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Pneumatic marble/paintball 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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Pneumatic marble/paintball gun.

Unread postAuthor: moses » Thu Jul 03, 2008 5:36 am

So, I have made a prototype of this, and it was really horrible. I could only pull about 40psi with a hand pump (2.1l capacity). The hopper I made worked OK, 2d pictures don't work because I used a heat gun to bend the pipe away. So to load the chamber it was essentially "Rock'n'cock". Problem was that when I pulled the trigger, the marble was too big to fit through the o-rings I made, so It blocked the barrel and shot the hopper at my head. 50 marbles and a hopper at about 50fps. Pretty hairy. I have solved the o-rings, solved everything except the airflow. I was thinking of making a slightly modified prototype (as pictured) but what I am unsure about is the air supply. The main holding tank, or transfer tank if you will, is a 2l coke bottle, capable of holding 2l of air @ 120 psi. Any higher and it explodes. So if I hook up a 12v compressor to a car lighter, with a psi gauge, and assuming the pump is capable of delivering 11.5l per min at 160psi, then that means that I need to dry fire or live fire about 30 times a minute lest I blow my tank up. Either that or I turn the pump off. I've designed it to fire semi-auto, bursts or automatic provided that the delivery system can cope with it. I will troubleshoot the delivery system later, all I am unsure of is the air delivery. This will be only the second pneumatic anything I have ever made, so can you guys offer any advice?
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Unread postAuthor: Hotwired » Thu Jul 03, 2008 5:57 am

What exactly do you mean by "Intended to be shot out of the window of the passenger seat"?
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Unread postAuthor: MrCrowley » Thu Jul 03, 2008 5:58 am


To all members,


It appears this member wants to do possible 'drive-bys' with a homemade weapon. I cannot think of another reason why he would say what Hotwired just quoted.

Helping this member may contribute to endangering members of the public, so please refrain from helping him until this is sorted out.


Please explain yourself. If you do intend on doing 'drive-bys' then I whole heartedly recommend you and your friends drag along a CO2 tank and fill your soda bottle chamber up with unregged CO2, you'll be surprised by the performance.
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Unread postAuthor: Ragnarok » Thu Jul 03, 2008 6:22 am

Um, what?

It blocked the barrel and shot the hopper at my head.

Pretty hairy.

Any higher and it explodes.

Intended to be shot out of the window of the passenger seat

You're not exactly giving the air of someone that I'd particularly entrust with any gun resembling object more dangerous than a hairdryer.

Explanation needed, and this better be good.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jrrdw » Thu Jul 03, 2008 6:26 am

Sorry guys, locked untill further notice!
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