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 65 users online :: 4 registered, 0 hidden and 61 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 too has semi-auto

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

Unread postAuthor: jor2daje » Fri May 21, 2010 12:18 am

umm it seems a litttle underkill for a 3/4" the flow through them is alright but the holes look to only be about 1/16".

also update with some videos shooting up acrylic.
  • 0

Patience is a virtue, get it if you can, seldom in a women, never in a man.
User avatar
jor2daje
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California
Reputation: 0

Unread postAuthor: Crna Legija » Fri May 21, 2010 1:34 am

maby with a realy small id do with a 1/4 tho
  • 0

'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

Add me on ps3: wannafuk, 8/11/11 cant wait
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Unread postAuthor: POLAND_SPUD » Fri May 21, 2010 1:58 am

I think that clippard's MJVO-3 valves might have enough flow to pilot a 3/4" QEV... but I can't get them in europe so you might want to ask PVC_arsenal to test it for you

MJVO-3 valves have ~800 l/m of flow while most 1/8" DCVs have about 200 - 300 l/m
  • 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

Unread postAuthor: michaelgohjs » Fri May 21, 2010 6:28 am

emm i m sorry but i dont really get the idea of how this works.. maybe an animated gif or some explaination..i dont understand the ev and 3 way valve part
  • 0


michaelgohjs
Private
Private
 
Posts: 13
Joined: Tue May 18, 2010 1:56 am
Reputation: 0

Unread postAuthor: django » Fri May 21, 2010 7:44 am

Wow man great work,I love this design =I have been thinking of making another semi auto myself and this design looks like a winner! 8) . My current semi is ok but too big so I need to make another thats much smaller than my huge Pitbul 9 rifle,I want to make it as compact as possible for transporting it about seeing as these things are HIGHLY illegal here in Australia. Dont know if I can make this design compact enough for what I have in mind?: like a small P90 design

I might use your design ( if thats ok?)but instead again use one of those great little 1/8 MJVO-3 Poppet Valves as per my current Semi, though those pnuematic cylinders are insanely expensive here!!??. what psi are you running through this beast?

GREAT WORK
  • 0


django
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 410
Joined: Sat Feb 12, 2005 11:33 pm
Location: Australia
Reputation: 0

Unread postAuthor: POLAND_SPUD » Fri May 21, 2010 8:53 am

lol no offence but this design has been first used by PVC_arsenal IIRC... then at least 3 or 4 other people has built something similar
  • 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

Unread postAuthor: Lockednloaded » Fri May 21, 2010 9:36 am

how do you seal the pneumatic cylinder? is it just a tight fit or do you have a floating o-ring seal?
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: django » Fri May 21, 2010 5:44 pm

POLAND_SPUD wrote:lol no offence but this design has been first used by PVC_arsenal IIRC... then at least 3 or 4 other people has built something similar


Well I'm pretty much a lurker here most of the time,thats my excuse anyways :D
  • 0


django
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 410
Joined: Sat Feb 12, 2005 11:33 pm
Location: Australia
Reputation: 0

Unread postAuthor: POLAND_SPUD » Fri May 21, 2010 5:53 pm

lol you might say that I am a bit envy but I am envy...

IIRC I have posted just one gun here (well ok 2 but they are very similar) and it used the same principle as this one... I talk about it all the time, damn I even talk about DCVs all the time, which are closely related to this... and yet ppl are like 'wow that's a great idea dude'
:shock:
[/envy&ranting]

lol I realize it was pathetic...
ok enough hijacking :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

Unread postAuthor: jor2daje » Fri May 21, 2010 8:09 pm

@michael, did yo look at the pictures on the first page, I think they explain it quite easily.

and ya im definetly not the first one to come up with a design like this, I think pvc aresenal and btrettl both use something like this in their nerf guns, and poland spud and others have used this on a larger scale.

@lockednloaded what do you mean seal the cylinder? in the barrel it seals just because it is a really good fit.
  • 0

Patience is a virtue, get it if you can, seldom in a women, never in a man.
User avatar
jor2daje
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California
Reputation: 0

Unread postAuthor: Gun Freak » Fri May 21, 2010 8:16 pm

I think he means behind where it pushes the ammo where it goes into the barrel.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: Lockednloaded » Fri May 21, 2010 8:22 pm

jor2daje wrote: what do you mean seal the cylinder? in the barrel it seals just because it is a really good fit.

Thats exactly what i was asking, thanks. does a lot of air escape out of there? because if you make it air tight you may see an increase in power
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Unread postAuthor: Gun Freak » Fri May 21, 2010 8:24 pm

Try a small o-ring with some lube, I agree with LnL, you may get a small boost.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: jor2daje » Fri May 21, 2010 8:53 pm

it seems really pretty good seal, i may put a little flour behind just to see how much escapes but I dont feel much and my face is pretty close to it when Im shooting :D
  • 0

Patience is a virtue, get it if you can, seldom in a women, never in a man.
User avatar
jor2daje
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 418
Joined: Sun Oct 05, 2008 9:41 pm
Location: Southern California
Reputation: 0

Unread postAuthor: Lockednloaded » Fri May 21, 2010 8:57 pm

I've got a good idea for sealing in my scaled up gun; i will epoxy an o ring in a bushing and the rod will slide in and out of that. any ideas for a good lubrication, I'm thinking graphite
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

PreviousNext

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'