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 55 users online :: 4 registered, 0 hidden and 51 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

I HAS FULL AUTO :D

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

I HAS FULL AUTO :D

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 10:35 am

I'm sorry, but this deserved it's own thread :)

[youtube]http://www.youtube.com/watch?v=vXxLMcZWLYs[/youtube]


[youtube]http://www.youtube.com/watch?v=Vp9BVud0JBE[/youtube]

To hell with single shot testing, couldn't wait to try it out with pellets :)

Ten round bursts using unmodded 0.22" (5.5mm) airgun pellets in a 6mm barrel at 100 psi, firing at a 0.5mm (0.02") thick aluminium plate target. The second video is with a greater flow into the chamber and therefore greater rate of fire.

Basically it's this valve coupled with this magazine, simple but effective :)
edit: update 07/04/2009

Here it is with the hopper and BBs as ammo, not 100% reliable but good enough. Note how the rate of fire decreases progressively as the pressure in the compressor goes down. Target was a plastic box.

[youtube]http://www.youtube.com/watch?v=hXM-bPOtJGU&feature=channel[/youtube]


Here's the hopper and valve firing:

[youtube]http://www.youtube.com/watch?v=U_1cN7lhW5c[/youtube]


Unfortunately with the smaller calibre power is down from what it had been with pellets, here's what happened with the 0.5mm aluminium plate, most rounds failed to penetrate it - no video though, too many BBs flying back at my face :roll: but with 450-850 psi on tap eventually it should be a blast, literally :D

Image
  • 0

Attachments
exit.JPG
exit
entry.JPG
entry
entry.JPG (29.52 KiB) Viewed 6201 times
Last edited by jackssmirkingrevenge on Fri Nov 06, 2009 11:18 pm, edited 3 times in total.
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: sniper hero » Fri Apr 03, 2009 10:41 am

wow
post a pic of the gun !
and tell something about pressure and range
this is really amazing :D
  • 0

proud member of dutch spud clan
coming: semi auto pellet sniper:D
User avatar
sniper hero
Captain
Captain
 
Posts: 332
Joined: Fri Mar 07, 2008 3:12 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 10:48 am

sniper hero wrote:post a pic of the gun !


Nothing to see really, it's the valve I made attached to a barrel and tee magazine

and tell something about pressure and range


pressure is about 7 bar, range for now is accross my garage floor :)
  • 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: Brian the brain » Fri Apr 03, 2009 11:16 am

This looks to be what you were after all this time..
Congratulations!!!!



So I was pretty close with the Snapvalve huh....


I'll give it another go soon..
  • 0

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!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 11:28 am

Brian the brain wrote:This looks to be what you were after all this time.


Indeed, you should see the size of my grin at the moment :D


So I was pretty close with the Snapvalve huh....



Always - I think there are two key design elements to keep in mind for a reliable design:

1) The piston seat must be significantly bigger than the outlet to the barrel, to ensure that the piston chamber fills with pressure faster than it can empty and the piston has time to actually pop

2) The piston must be significantly wider than the piston seat, in order for there to be enough area for the pressure to act on and overcome the spring strength.

Remember this is at only 7 bar, imagine what you could do with 30!

I'm asking the Easter bunny for a fridge compressor!
  • 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: ALIHISGREAT » Fri Apr 03, 2009 11:28 am

its got a fair bit of power for 100psi, how long is the barrel?
  • 0

<a href="http://www.bungie.net/stats/halo3/default.aspx?player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
Image
User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 11:35 am

ALIHISGREAT wrote:its got a fair bit of power for 100psi, how long is the barrel?


About 36 inches. This by the way was with the barrel held against the valve, and the magazine blocked with my finger leaking air all over the place, so once everything's sealed up the power potential is higher :)
  • 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

Sponsored

Sponsor
 


Unread postAuthor: ALIHISGREAT » Fri Apr 03, 2009 11:46 am

jackssmirkingrevenge wrote:
ALIHISGREAT wrote:its got a fair bit of power for 100psi, how long is the barrel?


About 36 inches. This by the way was with the barrel held against the valve, and the magazine blocked with my finger leaking air all over the place, so once everything's sealed up the power potential is higher :)


ahh so its relatively long, that explains it!
  • 0

<a href="http://www.bungie.net/stats/halo3/default.aspx?player=ALI H IS GREAT"><img src="http://www.bungie.net/card/halo3/ALI H IS GREAT.ashx"></a>
Image
User avatar
ALIHISGREAT
Major General
Major General
 
Posts: 1779
Joined: Sat Aug 25, 2007 6:47 pm
Location: UK
Reputation: 0

Unread postAuthor: SPG » Fri Apr 03, 2009 12:18 pm

FINALLY !!!!!

What range is this shot at ?
  • 0

<A HREF="http://www.paisleypeking.co.uk"><IMG BORDER="0" WIDTH="400" HEIGHT="64" SRC="http://www.paisleypeking.co.uk/images/signature.gif"></A>
User avatar
SPG
Major
Major
 
Posts: 364
Joined: Thu Feb 09, 2006 11:55 am
Reputation: 0

Unread postAuthor: dewey-1 » Fri Apr 03, 2009 12:24 pm

jackssmirkingrevenge wrote:
Brian the brain wrote:This looks to be what you were after all this time.


Indeed, you should see the size of my grin at the moment :D


I bet it is a real shite eating grin too!

Does this mean you will be changing your avatar soon?

Congrats on your longtime endeavor to success!
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 12:32 pm

SPG wrote:FINALLY !!!!!

What range is this shot at ?


A couple of metres :)

As to the blowback bolt, I don't think I'm going to try it with this one to be honest, at 100 psi the power is marginal and I think it would lose too much energy cycling.

The next step I'm considering is buying one of these and hooking it up to a properly made pop-off valve. I've made some friends in the stainless steel welding business through work, I reckon if I got some *shock horror* standard parts together I could have one made at a reasonable price - then there would be power to spare and the world would be my proverbial oyster :)

dewey-1 wrote:Congrats on your longtime endeavor to success!


Thanks, it means a lot :)
  • 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: mark.f » Fri Apr 03, 2009 1:05 pm

Congratulations. Maybe you could stop clogging up the pneumatic cannon discussions already. kidding

Looks like a pretty effective feed. No double/triples/streams of ammo per shot. Looks like friction can be a good feeding aid...
  • 0

User avatar
mark.f
Donating Member
Donating Member
 
Posts: 3464
Joined: Sat May 06, 2006 11:18 am
Country: United States (us)
Reputation: 21

Unread postAuthor: jackssmirkingrevenge » Fri Apr 03, 2009 1:21 pm

mark.f wrote:Maybe you could stop clogging up the pneumatic cannon discussions already. kidding


I know, I know, I have made a bit of a fuss of this personal crusade... but see! there ARE viable alternatives to 1,304,874 round per second cloud BBMGs ;)
  • 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: Carlman » Fri Apr 03, 2009 1:32 pm

Good work mate! I'm glad ypu got er working, now kick it in the gut and lets see what she can really do!
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: POLAND_SPUD » Fri Apr 03, 2009 2:09 pm

so.. that's it ?? I was expecting something more impressive...

just kidding... :wink:
congrats :D
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Next

Return to BB/Airsoft/Pellet Gun Database

Who is online

Registered users: Bing [Bot], Google [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'