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 38 users online :: 4 registered, 0 hidden and 34 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

ergo Piston gun

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

ergo Piston gun

Unread postAuthor: Cosmic Muffin » Sat May 30, 2009 10:52 pm

Gday all.

this is my piston rifle, made entirely from brass and galvanized steel fittings (minus the PVC elbow, getting rid of that). i think i have finally mastered the piston valve, this time i dint have to try 1000 designs to get it working
:lol: piston is just half an AA battery with some bike tyre inner tube rubber epoxied on.
i wanted the chamber small so i could pump it up with a normal bike pump, which ill put bellow the barrel, or somehow in that PVC on top. the barrel is way too short, so i haven't bothered with damage pics until i get at least 1m of copper for the barrel. needs some sights and other random bits and pieces, just wanted to let you guys know what Ive been doing recently. its gonna get a paint job soon too, and a new fill valve, to replace that ugly epoxy fillet elbow.

<a href="http://tinypic.com" target="_blank"><img src="http://i44.tinypic.com/9vcmz5.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

<a href="http://tinypic.com" target="_blank"><img src="http://i40.tinypic.com/hwifwk.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

<a href="http://tinypic.com" target="_blank"><img src="http://i42.tinypic.com/2hxrep0.jpg" border="0" alt="Image and video hosting by TinyPic"></a>
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: Technician1002 » Sat May 30, 2009 10:55 pm

I like the layout. The trigger location and stock rock.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: mark.f » Sat May 30, 2009 11:07 pm

...Ergo, piston gun.

Sorry, couldn't help playing with grammar. :roll:

Very nice gun, too.
  • 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: Cosmic Muffin » Sat May 30, 2009 11:14 pm

oh im sorry :P
cheers guys, just waiting for some paint
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun May 31, 2009 12:16 am

Nice, the stock is evocative of the SL8, I'm sure it was of some inspiration ;)

Image
  • 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: Cosmic Muffin » Sun May 31, 2009 12:41 am

haha thats exactly right Jack.
i loved the look of that gun. i cut the stock ages ago but never found a use for it. but im very satisfied with this build. just made a nice iron sight for it so ill put some pics up of that soon.
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: far_cry » Sun May 31, 2009 8:31 am

hey nice looking gun mate
and the piston is a half AA battery , then the seat is very small this will chock the air .bad flow
  • 0

ImageImage
User avatar
far_cry
Donating Member
Donating Member
 
Posts: 317
Joined: Wed Aug 20, 2008 3:59 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Cosmic Muffin » Tue Jun 02, 2009 2:39 am

the seat what?.. can you explain that a bit more. cheers
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: spot » Tue Jun 02, 2009 11:42 am

The seat of a piston is the surface of the sealing face of the piston that is covered by the barrel (in a barrel sealing piston valve).
  • 0


spot
Private First Class
Private First Class
 
Posts: 27
Joined: Wed Feb 14, 2007 6:52 am
Reputation: 0

Unread postAuthor: jmadden91 » Tue Jun 02, 2009 8:40 pm

@spot
He wasnt asking what a seat is.

@Cosmic Muffin
far cry was saying that if your piston is only the diameter of a AA battery the seat must also not have a very large diameter which could restrict the air flow
  • 0

User avatar
jmadden91
2nd Lieutenant
2nd Lieutenant
 
Posts: 246
Joined: Thu May 07, 2009 6:03 pm
Location: Queensland, Australia
Reputation: 0

Unread postAuthor: Cosmic Muffin » Wed Jun 03, 2009 1:44 am

well the seat is 10mm then.
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Unread postAuthor: rikukiakuchiki777 » Wed Jun 03, 2009 2:14 am

Are you filling from the chamber? how does that work, wouldn't the flow of air push the piston back before pilot area is pressurized?

*sigh*.. I hate trying to figure out how peoples pneumatics work.
  • 0

User avatar
rikukiakuchiki777
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Wed Feb 11, 2009 1:00 am
Location: Australia
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Jun 03, 2009 2:28 am

rikukiakuchiki777 wrote:Are you filling from the chamber? How does that work, wouldn't the flow of air push the piston back before pilot area is pressurised.


If you fill slowy and your piston has a spring behind it then this is entirely possible. Don't forget that almost all sprinkler valve pneumatics are filled from the chamber, not pilot area.
  • 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: rikukiakuchiki777 » Wed Jun 03, 2009 3:39 am

jackssmirkingrevenge wrote:
If you fill slowy and your piston has a spring behind it then this is entirely possible.


Once again, thank you JSR. Would 100psi be too fast to work?
  • 0

User avatar
rikukiakuchiki777
Staff Sergeant
Staff Sergeant
 
Posts: 110
Joined: Wed Feb 11, 2009 1:00 am
Location: Australia
Reputation: 0

Unread postAuthor: Cosmic Muffin » Wed Jun 03, 2009 3:53 am

i dont see how that would cause it not to work riku.
i just hold the gun barrel down while filling, so the piston seals off the barrel. once its passed 5psi it doesnt move.
ill put a spring in there....eventually
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Next

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Yahoo [Bot]

Reputation System ©'