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250 PSI copper riffle

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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250 PSI copper riffle

Unread postAuthor: super spuder » Mon Jul 16, 2007 10:43 am

well i was talking to my friend the other day about spud guns... and he said that he would pay me to build him one... so after some talking he decided he wanted me to build a small coper rifle about 1 meter in length to shoot marbles... what i am wondering is would a blow gun be good enough to let the air out fast enough... or am i going to have to build another piston valve ? or do you have any other good ideas for valves?
edit : he wants to run it at about 250 psi
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Last edited by super spuder on Mon Jul 16, 2007 11:27 am, edited 1 time in total.
trying to decide on a new project, probably something small.
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Unread postAuthor: iPaintball » Mon Jul 16, 2007 10:48 am

What's a blow valve?
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Unread postAuthor: noname » Mon Jul 16, 2007 10:50 am

That's exactly what I thought as soon as I read this.
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Unread postAuthor: Velocity » Mon Jul 16, 2007 10:55 am

Make a piston valve... a blowgun wouldn't exhaust fast enough (I assume blow valve means blowgun?)
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Unread postAuthor: noname » Mon Jul 16, 2007 11:00 am

If that's what he's talking about, then no, a blowgun won't be able to shoot a marble. I also wouldn't advise you to build a piston valve, since the last thing you attempted was a pneumatic made of DWV cell core ABS, "sealed" with duct tape. I would also advise your friend not to buy anything from you unless he wants to die early.
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Unread postAuthor: super spuder » Mon Jul 16, 2007 11:24 am

it is made from copper... AKA wont explode... and by the way i have a new valve in my gun now with O rings on it
edit- i have made other guns since that one to... i just dont bother posting them on here
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Unread postAuthor: noname » Mon Jul 16, 2007 11:48 am

super spuder wrote:it is made from copper... AKA wont explode...


It will if he runs it at 250 psi, because seeing from the other stuff you've made you probably can't solder or sweat fittings well enough to hold that kind of pressure.
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Unread postAuthor: lukemc » Mon Jul 16, 2007 11:49 am

buy THIS
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Unread postAuthor: frankrede » Mon Jul 16, 2007 12:19 pm

super spuder wrote:it is made from copper... AKA wont explode... and by the way i have a new valve in my gun now with O rings on it
edit- i have made other guns since that one to... i just dont bother posting them on here

Well thats a relief, now the world know that ticking time bomb will still blow up, but at least the timer looks nice.
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Unread postAuthor: super spuder » Mon Jul 16, 2007 12:22 pm

frankrede wrote:
super spuder wrote:it is made from copper... AKA wont explode... and by the way i have a new valve in my gun now with O rings on it
edit- i have made other guns since that one to... i just dont bother posting them on here

Well thats a relief, now the world know that ticking time bomb will still blow up, but at least the timer looks nice.

what ????? that makes no sence at all
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Unread postAuthor: mopherman » Mon Jul 16, 2007 1:02 pm

well you could use a 1/4 qev to pilot. or you might be able to get away with a blowgun if your piston has orings and is a near perfect seal
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Unread postAuthor: noname » Mon Jul 16, 2007 1:22 pm

It makes no sense to you because you don't understand it.
Great metaphor!
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Unread postAuthor: MrCrowley » Mon Jul 16, 2007 2:21 pm

I say it would be safe at 100psi if you know how to solder but at 250psi leaving that kind of pressure with your friend is a bit dodgy, if it blows both of you are screwed.
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Unread postAuthor: Brian the brain » Mon Jul 16, 2007 2:26 pm

I wouldn't trust anybody with my metal guns...
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Gun Freak wrote:
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: Hotwired » Mon Jul 16, 2007 3:09 pm

A blowgun would be good enough to pilot a marble cannon but is really too small for direct flow control.

Grab a QEV and copy one of the copper QEV designs round here.
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