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250 PSI copper riffle
Posted: Mon Jul 16, 2007 10:43 am
by super spuder
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
Posted: Mon Jul 16, 2007 10:48 am
by iPaintball
What's a blow valve?
Posted: Mon Jul 16, 2007 10:50 am
by noname
That's exactly what I thought as soon as I read this.
Posted: Mon Jul 16, 2007 10:55 am
by Velocity
Make a piston valve... a blowgun wouldn't exhaust fast enough (I assume blow valve means blowgun?)
Posted: Mon Jul 16, 2007 11:00 am
by noname
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.
Posted: Mon Jul 16, 2007 11:24 am
by super spuder
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
Posted: Mon Jul 16, 2007 11:48 am
by noname
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.
Posted: Mon Jul 16, 2007 11:49 am
by lukemc
Posted: Mon Jul 16, 2007 12:19 pm
by frankrede
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.
Posted: Mon Jul 16, 2007 12:22 pm
by super spuder
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
Posted: Mon Jul 16, 2007 1:02 pm
by mopherman
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
Posted: Mon Jul 16, 2007 1:22 pm
by noname
It makes no sense to you because you don't understand it.
Great metaphor!
Posted: Mon Jul 16, 2007 2:21 pm
by MrCrowley
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.
Posted: Mon Jul 16, 2007 2:26 pm
by Brian the brain
I wouldn't trust anybody with my metal guns...
Posted: Mon Jul 16, 2007 3:09 pm
by Hotwired
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.