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semi auto marble gun

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semi auto marble gun

Unread postAuthor: pat123 » Tue Jun 05, 2007 2:21 pm

this is my design for a marble gun. i wanted to see what everyone thinks before I build it.
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Unread postAuthor: pyromaniac » Tue Jun 05, 2007 2:39 pm

this will work but each time you will loose pressure. You will go from 90 psi one shot then to80psi one shot to 70psi.
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Unread postAuthor: Pete Zaria » Tue Jun 05, 2007 3:22 pm

Your general concept is good.

You should do some research on the magazine-fed breech loaders people have built around here. Personally, I prefer the BC-arms-style bolt action.

Using a QEV or modified sprinkler for your main (second) valve will greatly increase performance. Also, I'd suggest making the gun's built-in air tank as big as you can stand to.

Instead of a ball valve to let air into the gun's tank from the compressor, why not use a cheap air regulator or check valve so that you don't have to open the valve between shots?

Peace,
Pete Zaria.
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Unread postAuthor: iknowmy3tables » Tue Jun 05, 2007 3:41 pm

it depend on the compressor, the ball valves may prove unimpressive. sprinkler valves will not work if they receive a sudden blast of air they wil not shut automatically. a good way is to have the fill valve replaced with a needle valve or flow regulating valve and the second to be replaced with a sprinkler valve if you like. now for the loading system you must have a plan on that or else they will just all blast out at once, so you must use a loading paddle system, or a blow-forward bolt you should research both in fact I'll help

heres the best paddle example i could find http://www.spudfiles.com/forums/full-au ... t4108.html
heres a good blow forward bolt example
http://www.spudfiles.com/forums/viewtopic.php?t=160&
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