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Full Auto Marble Gun

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: Brian the brain » Sun Oct 15, 2006 5:07 am

If you tilt the mag over to one side, there will be less weight of the marbles on the paddle, and you'll have a better line of sight over the gun..
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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: mark.f » Sun Oct 15, 2006 7:51 am

True. Clever...

I was wondering if I should make the mag like that, but I thought straight up and down would be better.

But, it's done now!
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Unread postAuthor: schmanman » Sun Oct 15, 2006 8:31 am

VERY nice! I like the mag design. looks good, too. how much does it weigh, and what can it shoot through?
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Unread postAuthor: mark.f » Sun Oct 15, 2006 9:51 am

Doesn't weigh much, but it put dents into a wooden fence, (the "dimples"), at about 30 yards away, (when I missed the box in the above video).

But, if I wanted power, I wouldn't have made it fully automatic. You sacrifice a little power for a higher rate of fire because you have to make a small chamber that can be filled quickly.
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Unread postAuthor: stalker » Wed Oct 18, 2006 9:42 pm

Thats a pretty alsome rig you gat goin on but wouldnt a paintball gun work just as well with some marbles in it im not sure so tell me if im wrong. Id try it but my gun is to expensive for me to mess up.
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Unread postAuthor: Mr.Taterhead » Thu Oct 19, 2006 1:19 am

Super Gun and Super Job. I love the paddle trick. I was suprised to see you build a gun that does not use a piston. I have just always seen you praise piston guns and thougth this may be one. Again Great Job. :P
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Unread postAuthor: mark.f » Thu Oct 19, 2006 5:37 am

Yeah, a piston wouldn't have reliable enough equalization properties for this to work with one. I decided to use a quick-exhaust because they equalize only one way with pretty good flow, and you can pilot them with pretty much near anything.
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Unread postAuthor: killagorrila99 » Wed Oct 25, 2006 4:30 am

Doubt it... Could i vent it if I had a plastic end cap on the back of the qev and i hit a nail through it?
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Unread postAuthor: mark.f » Wed Oct 25, 2006 5:40 am

Actually, you probably could pilot it that way, (maybe even before you remove the nail).

On my copper cannon, the piston seals good enough so that I can pilot it just by cracking the ball valve halfway open, (albeit, it takes a few seconds). A Q.E.V. piston seals perfectly in it's carriage and only let's air through the "CYLINDER" port from the "PILOT" port because of the way it's shaped. ANY drop in pilot pressure will fire that sucker.
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Unread postAuthor: Hotwired » Wed Oct 25, 2006 6:51 am

Thats the second time I've been working on an air cannon design I thought hadn't been done, then found a similar existing system.

Ah well, only so many ways to make a semi or full auto pneumatic.

I was thinking of a different feed system, different chamber/barrel layout and a custom piston but its broadly the same firing mechanism using a relief valve to trigger the piston/qev at a set pressure automatically.

Great design anyway :)

I'd hate to put a lawnmower over that grass though :P
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Unread postAuthor: joannaardway » Wed Oct 25, 2006 1:30 pm

markfh11q wrote:Actually, you probably could pilot it that way, (maybe even before you remove the nail).


If the nail didn't remove itself.
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Unread postAuthor: xxxtrasherxxx » Fri Dec 15, 2006 9:51 pm

what kind of air compresser do you use??? mine always stops at about 30 psi. lately its haset been working past 20-25 psi and i need to buy a new one. hope u can help me !!!
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Unread postAuthor: mark.f » Fri Dec 15, 2006 11:55 pm

Whoa. Are you using some sort of car tire compressor?
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Unread postAuthor: c19o » Mon Dec 18, 2006 9:12 pm

cool dude. ive built marbleguns with sprinkler valves before but where did u get that sprinkler valve ive been lookin for 1 like that in a long time..
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Unread postAuthor: MrCrowley » Mon Dec 18, 2006 10:03 pm

ahhhhhummmmm its a QEV :lol:

He probably got it of McMaster im not sure so don't hold me to it, I do know you can get them of McMaster on page 913 or something
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