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Regulated SCUBA air?

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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Regulated SCUBA air?

Unread postAuthor: From_Hamsterdam » Fri Aug 17, 2007 10:55 pm

Would this work? has it been done before?
Scuba tanks have two regulators one attaches to the bottle one is attached to the mouth piece. If i was able to get a spare reg and cut the hose in between the bottle and mouth piece and attach a female quick disconnect could i attach this to my gun?
the hose on my current reg is rated to 300psi so i could extend it with compressor hose pipe(also rated at 300psi).

Does any one know if the intermediate pressure (after first reg) could be different for different brands?

Can a sprinkler valve handle 140psi or higher?

http://entertainment.howstuffworks.com/scuba1.htm
First stage - The first stage attaches to the cylinder. It reduces the pressure from the tank (3000 psi or 204 ATM) to an intermediate pressure (140 psi or 9.5 ATM).

Image
SCUBA regulator, showing second stage (left) and first stage (right)
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Unread postAuthor: f.c » Sat Aug 18, 2007 4:50 am

i think it could work. depending on you're gun this would work exceedingly well on a strafer. is you're gun a plinker or a strafer ?
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Unread postAuthor: VH_man » Sat Aug 18, 2007 6:32 am

bahhh!

if youve got that, make a more complex gun, like a Mechanical BBMG.........................
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 18, 2007 6:47 am

VH_man wrote:if youve got that, make a more complex gun, like a Mechanical BBMG.........................


With a setup that could feed 500 psi+ I'd be thinking screw efficiency, just make a high pressure cloud.
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Unread postAuthor: From_Hamsterdam » Sat Aug 18, 2007 7:30 am

I am going to use it on my improved version of this http://www.spudfiles.com/forums/semi-completed-semi-auto-shell-gun-t8892.html complex enough? :D I have added a larger chamber and improved the air flow by about 300%.

With a setup that could feed 500 psi+ I'd be thinking screw efficiency, just make a high pressure cloud.

it won't go over 140 psi (hopefully) if i connect it up to the mouth piece or B.C.D. hoses. If you connected it up to the hose attached to the gauge it will be closer to 500psi+ or connect it directly to the tank for 210 bar of "blow up in your face" fun. :lol:

Any one know the pressure rating of a sprinkler valve?
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Unread postAuthor: VH_man » Sat Aug 18, 2007 7:47 am

haha yes. make the shells out of brass like the nerf gun some guy made, and make it auto, with blowback.....


RATATATATATATAT (dinkdadaladinkdinkdink) muahahahaha!

yeah. i tried once to make a shell-fed, semi-auto nerf gun, and it halph worked. some day ill post the loading/ejecting mechanism. its based of the AR15 extractor/ejector, and its quite complex, but easy enough to create by hand. i did mine without a dremel........... its nice, however, because all the bolt has to do is move foward and backwards and everything is done for you. the only problem was the whole stripping the shells off the magazine......... kinda tough to coreograph.

and a sprinkler is ususally rated to about 125 PSI, at least mine are. i breech that pressure rating however, when i bring my Marble sniper up to 150 PSI (yes im crazy, it has PVC parts........), i have never had a problem. i say go with it.......
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Unread postAuthor: potatoflinger » Sat Aug 18, 2007 9:44 am

The rating on my sprinkler valves (Rainbird cp-100's) is 150 psi, but I haven't taken them that high yet.
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Unread postAuthor: From_Hamsterdam » Sat Aug 18, 2007 11:21 am

why should i make the shells out of brass? it won't work with blow back. i will try to make it auto but doubtful.

what is a dremel?
I know how hard it is to make this kind of thing without the proper tools. This one is so simple to make. The bolt is a piece of pipe, no hooks or ejectors needed, the shells feed consistently (except for one i accidentally stepped on).

mine has only 1 moving part not including the modded sprinkler valve.

so it might be okay to take it up to 140psi. Will fast filling and firing make it more likely to explode?
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Unread postAuthor: kablooie » Sat Aug 18, 2007 7:18 pm

Are you going to post this idea? It sounds very cool. I am trying to make a semi auto but I am going to have to buy a bunch of tools. :(
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Unread postAuthor: From_Hamsterdam » Sun Aug 19, 2007 3:56 am

link to that gun is in the 4 th post down.
http://www.spudfiles.com/forums/semi-completed-semi-auto-shell-gun-t8892.html

If you are having any trouble making it just ask.
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Unread postAuthor: Redcoat » Sun Aug 19, 2007 4:44 am

awesome I'm doing this next week i think i saw two decrepit scuba tanks under the house.
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Air

Unread postAuthor: Solar » Sun Aug 19, 2007 7:35 am

Image

Use a scuba BC disconnect system like I did. you can get them in 1/4 or 1/8 inch npt from sherwood.
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Unread postAuthor: From_Hamsterdam » Sun Aug 19, 2007 6:05 pm

Use a scuba BC disconnect system like I did. you can get them in 1/4 or 1/8 inch npt from sherwood

that is great idea this will save me a lot of money
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Unread postAuthor: Pilgrimman » Sun Aug 19, 2007 6:13 pm

@ From_Hamsterdam

A Dremel, or more correctly, a Dremel tool, is a tool that has interchangeable bits. It rotates much faster than a drill, and is good for grinding away excess material, among other things. It is also a somewhat good cutting tool, if you have steady hands.

@ anyone else

Please expand or correct this definition.
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Unread postAuthor: VH_man » Sun Aug 19, 2007 6:44 pm

yes, dremels are the ultimate tool. if you dont have one, get one, even if it isnt a great one. i havent had a situation where it hasnt gotten the job done..........
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