Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 76 users online :: 7 registered, 0 hidden and 69 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

P. 3 Stacked tube

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.
Sponsored 
  • Author
    Message

P. 3 Stacked tube

Unread postAuthor: Antonio » Sun Dec 16, 2007 11:51 am

This is my older airsoft bb gun (it works with 6 mm platic balls; 0.12g). In this design I was working with the stacked tube working as I wanted to make a semiauto gun; based on most spyder paintballs guns. The whole gun is made from scap (everything homemade) from the valve to the soldering of the piping. Further, the gun shoots above 100 m/s (around 360fps). I tested this using a mp3 player and a measured out range for a target. When one shoots you can hear two loud parts(when the gun shoots and when the ball hits). Using audicity you can c how many miliseconds is between the two. By subtracting 340/range from the time that u got you get the exact time (bc the speed of sounds goes at 340m/s and affects your recording). So average speed= distance/time taken. Like this I made an easy and cheap chronograph. The gun runs on compressed air at around 5 bars. As can be seen it is stored in a coke bottle. This way you can shoot about 30-40 times on a 1.5L bottle (0.4 gallon). The guns speed can be regulated'' by the spring which drives the hammer into the valve. The gun can be loaded at the top but I still have to make a magazine. Everytime the gun is shot the barrel slides forward due to friction of the ball and air on the inside of the barrel and thus opens the breech and allows for reloading. Once the gun is recocked (as seen in the picture) the breech closes again due to a pin which connects the barrel and the hammer setup.

Gun with big wooden stock:
[youtube]http://www.youtube.com/watch?v=vmJygL88HsY[/youtube]
  • 0

Attachments
trigger.JPG
Spring loaded trigger setup
oldgn2.JPG
oldgn2.JPG (2.35 KiB) Viewed 9620 times
oldgn.JPG
Valve internals3.JPG
Last edited by Antonio on Mon Mar 24, 2008 7:11 am, edited 19 times in total.
User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Hotwired » Sun Dec 16, 2007 12:16 pm

Great stuff there especially with improvised materials :D

I've gone through the internal layout and it looks like the hammer hits the poppet valve... but I can't see what stops the hammer from keeping the valve open and draining the chamber in one shot.

Is the air blast strong enough to recock the mechanism?
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: Antonio » Sun Dec 16, 2007 12:25 pm

The valve spring behind the popet valve makes sure the valve closes again. Plz check the youtube link inorder to see the working of the gun.
  • 0

Attachments
spyder.gif
This is a picture/animation of the spyder (I didnt make it). This airgun works in a similar way, just that u have to recock it yourself bc the operating pressure is lower.
User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: Hotwired » Sun Dec 16, 2007 12:38 pm

Okeydoke I getcha.

It makes a pretty nice *chunk* when fired even without air :)
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: Eddbot » Sun Dec 16, 2007 12:42 pm

that's pretty sick, i gotta check the wiki to see what a poppet valve is :computer:
  • 0

User avatar
Eddbot
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Tue Oct 09, 2007 6:08 pm
Reputation: 0

Unread postAuthor: Maniac » Sun Dec 16, 2007 12:47 pm

That gun is really sweet i love the design.
  • 0

Coodude26 wrote:
People who laugh really hard at stuff that pisses you off/you getting hurt, who then say "I'm sorry, I can't stop" but you know they easily could.

Mr.C: That's not as easy as you think. It's like me kicking you in the balls and telling you to stop crying.
User avatar
Maniac
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 496
Joined: Tue Oct 23, 2007 5:55 pm
Location: Right behind you
Reputation: 0

Unread postAuthor: bob-a-lu » Sun Dec 16, 2007 12:52 pm

make it a higher pressure and it would be better.




ps sorry but clouds and vortex guns still are better(higher rate of fire).
  • 0

User avatar
bob-a-lu
Sergeant First Class
Sergeant First Class
 
Posts: 138
Joined: Fri Jul 06, 2007 12:24 pm
Location: alabama
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: ALIHISGREAT » Sun Dec 16, 2007 1:00 pm

dude that is cool 8) and pretty ghetto 8) you should make a high pressure one as your next project because it has the potential to become a beasty gun (you could make a semi-auto pellet gun? if you used higher pressure?)
  • 0

User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: Antonio » Sun Dec 16, 2007 1:01 pm

Higher rate of fire but highly ineffecient and inaccurate. This gun has a coke bottle used a pressure vessel. So it can be used for plinging games. Clouds use big inpracticle pressure tanks.
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: qbnbountyhunter » Sun Dec 16, 2007 1:45 pm

it reminds me of a German Ruger from WWII, very complex and sophisticated internals, nice bb gun,looks like a lot of fun
  • 0

User avatar
qbnbountyhunter
Sergeant
Sergeant
 
Posts: 85
Joined: Mon Nov 12, 2007 8:17 pm
Location: Los Angeles
Reputation: 0

Unread postAuthor: Antonio » Sun Dec 16, 2007 3:56 pm

bob-a-lu wrote:sorry but clouds and vortex guns still are better(higher rate of fire).



Higher rate of fire but highly ineffecient and inaccurate. This gun has a coke bottle used a pressure vessel. So it can be used for plinging games. Clouds use big inpracticle pressure tanks.
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Dec 17, 2007 3:14 am

bob-a-lu wrote:ps sorry but clouds and vortex guns still are better(higher rate of fire).


A high rate of fire means a lot of waste of ammo, I'd rather have 1 round per second at 4 foot pounds than 4 rounds per second at 1 foot pound. Clouds and Vortex guns have a pathetic individual projectile energy, usually less than 1 ft/lbs, it's only their exagerated rate of fire that makes them seem powerful, the so-called "jackhammer effect".

Great design ant, of course the concept is nothing new but to see that you've managed to make it work using only basic tools and materials is very impressive, congrats.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Antonio » Mon Dec 17, 2007 3:27 am

jackssmirkingrevenge wrote:
bob-a-lu wrote:ps sorry but clouds and vortex guns still are better(higher rate of fire).


A high rate of fire means a lot of waste of ammo, I'd rather have 1 round per second at 4 foot pounds than 4 rounds per second at 1 foot pound. Clouds and Vortex guns have a pathetic individual projectile energy, usually less than 1 ft/lbs, it's only their exagerated rate of fire that makes them seem powerful, the so-called "jackhammer effect".

Great design ant, of course the concept is nothing new but to see that you've managed to make it work using only basic tools and materials is very impressive, congrats.


Hey thnx allot for backin me up here! I never liked the idea of clouds. They waste so much air and ammo. Yeah I know my design isnt really new. But I never saw someone make something like it here on this forum. I like ur blowforward design as well. I have tried using it on my stacked stube design but it keeps jamming. And as I used plastic balls I cant keep ehm in place with a magnet. But my new post has a trigger that falls into the barrel so that the balls dont roll out. This is better but I know it will cause a problem once I go automatic. Cheers
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Dec 17, 2007 3:47 am

What you can do to stop the balls from rolling out is to cut a groove in the barrel and but an o-ring around it.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Antonio » Mon Dec 17, 2007 4:10 am

jackssmirkingrevenge wrote:What you can do to stop the balls from rolling out is to cut a groove in the barrel and but an o-ring around it.


Ah thnx allot. I should try that sometime. Maybe I can even create backspin on the ball for farther flight!
  • 0

User avatar
Antonio
Colonel
Colonel
 
Posts: 508
Joined: Sun Aug 13, 2006 2:38 pm
Reputation: 0

Next

Return to BB/Airsoft/Pellet Gun Database

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'