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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: killagorrila99 » Thu Aug 31, 2006 6:10 am

hmm that vale is steel, isnt it?
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CO2

Unread postAuthor: forwardthinking » Thu Aug 31, 2006 6:12 am

The CO2-tank on this gun has 3/4" pipethreading. Don´t use paintball-CO2-tanks they can explode when you put highpressure air in then.

The valve is brass. The barrel is steel. Got to get back to work now.
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Unread postAuthor: frankrede » Thu Aug 31, 2006 5:07 pm

markfh11q wrote:Anybody know what the threads are on a CO<sub>2</sub> tank valve? Not the threads that screw into the gun, the threads on the valve that screws into the tank that they tell you is a no-no to undo?

Would make a safe chamber for a hybrid or something.

Omg,i was thinking that yesterday,ha,ya i was thinking about using it in a pneumatic though. It would be a pain for me to drill for a shrader though.
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Unread postAuthor: frankrede » Thu Aug 31, 2006 5:25 pm

OwThatsMyEye wrote:
WOW!! wrote:Very nice on that. that thing must weight alot. Got any damage pics??
I dont think confetti is going to have very impresive damage pics. lol

Omg that made me laugh
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Unread postAuthor: djt » Thu Aug 31, 2006 8:01 pm

paintball co2 tanks can explode with high pressure air? ummm no. how could you possibly pressurize air high enough to make it explode without spending thousands of dollars on a compressor that can pump out psi in the thousands?
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Unread postAuthor: SpudStuff » Thu Aug 31, 2006 8:23 pm

High pressure conpressed nitrogen tanks. you can get them to 60000psi
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CO2-tank

Unread postAuthor: forwardthinking » Fri Sep 01, 2006 1:56 am

It´s not the pressure it self which is dangerous it´s the tanks inner coating or something that is flammable in contact with pressurized air. The tanks are rated for 200 bar with CO2, not oxygen. This was told to me by the guy selling these (why would he lie?).
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CO2-tank

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Unread postAuthor: MrCrowley » Fri Sep 01, 2006 2:44 am

to make money :roll: jkz
i saw a scuba tank air compressor for only $17,000NZD not bad huh? :wink:
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CO2-tank

Unread postAuthor: forwardthinking » Fri Sep 01, 2006 5:24 am

MrCrowley wrote:to make money :roll: jkz


Don´t think so. He could have said nothing and made a sale of 100$. So you see he lost money since I had to go elsewhere.
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Unread postAuthor: SniperMan » Fri Sep 01, 2006 5:40 am

So what actually is that tank? That's exactly what i was looking for to put on my bb but just couldn't find one...
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Unread postAuthor: eskilsa » Fri Sep 01, 2006 6:17 am

SniperMan wrote:So what actually is that tank? That's exactly what i was looking for to put on my bb but just couldn't find one...


The tank on the picture is a CO2 1kg tank. You get smaller tanks for paintballguns and slightly lager ones from small fire extinguisher. The fire extinguishers are 1´´ treded.

E
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Unread postAuthor: SniperMan » Fri Sep 01, 2006 6:28 am

eskilsa wrote:
SniperMan wrote:So what actually is that tank? That's exactly what i was looking for to put on my bb but just couldn't find one...


The tank on the picture is a CO2 1kg tank. You get smaller tanks for paintballguns and slightly lager ones from small fire extinguisher. The fire extinguishers are 1´´ treded.

E


Any idea where i might be able to get one like that? With the rounded bottom.... All the ones i saw had a square bottom.
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Unread postAuthor: Brian the brain » Fri Sep 01, 2006 12:57 pm

Oh my god what a load of crap!

CO2 is stored ( for the most part) as a liquid at around 50-60 Bar.
Depending on temperature.The bottles are made to handle that pressure

Air can be stored at 300 BAR, as it is in scuba tanks.Air is compressed into a liquid form at that pressure,( around room temperature.)

Imagine what would happen if you fill a bottle that is meant to hold CO2 with HPA at 300 bar???

CO2 bottles are not meant for that kind of pressure.
You first speak of air, then oxygen.

Iron can rust, in other words oxydize.Pure oxygen would do the same but quite a bit faster.I am not sure if this could cause an explosion but it might.
What will cause an explosion in contact with HP- Oxigen would be rubber seals and certain lubricants.

So forwardthinking...The guy didn't exactly lie, he was just talking out of the wrong side of his digestive system a bit !!He mixed some things up...or maybe you did...
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: )DEMON( » Fri Sep 01, 2006 1:34 pm

So does that mean the fire extinguisher I was using is busy being oxydized on the inside? I think there was rust but I put loads of oil in it. I filled it with water once.
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Unread postAuthor: WOW!! » Fri Sep 01, 2006 1:51 pm

I did the same with mine, fill it with water. I just empyted a bigger one and filled it with water. The small one I have looks like it is lined with stainless. Do you think I should still use it?!
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