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P. 2 Very Simple airgun1!

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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Re: how does it work

Unread postAuthor: Antonio » Thu Feb 28, 2008 9:41 am

[quote="littlebro05"][/quote]

Hey here is an animation of how it works. As though this is an animation of one of my other airguns, this one works similar; just that the valve is inside the bottle.
Image
If you dont get this one plz send another msg as I dont have much time now to explain.
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Unread postAuthor: littlebro05 » Thu Feb 28, 2008 3:35 pm

Yeah i've seen it i love it... lol it' looks mad, though i was just wondering if that's how the air gun works ... what i wrote above was right?

The hammer works like that pushes on ball valve trigger i pulled... valve closes and hammer pushes forwards? because if that's how it works then i might be able to pull it off
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Unread postAuthor: Brian the brain » Thu Feb 28, 2008 4:34 pm

Defenitely something interesting and undeniably Dutch going on here...


I tried to make this once...years ago...and failed horribly.
I had to throw it' s plywood carcas in the bin pretty quickly...
I couldn' t get the valve to seal.
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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: Antonio » Fri Feb 29, 2008 2:50 pm

Brian the brain wrote:Defenitely something interesting and undeniably Dutch going on here...


I tried to make this once...years ago...and failed horribly.
I had to throw it' s plywood carcas in the bin pretty quickly...
I couldn' t get the valve to seal.


Image On this pic you can c that I used a piece of silicon tubing to make sure the whole system seals off. I tried melting the ball bearing into the plastic bottle cap but this didnt make it 100% airtight.

littlebro05 wrote:
The hammer works like that pushes on ball valve trigger i pulled... valve closes and hammer pushes forwards? because if that's how it works then i might be able to pull it off


I am not sure what u mean man. I am sorry. But it works like this: the barrel is pulled foward so that the barrel spring is pressured'', then when the trigger is pullled the barrel slides back takin a bb and sealin the barrel. When it hits the valve its energy will be converted to the valve. This makes it open for a certain time. Due to the air pressure and spring behind the valve it closes after a small burst of air has been let out''. So yeah its basic. The only problem is with loading as the balls sometimes jam the barrel. Hope this helped
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burst air not piston?

Unread postAuthor: littlebro05 » Fri Feb 29, 2008 3:50 pm

So what your saying is that the gun fires a bb with a burst of air not by
a piston? and it works like....

The spring infront of the barrel drags the barrel / hammer back with the bb... when the trigger is pulled

and eventually hits the air valve releasing a burst of air shooting the bb out of the barrel?

cause it sounds like it will have a lot jamming problems is all... but i'll try it still
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Re: how does it work

Unread postAuthor: Antonio » Wed Jul 23, 2008 6:22 pm

newbmatic wrote:I have just seen one of your amazing homemade air guns. The one that I am very interested in is the one that uses thing thats like a hammer valve. If you could just send me a quick diagram on where everything goes and a real quick explanation as well.


First of all we will look at the poppet valve I used in this project:
Image
Its a ballbearing with a piece of silicon tubing around it that seals the cap of the bottle. The pvc pipe in the bottle is there to support the spring and to give it pretension.
If you have this:
Image
And it doesnt leak you are on to the next step of making the hammer barrel.

It works like this pic below: (be aware that it is a diagram from my most recent gun)
Image
The barrel is cocked in a forward position so that the barrel spring has tension. The trigger catches the a small latch on the barrel. Now it is fully cocked. The trigger is spring loaded so it moves into place automatically. Now that the barrel is in the forward position the loading port for bbs is open so that a bb can fall into the barrel. Btw I use pipping around the barrel to guide the barrel along.
Now when the trigger is pulled due to the pressure of the spring the barrel moves backwards (fast) and closes the loading port. When it is farthest back it hits the ball bearings face and a burst of air is released that propelles the bb. Now the shooter can recock the system for another shot manually using the latch attached to the barrel.
I am sorry that I dont have extra visuals, but at the moment I dont have the opportunity to make ehm. So hopefully this will work out.
I had a better animation in powerpoint but I cant find it no more:S
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Unread postAuthor: Antonio » Wed Oct 29, 2008 6:19 am

twill3rs wrote:i understand how the ball bearing seals off the bottle, but how does the barrel seal against the bottle when it is fired, and why does the tention of the elastic on the barrel not hold the valve open releasing all the air, insteead of one burst.


