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Gas operated Marble 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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Gas operated Marble gun.

Unread postAuthor: Redcoat » Fri May 11, 2007 3:33 am

Hi all,

I thought of this idea(but im sure someones done it before) in maths class and i just wanted to hear your thoughts on improvements and modifications i could make.
http://science.howstuffworks.com/machine-gun5.htm this link is just to show you how they work if you dont know .

thanks.
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Snapshot 2007-05-11 18-25-00.gif
this is it im gonna make it into an LMG style frame.It should be sweet.
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Unread postAuthor: jackssmirkingrevenge » Fri May 11, 2007 4:19 am

Sorry to burst your bubble but I'm almost sure it won't work at spudgun pressures. Remember that firearms that use this system have chamber pressures in the range of 30-50,000 psi far higher than anything you could have in an amateur pneumatic.

Of course there's only one way to find out, feel free to prove me wrong, but I'm pessimistic.
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Unread postAuthor: Redcoat » Fri May 11, 2007 4:27 am

ah well.i'm not going to attempt it unless i know or have a really good idea if its gonna work so yeah.
I just wonder.........................mmmmmmmmmmmmmmmmm. i wonder if i had another tube fram the same blowgun like an air hose with a fork in it leading to the barrel and the piston but with the piston one longer so it takes a longr time to get there and so it goes full auto that way.Though it would have been nice to have it like a real gas powered gun.
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Unread postAuthor: jackssmirkingrevenge » Fri May 11, 2007 4:33 am

I think you should be looking at the direct blowback system for inspiration, which is what low pressure firearms such as the Makarov PM use, and also the mechanism I adopted for my cartridge fed prototype.

If you want to stick to a separate gas line for the piston, then having the line fed directly from the valve has a much better chance of working. It would be a good idea to include a ball valve on the line, so you could adjust the flow of air until you get optimum performance.
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Unread postAuthor: Redcoat » Fri May 11, 2007 4:38 am

yeh ive already designed a blowback system for a pistol i am gonna make when i get some cash. :wink:

But if its not too much too ask you could you please draw me a diagram or describe to me in detail your seperate gas line idea? you dont have to but im having trouble visualizing it.

thanks.
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Unread postAuthor: jackssmirkingrevenge » Fri May 11, 2007 5:07 am

idea:

note that the ball valve is only there so you can adjust the airflow until you can find an ideal position for the best performance, once you so this you can lock it in place.
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Unread postAuthor: lukemc » Fri May 11, 2007 6:10 am

what if you used jacks idea but the piolot of the main valve moved the piston giving it a fraction of a second for the marble to drop
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Unread postAuthor: Redcoat » Fri May 11, 2007 3:55 pm

ill try and see if i can get some prts for jack's idea but now that ive slpt on it (im only half awkake and ikep missing keys and my damn stubbby fingers :D )
i think i might give the direct bolw back a go.

The thing is i want a semi auto or a fully auto marble gun which still has alot of power behind it I might even try and build it into a BAR 1918 i really like those and i want the same umph that the BAR has like this

http://www.youtube.com/watch?v=3OqKDVna ... ed&search=

Edit- http://www.petitiononline.com/hds2468/petition.html :wink:
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Snapshot 2007-05-02 18-55-43.gif
This is the design i had for a pistol but for this instead of using a band i use a very light spring behind it in the barrel.And i might also put the magazine on top intstead of below to save on springs.
more info on this design

http://www.spudfiles.com/forums/semi-auto-marble-gun-t7904.html
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Unread postAuthor: jackssmirkingrevenge » Sat May 12, 2007 12:10 am

again, shouldn't the air hole be between the projectile and the bolt?
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Unread postAuthor: Redcoat » Sun May 13, 2007 5:54 am

yeh what that is a picture of is rior to the thing loading that is the gun when the Marble comes up from the magazine and before it gets pushed into position.When it fires its all up in place with the air hole in the middle.

im just wondering if there will be enough pressure to push the bolt back as well as shoot the marble a considerable distance.
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Unread postAuthor: Redcoat » Mon May 14, 2007 4:09 am

I know this is a double post im sorry. :wink:

Would i just be able to have the barrel with an inverted magazine without a piston and just have air going and propelling the marbe forward and then the next marble falls down and caught in the jetstream and so on....?

i didn't think it would work because air would go up the magazine but it would be cool if it did.

I would like to be proved wrong. :wink:
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Unread postAuthor: Redcoat » Mon May 14, 2007 4:09 am

I know this is a double post im sorry. :wink:

Would i just be able to have the barrel with an inverted magazine without a piston and just have air going and propelling the marbe forward and then the next marble falls down and caught in the jetstream and so on....?

i didn't think it would work because air would go up the magazine but it would be cool if it did.

I would like to be proved wrong. :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon May 14, 2007 4:15 am

triple post actually :p

You don't have to have the magazine that's exactly the same diameter as your barrel...

are you planning on pulses of air from your valve, or a continuous flow? In the case of a latter, make an MMG :D in the case of a former, how about a paddle to interrupt the flow of BBs from the magazine, as done here
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Unread postAuthor: Redcoat » Mon May 14, 2007 4:26 am

whats an MMG?

Touche on that "triple" post i don't know how that happened....

And i may try that paddle thing if my other ideas fal.

Anyway, i am having a continuous flow and i would like to know what an MMG is.

Thanks.

Edit- HOw do you get Spud Bux without posting?

Bring Mail Call back to Australia
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Last edited by Redcoat on Mon May 14, 2007 4:46 am, edited 1 time in total.
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Unread postAuthor: skinner » Mon May 14, 2007 4:45 am

Marble Machine Gun
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