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Pump marble gun

A place to ask general spud cannon related questions.
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Pump marble gun

Unread postAuthor: Gunner » Thu Jan 10, 2008 12:44 pm

Well,I just sketched this and as you can see the trigger mechanism is not ready,but I hope that you will understand how it works. :D Would it be possible to shoot 5-10shots with 5-10Joules of kinetic energy with marbles?The chamber is 1Liter and pressure is 8bar.
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Unread postAuthor: Brian the brain » Thu Jan 10, 2008 12:46 pm

it will work but won't have too much power. It will also fire very inconsistent.
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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: Gunner » Fri Jan 11, 2008 7:18 am

"it will work but won't have too much power"? I understand but how can I make it better?Suggestions :D
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Unread postAuthor: Necrosis » Fri Jan 11, 2008 11:48 am

Gunner wrote:"it will work but won't have too much power"? I understand but how can I make it better?Suggestions :D


Raise the pressure? :roll:

Be careful though.
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Unread postAuthor: Hawkeye » Fri Jan 11, 2008 12:52 pm

Raising the pressure helps, as does using a weaker spring behind the valve. You can also manipulate how long the valve opens by using a heavier hammer or a stronger spring to propel it. The more air you can let escape, the stronger it will shoot. At the expense of number of shots of course.
A fairly large chamber pumped up to 200-350 psi would probably give you a nice repeater.
Keep in mind that a hammer valve tends to self regulate to a degree. As the pressure drops, the valve is naturally less resistant to being opened and more air will escape. Some consistency can be expected from the shots in the middle of the series.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 11, 2008 1:08 pm

Valid points but I think a 1 litre volume is still too low, I would go for at least 3 times that amount.
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