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 61 users online :: 4 registered, 0 hidden and 57 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

diaghram wont seal

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

diaghram wont seal

Unread postAuthor: jon_89 » Mon Nov 05, 2007 9:07 pm

i just finished my coaxial and the air goes right through the barrel. what is the problem?
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: Novacastrian » Mon Nov 05, 2007 9:09 pm

The barrel is not sealing. What are you using for the sealing face?
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jon_89 » Mon Nov 05, 2007 9:13 pm

it is diaghram valve. i am using sheet rubber
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: mopherman » Mon Nov 05, 2007 9:33 pm

Are you filling from behind the 'phram? how far is your barrel from the 'phram when uncharged?
  • 0

searching for a modern day savior from another place,inclined toward charity,everyone's begging for an answer,without regard to validity,the searching never ends,it goes on and on for eternity
-Bad religion
User avatar
mopherman
Brigadier General
Brigadier General
 
Posts: 788
Joined: Sat Feb 03, 2007 8:20 pm
Reputation: 0

Unread postAuthor: MrCrowley » Mon Nov 05, 2007 10:09 pm

Hmm, PM a member called 'noname', he is somewhat of a diaphragm expert. Though I can't see why it wouldn't work.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: spudgunnerwryyyyy » Mon Nov 05, 2007 10:23 pm

How thick is the rubber, noname should help, umm how much pressure did you apply? Is the barrel perfectly flat.
  • 0

The Doors are awesome, Led Zeppelin is amazing, and Motley Crue kicks @$$.
Go Orange Box

RAP SUCKS
User avatar
spudgunnerwryyyyy
1st Lieutenant
1st Lieutenant
 
Posts: 261
Joined: Thu Jul 12, 2007 10:54 pm
Reputation: 0

Unread postAuthor: MrCrowley » Mon Nov 05, 2007 10:58 pm

What are you pumping the gun with? How big is the chamber? How is the 'phragm held in place? Is it flexible enough? Is it a good sealing material?
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Sponsored

Sponsor
 


Unread postAuthor: jon_89 » Mon Nov 05, 2007 10:59 pm

filling from behind, tried different distances, no pressure cause it leaks through the barrel.
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: knappengineering » Mon Nov 05, 2007 11:09 pm

What are you using to fill it, it sounds like it may not be getting the air it needs to seal quickly enough, or your equalization hole could be too big.
  • 0

Knapp Engineering
www.ewr24.com
User avatar
knappengineering
Sergeant First Class
Sergeant First Class
 
Posts: 137
Joined: Sun Jun 24, 2007 1:01 pm
Reputation: 0

Unread postAuthor: LikimysCrotchus5 » Mon Nov 05, 2007 11:11 pm

What do you fill it with and via? CO2? Schrader? HPA tank? Compressor?

And how abour Pics?
  • 0

Last edited by LikimysCrotchus5 on Mon Nov 05, 2007 11:12 pm, edited 1 time in total.
4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
LikimysCrotchus5
Brigadier General
Brigadier General
 
Posts: 1100
Joined: Tue Sep 04, 2007 10:16 pm
Reputation: 0

Unread postAuthor: spudgunnerwryyyyy » Mon Nov 05, 2007 11:12 pm

You need lots of air flow to get it to seal. like a continuous flow of 25psi from a compressor.
  • 0

The Doors are awesome, Led Zeppelin is amazing, and Motley Crue kicks @$$.
Go Orange Box

RAP SUCKS
User avatar
spudgunnerwryyyyy
1st Lieutenant
1st Lieutenant
 
Posts: 261
Joined: Thu Jul 12, 2007 10:54 pm
Reputation: 0

Unread postAuthor: knappengineering » Mon Nov 05, 2007 11:19 pm

In addition to what spudgunner said, a bike pump probably wouldn't cut it for this gun, you need a compressor or CO2 or something similar. :wink:
  • 0

Knapp Engineering
www.ewr24.com
User avatar
knappengineering
Sergeant First Class
Sergeant First Class
 
Posts: 137
Joined: Sun Jun 24, 2007 1:01 pm
Reputation: 0

Unread postAuthor: spudgunnerwryyyyy » Mon Nov 05, 2007 11:21 pm

spudgunnerwryyyyy wrote:You need lots of air flow to get it to seal. like a continuous flow of 25psi from a compressor.


I already said compressor.

How close is the phram in size to the id of the pipe. Get the gap really small. like under a millimeter
  • 0

The Doors are awesome, Led Zeppelin is amazing, and Motley Crue kicks @$$.
Go Orange Box

RAP SUCKS
User avatar
spudgunnerwryyyyy
1st Lieutenant
1st Lieutenant
 
Posts: 261
Joined: Thu Jul 12, 2007 10:54 pm
Reputation: 0

Unread postAuthor: LikimysCrotchus5 » Mon Nov 05, 2007 11:26 pm

I have that problem with sealing my piston valve because there is not enough flow ever since i added that bumper to my piston. What i do now to seal it is begin to fill via schrader, i have to shut the ball valve between the schrader and the brass tee connected to the back of the tee. I have to shut the ball valve and build up pressure, then release it causing that burst of pressure to seal the piston to the barrel. So it still works which i am happy with for now. :D
  • 0

4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
User avatar
LikimysCrotchus5
Brigadier General
Brigadier General
 
Posts: 1100
Joined: Tue Sep 04, 2007 10:16 pm
Reputation: 0

Unread postAuthor: Tom » Tue Nov 06, 2007 9:06 am

From what kind of rubber is the diaghram made?
  • 0

Really really proud member of the Dutch Spud Clan!

Tom
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Fri Aug 24, 2007 8:22 am
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'