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3000 psi gun

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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Unread postAuthor: Hotwired » Sun Oct 22, 2006 7:55 am

Sure:

http://www.anderson-bolds.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=AB&Product_Code=AB71216SN2BL00N0C111P3&Category_Code=PV2

And the exact same one for a bit less:

http://www.donburgerinc.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=DB&Product_Code=DB71216SN2BL00N0C111P3&Category_Code=PV2

1/4" NPT connections.

Funnily enough theres another link floating about spudfiles for a 3000psi valve: http://www.surpluscenter.com/item.asp?UID=2006062521510310&item=9-6115&catname=hydraulic

Even cheaper but it says it uses Standard American Equivalent 16 ports whatever they are.
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Unread postAuthor: Slugfoot » Sun Oct 22, 2006 12:27 pm

Thanks a lot.
They are quite expensive though :shock: . Small ports but adequate for a pilot valve in a piston gun I imagine.

I'll ask about valves when I go to check out this hydraulic tubing....never know there may be a bargain to be had. They may even cut and tap the parts for me for a nominal price.

I'll keep you all up to date on what I find out.
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Unread postAuthor: SpudStuff » Sun Oct 22, 2006 12:29 pm

Check Ebay for these there are often lots for 10 valves or so for like 30-40 bucks.
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Unread postAuthor: Slugfoot » Sun Oct 22, 2006 12:52 pm

^Good idea. I was on there last night looking for bottles. It didn't occur to me to look for valves. (Must've been tired.)
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Unread postAuthor: reaper613 » Sun Oct 22, 2006 1:43 pm

how would you fill it, cause u cant just hook it up to a compressor, you would have to buy a new scuba tank or co2 bottle for every shot, and you cant have any fittings between the tank and valve b/c they wont hold the pressure
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Unread postAuthor: Slugfoot » Sun Oct 22, 2006 2:09 pm

I was thinking along the lines of a small calibre one, about 15mm perhaps, the chamber of which could be pressurised from a scuba bottle or similar. Theoretically, it could be pressurised with a stirrup pump for a Logun air rifle. They will handle in excess of 3000psi easily but are hard work.
As for fittings I'll just have to do some research and see what's available/affordable. I'm sure there must be fittings around otherwise the other parts wouldn't exist would they? :wink:

ps...sorry if I just hijacked this thread.
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Unread postAuthor: CpTn_lAw » Sun Oct 22, 2006 3:03 pm

if you plan on pumping the tank up to 3000psi then let the air out in one move, you're doing a very bad thing, and it would probably your last thing...200 bars means 200 time the tank volume in it...so, you should consider a blow out time of a few seconds, pushing hard like a rocket, so it would probably send you back flying a few meter, + it is stupid to spnd that money for a unmakable project.

what you could do, is adapt it to some relay valves and another high pressure tank (say 30/40 bars) and make it a semi auto. that would have a considerable recoil, an inimaginable power, and out of 200 bars, you could do approx 300 shots without any problems. so you'd better buy a small scuba, a regulator, a high pressure sprinkler and some thick steel as a barrel.
I would make it a quite small size though, say 1.8cm or so...a ball bearing or marble sniper!!!
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Unread postAuthor: Recruit » Sun Oct 22, 2006 3:43 pm

Ok you there are places to recharge scuba tanks at near beachs and lakes
normally. also please post your address so we know where to send some flowers for your grave if you build it.
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Unread postAuthor: s18022 » Sat Oct 28, 2006 3:44 pm

I'm not sure i am going to but if i ddo my dad will make me use top notch materials so i dont kill myself.
Thanks for all the replies. :D
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Unread postAuthor: OwThatsMyEye » Sun Oct 29, 2006 9:47 am

OK sounds like a good idea. but there is no way you could "quickly tap" a blowgun trigger with 3000psi behind it, more lickly you would have to hit it with a hammer. plus you would probly be shooting mashed pototas out of it not to metion the recoil would be be pretty crazy to. but other than that go for it.
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Unread postAuthor: ProfessorAmadeus » Sun Oct 29, 2006 10:44 am

The recoil from this would be just like knocking the valve off witch could easily kill you. The tank goes 40 mph when the valve is knocked off and think what would happen if you where holding it? All this info was from a recent MythBusters. You could use a pony bottle though which are very small tanks that you use to surface if you run out of air.
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Unread postAuthor: subterranean » Sun Oct 29, 2006 11:14 am

yeah i think you should watch that episode of mythbusters then think about what you would actually be building
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Unread postAuthor: mark.f » Sun Oct 29, 2006 12:54 pm

Bah... you guys need to untangle your various masses of panties over this.

3,000 PSI is a lot, but with a smaller chamber volume recoil could be reduced. The reason the tank could go 40 MPH with the valve knocked off was that it had time to speed up. Brace the cannon with some angle steel mounted to a tree or a bag of quickrete buried in the ground and all that energy will be used to push the projectile and nothing else.

Believe it or not, there ARE fittings available fairly cheaply that can handle 3,000 PSI of McMaster. I'm ordering several for an upcoming project. There are even fittings that go up WAY higher than this as well.

Valves would be difficult, but you could probably make some sort of tee valve to fire the cannon.

In short: quit bitching about something just because it involves the words "3,000 PSI". Compared to some of the pressures you see industrially, 3,000 PSI is sitting on a whoopee cushion. Grease fittings are even rated up to 10,000.
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Unread postAuthor: ProfessorAmadeus » Sun Oct 29, 2006 1:15 pm

OK you go and make this. It is completely useless unless you get some sort of regulator. Lets see you can buy a first stage regulator for like 100 bucks and that knocks down the pressure to like 400 psi. Then you can build you barrel sealing piston valve out of sch 80 steel. That really is the only thing that you can do. And just releasing all that air from the tank at once would require like a 200 ft barrel so this is getting a little expencive.

And yes I pulled that number out of my ass.
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Unread postAuthor: s18022 » Sun May 18, 2008 5:31 pm

you would get a metal stand with car shocks and and electronic egnition system i may be crazy but i am not dumb
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