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Portable CO2 BBMG advice.

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Portable CO2 BBMG advice.

Unread postAuthor: _-J-O-R-D-A-N-_ » Mon May 31, 2010 8:47 am

So recently, I have gotten the amazing idea of creating a portable gas powered BB machine gun.


It started when I brought myself a Co2 tank from the Hardware store. (they’re used for nail guns). The pressure system that they are used for, are sadly discontinued for a reason that I am not aware of. So I decided to improvise.
I have made my own design using metal threaded piping that takes the same principle as SodaStream machines. Where pressing down on a button, pushes down on the nozzle button on the tank, releasing a burst of gas.


If there are any safety concerns in regards to the construction, please don’t hesitate to discuss them. Based on my logic and previous experience, I have a strong belief that the current structure is safe.
Here are some pictures.
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The help that I am in need for is an idea for a mechanism to push the rod forward onto the Co2 bottle button.

At first I thought of using some form of pulley connected to a trigger, but the button is relatively stiff and would not be pushed very easily.

Another idea I had was to use some rubber tubing around the rod to pull it down, but I have no idea of how I could make the compression go backwards when I want to release the trigger.

My third idea was to use something that is powered by a motor. I just cannot think of a device that could do the trick, and that could fit onto my gun nicely.

What are your thoughts?
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Unread postAuthor: jhalek90 » Mon May 31, 2010 9:45 am

use a lever as a trigger, much in the same way blow guns work.

That would be the easiest way i can think of.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: _-J-O-R-D-A-N-_ » Mon May 31, 2010 9:54 am

Hmm good idea. I know it may be asking for alot but is it possible if you could draw a diagram of it on the first picture?

I have an idea of what you mean, but words are often open for interpretation unlike diagrams.
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Unread postAuthor: Zoltar9879 » Mon May 31, 2010 1:05 pm

I take it that the rod is pushing directly onto the safety pin (not sure of the real name) that is in the co2 bottle? So there isn't any valves other than what is included already in the tank? Neat idea. :) I can't tell which end is suppose to be the front in the first picture, the left or the right? It looks like there should be a barrel on the L joint running above the tank and going to the right, with the push button part where the bbmg would have a stock.
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Unread postAuthor: _-J-O-R-D-A-N-_ » Tue Jun 01, 2010 12:14 am

Lol. I definately wouldnt trust my skill with creating a secondary valve, simply because I do not like the idea of handling pressures over 2000 psi.

And yes you are correct in that the barrel will screw onto the L joint. I am planning on using a cloud design with 3 mm BBs (the same size as the ammo used in the BBMGs in shooting galleries at fairs)

I figured I could use a lever for a trigger (thanks jhalek90), but I would want the simplest way of attatching such a design to the current construction of the gun. Perhaps making a bigger woodden handle with some holes to attatch the lever onto.
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Unread postAuthor: Crna Legija » Tue Jun 01, 2010 12:46 am

did you get that Co2 from bunnings in oz if you did you need a valve to open close it right after the threads on the tank, those tanks have a burst disk once opened don't close i would use a pressure washer handle
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Unread postAuthor: _-J-O-R-D-A-N-_ » Tue Jun 01, 2010 12:51 am

I didnt quite understand what you were trying to say.

Sorry.

The tank already has an in built valve that only needs to be pressed to release the gas, and this gas gets release around the rod.
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Unread postAuthor: gluegunner » Sat Oct 30, 2010 4:36 am

thats a lota zip ties, lol
very clean! good work
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Unread postAuthor: Molybdenum » Sat Oct 30, 2010 8:37 am

It looks like your tank has the treads commonly associated with paintball tanks. You may be able to pick up a paintball air system for cheap that will work with that.

Something like this
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Unread postAuthor: Mpeddlesden » Fri Nov 12, 2010 12:21 am

I doing something a but like this but a little bit different.


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-11-06143646.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-11-06143646.jpg" border="0" alt="Photobucket"></a>


<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=2010-11-06143626.jpg" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/2010-11-06143626.jpg" border="0" alt="Photobucket"></a>



<a href="http://s878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/?action=view&current=video-2010-11-11-17-54-38.mp4" target="_blank"><img src="http://i878.photobucket.com/albums/ab343/tyjgjfghjgjtyutjg/th_video-2010-11-11-17-54-38.jpg" border="0" alt="Photobucket"></a>


VIDEO ^^^^^^^^^^^^^^
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Unread postAuthor: ilovefire » Fri Nov 12, 2010 12:23 am

what pressure can one of those take?
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Unread postAuthor: jhalek90 » Fri Nov 12, 2010 12:46 am

_-J-O-R-D-A-N-_ wrote:Lol. I definately wouldnt trust my skill with creating a secondary valve, simply because I do not like the idea of handling pressures over 2000 psi.


You mean 850 psi.

I belive c02 is usually stored at 850 psi(room temp).
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 12, 2010 12:56 am



I think you've taken the idea of a "hammer valve" a bit too literally :D
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Unread postAuthor: Mpeddlesden » Fri Nov 12, 2010 4:14 am

ilovefire wrote:what pressure can one of those take?


=3,500 psi
=241.31 Bar

Its a bit.
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