread postAuthor: Goats spudz » Tue Feb 14, 2012 8:45 am

I think ill use Nitrogen then, thanks :D
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Unread postAuthor: wyz2285 » Wed Feb 15, 2012 2:30 pm

Some updates:
My epoxy leaked :( (plz don´t laugh at me), and I know it´s almost impossible to repair it (unless take the valve off, clean the epoxy and glue it again).
So I made a kind crazy decision: make my own valve, with o-ring seal. The advantage is obvious, I can fix the valve on the chamber with screws and when I have to repair the valve, I just have to unscrew it. Well, I made the valve out off nylon, because I don´t have a metal lathe, only my drill press.
Anyway, I made it :P , with 2 o-rings(still need to make the internals). Now I won´t be using 1000 psi, only 60 bar. The area is about 3.33 cm2, at 60 bar it will be 200.4 kg. I´m not worried about the valve blow up, but the screw part, where shout I place the screws?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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