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Automatic semi - full pneumatic system

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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Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Mon May 08, 2017 5:31 pm

V4CcwST.jpeg
6C8kvWU.jpeg
Hello everyone !
I have built this basic model of a system for a future weapon. It works at this present time, with compressed air at 4 bar, but it would be possible to feed a definitive version with CO2.
It is not really a weapon, just the test system, but functional. The final version will be the same design with other materials, which will be able to withstand the pressure of about 20 bar.
The good: It's a lot of fun to shoot to play. The bad: the ammunition cost is extreme, so I have only used it in the experiments, recovering the ammunition, in a controlled environment, and not giving much pressure not to deform quickly by the impaction the ammunition. They are spherical .22 caliber of lead.
The food is with the small compressor of my 25 liter workshop, which is what I have available.
Upload a short video to youtube that I leave here. I will make the corresponding diagrams shortly and I will upload them here.
The experiment fires with two modes in automatic, mode 1, twelve rounds per second, and mode 2, 5 rounds per second. Also fires in semi automatic.
The idea is to do something similar to a replica of air soft, but with heavier ammunition :D . I've thought about using 3/16 "or 1/4" steel spheres, we'll see.
This model is built with syringes of various types, fiberglass, and ordinary materials that I have in the workshop.
Soon I will upload more photos and diagrams. Best regards

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Re: Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Tue May 09, 2017 10:35 am

Válvula oscilante y de paso de aire.jpeg
The system works like this:

Automatic:

When in position "A", the air enters by "2", making back
The plunger that opens the "air valve" that communicates with the gun barrel.
Here the pressure is high, that of the diparo.
When in position "B", the air of the "oscillating valve" escapes by "1", and the spring
Returns, closing the "air valve".
The frequency of the cycle is regulated by the volume of "3" (40 ml for 12 cycles per second).
The bigger, the longer it takes to fill and overcome the resistance of the spring, and therefore more
Time between cycle and cycle.


Semiautomatic:

When partially closed, (approximately 90%), port "1", the air can not escape
Rapidly from the oscillating valve.The cycle is interrupted, allowing one-at-a-time firing.
The plunger returns to position "A" due to leaks between this plunger and the housing.


Automatic slow:


When the "1" port is closed by 70%, the "oscillating valve" performs spaced and adjustable cycles, about 5 per second
approximately.
The maximum frequency is about 18 to 20 cycles per second, with a frequency control volume of about 10 ml
approximately.

The diagrams of the firing and loading mechanism of ammunition are missing. I'll upload photos and diagrams.
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Re: Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Tue May 09, 2017 2:54 pm

Sistema disparo, 1.JPG
These are the diagrams of the firing and loading system of ammunition,
Which works associated with the oscillating valve and air passage valve.
If anyone has any doubts, please let me know. regards
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Re: Automatic semi - full pneumatic system

Unread postAuthor: jackssmirkingrevenge » Tue May 09, 2017 9:25 pm

Another fantastic project, bravo! That rate of fire control is genius.

The fact that it's all achieved with home made parts and basic tooling makes such a sophisticated project all the more impressive, well done!
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Re: Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Wed May 10, 2017 8:51 am

jackssmirkingrevenge wrote:Another fantastic project, bravo! That rate of fire control is genius.

The fact that it's all achieved with home made parts and basic tooling makes such a sophisticated project all the more impressive, well done!


Thank you Jack ! I forgot to mention that the tube where the ammunition lodges, enter about 80 lead balls, is pressurized through a small pressure regulator used for airbrushes, (see photo). This maintains at 0.6 - 0.8 bar, to make the ammunition enter.
Actually this is a simple experiment, which taught me a lot. An intermediate step between the design on paper and something useful as a pneumatic weapon.
As I said before, the ammunition cost is very high, and that's what I do not like. I think of getting a co2 + pressure regulator tank and try this, because in full auto the air expense is quite high.
My ammunition box of 500, almost completely disappeared, (deformed, lost ammunition), in a couple of days, while testing.
I have another small video to watch in more detail the operation. I'll post it here soon.
Regulador presión cargador municiones.jpeg

Vista general experimento.jpeg
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Re: Automatic semi - full pneumatic system

Unread postAuthor: jackssmirkingrevenge » Sat May 13, 2017 8:12 pm

As I said before, the ammunition cost is very high, and that's what I do not like. I think of getting a co2 + pressure regulator tank and try this, because in full auto the air expense is quite high.
My ammunition box of 500, almost completely disappeared, (deformed, lost ammunition), in a couple of days, while testing.


This is one of the reasons I tried to move towards more powerful automatics with lower rates of fire.

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Re: Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Sat May 13, 2017 11:42 pm

Great shots!!!! :bounce: Does it work with air? Or co2?
In the case of my experiment, there is no problem with reducing the number of shots per second. The system has to regulate this. Actually debría to use air soft ammunition of 6mm, should work equally, but the problem is that I do not like hahahaha is like throwing "nothing" ... Half of the success of this toy, because that's it, is the box to retain Ammunition I'm building one of these, and the evidence says it's going to work. I have been able to throw a lot of time without wasting lead spheres.

To enhance this, In terms of power, the oscillating valve should act on another type of trigger valve, from the usual ones for co2, which are triggered by percussion. It would basically be something like the diagram, although the trigger valve I drew does not have to be this type.
The ammunition loading system could be the same.
I think the oscillating valve would be for semi automatic and full automatic firing mode control, time shots quantity control, and timing control of the pneumatic actuators of the ammunition loading system. It could be powered by co2, through a regulator to lower the pressure.
Valvula oscilante y válvula de disparo.jpeg
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Re: Automatic semi - full pneumatic system

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Re: Automatic semi - full pneumatic system

Unread postAuthor: jackssmirkingrevenge » Mon May 15, 2017 6:23 am

Great shots!!!! :bounce: Does it work with air? Or co2?


This was with high pressure air, basically it's this valve coupled with this magazine.

the problem is that I do not like hahahaha is like throwing "nothing"


I know what you mean, half the fun of these projects is actually doing some damage! That being said, airsoft projectiles will still make an impression if you shoot them fast enough, this is at 850 psi:



You'd need stronger fittings to use higher pressure though...

Your design reminds me of some paintball guns I've had the "pleasure" of working on:

Image

Image

Image
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Re: Automatic semi - full pneumatic system

Unread postAuthor: hectmarr » Mon May 15, 2017 6:13 pm

I'm impressed with what these soft air balls can do .... 850 fps !! A significant amount of pressure.
Very didactic animations. Truthfully, I've never had one of these to pry. A charm of construction and precision, although these designs, would be impossible to build by me. That is why I have to design this, which is much simpler, in the constructive, but not so much in the design itself.
I liked the valve you designed, just because of the relatively simple to build, and that works !. regards
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