The barrel is held at the valve using the wooden stock/frame a silicon tube around the barrel makes sure it seals with the cap of the bottle. As you can prob c in the pictures, there is a pvc pipe in the bottle. It is there bc it holds a spring which makes sure that the valve closes after the valve is actuated"". Ofcouse when the elastic band is too tight the valve will stay open, so you have to calibrate it. I hope this helps:)
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Unread postAuthor: twill3rs » Thu Oct 30, 2008 9:06 am

hey can you try and explain how the hammer action (for the barrel) seals against the bottle during a shot
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Unread postAuthor: Antonio » Thu Oct 30, 2008 2:53 pm

as I said its sealed with a silicon tube that goes over the barrel and makes a tight fit with the valve/bottle-cap. If I were you I would first make the valve into the bottle and then go on from there, you will c that sealing it wont be such a problem.
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Unread postAuthor: littlebro05 » Thu Oct 30, 2008 3:08 pm

twill3rs wrote:hey can you try and explain how the hammer action (for the barrel) seals against the bottle during a shot


You probably already know that this isn't a semi-automatic and you have to cock the spring every time you fire. Basically if I'm right, the strength of the "barrel spring" is weaker than the pressure "inside the bottle.

In which case you would have to probably use the same springs in the "hammer valve" and the "barrel" itself. That way both springs have equal force, but the hammer valve will be further supported with the pressure behind the hammer. Therefore the barrel spring has insufficient force to push back the hammer after it's been shot meaning the hammer has been sealed.
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It's Nerf or Nothing.

Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
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Unread postAuthor: Antonio » Thu Oct 30, 2008 4:45 pm

[quote="littlebro05"
You probably already know that this isn't a semi-automatic and you have to cock the spring every time you fire. Basically if I'm right, the strength of the "barrel spring" is weaker than the pressure "inside the bottle.
[/quote]

the springs can be the same but after all it doesnt really matter as you can always change the prepressure(length) of the spring.
Oh yeah btw I never said it was semiauto did I? Trying to take it down eh? The title of the post already says its a very simple airgun (with high efficiency btw)
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Unread postAuthor: littlebro05 » Fri Oct 31, 2008 1:22 am

ant wrote:[quote="littlebro05"
You probably already know that this isn't a semi-automatic and you have to cock the spring every time you fire. Basically if I'm right, the strength of the "barrel spring" is weaker than the pressure "inside the bottle.


lol sorry about that, when I first saw it I thought it wa ssemi-automatic. I really need to make one of those guns as a "sniper rifle" with spring mag :D
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It's Nerf or Nothing.

Don't start crying when I play this as my hobby, Paintball, Airsoft and Nerf are equally good hobbies, except you can play Nerf in public. Good day! Hmph!
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Unread postAuthor: twill3rs » Fri Oct 31, 2008 7:46 am

i know how the ball seals against the bottle, and i can do that with the help of an o- ring instead of tubing.;
an o-ring is glued onto the bottle cap and a marble pressed against it making a seal.
however i dont know how the barrel seals against the bottle top.[/img]
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Unread postAuthor: Antonio » Fri Oct 31, 2008 6:53 pm

littlebro05 wrote: I really need to make one of those guns as a "sniper rifle" with spring mag :D


Yeah should be awesome! I would say just go for it:)
(btw except high efficiency: with a 0.5liter bottle @ 7bars you can easily get more than 50shots in the 200-350fps second range, btw it does go higher(400fps))
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Unread postAuthor: Antonio » Fri Oct 31, 2008 6:57 pm

twill3rs wrote:i know how the ball seals against the bottle, and i can do that with the help of an o- ring instead of tubing.;
an o-ring is glued onto the bottle cap and a marble pressed against it making a seal.
however i dont know how the barrel seals against the bottle top.[/img]


As I have said SEVERAL times now! You achieve a seal by a tight fit of the barrel tube slidertube against the bottlecap. The barrel(which is the hammer fits tight(but slides) in the slidertube. Check this pic:
Image
I dont have better pics as I made these guns a long time ago:)

In this animation the blue tube is the barrel and the black is the slidertube""
Image


Edit: sorry for double post
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