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 71 users online :: 3 registered, 0 hidden and 68 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

leak and glue problem

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

leak and glue problem

Unread postAuthor: fir3dp » Sat Jun 05, 2010 12:03 am

hello!

my first post!

this is my second gun and i have bought everything. using co2!
i have a problem with my piston. its alu and i have having problem gluing rubber to the front to seal it.im using some superglue which kinna sucks. is epoxy strong enough? im using silicon anyways. any idea for anything better?

anyone here from singapore btw? haha



thanks :D
  • 0


fir3dp
Private
Private
 
Posts: 11
Joined: Thu Jun 03, 2010 2:41 am
Reputation: 0

Unread postAuthor: Crna Legija » Sat Jun 05, 2010 2:03 am

epoxy dosent bond with rubber very well, use a screw
  • 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: qwerty » Sat Jun 05, 2010 2:03 am

Your best bet is drilling a hole in the alluminuim piston then screw the face onto it.

Beaten to it by like 5 seconds :roll:
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Unread postAuthor: jrrdw » Sat Jun 05, 2010 6:19 am

You should use a washer and bolt set up to hold the sealing face to the piston. The washer should be all most the inside diameter of your barrel so the seal don't tear off and get blown out the barrel. Be sure and use a sealer on the bolt so air wont get past it and leak out the barrel.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6540
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: fir3dp » Sat Jun 05, 2010 9:37 am

but the diameter of the hole which the piston covers is only about 4mm. isit ok to use a whole rubber piston. like an eraser?
  • 0


fir3dp
Private
Private
 
Posts: 11
Joined: Thu Jun 03, 2010 2:41 am
Reputation: 0

Unread postAuthor: qwerty » Sun Jun 06, 2010 2:34 am

Maybe but at higher pressures they often deform and stop air flow to the chamber complety.
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Jun 06, 2010 3:28 am

fir3dp wrote:but the diameter of the hole which the piston covers is only about 4mm. isit ok to use a whole rubber piston. like an eraser?


I've done it several times with for example the pengun v2 and 0.22 mini.

Image

Image

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

Sponsored

Sponsor
 


Unread postAuthor: Crna Legija » Sun Jun 06, 2010 7:52 am

what pressure are you planing to run it at because i don't think that a eraser would be strong enough. i used a rubber door stopper on my small colax it was quite hard and still got cut at 350 psi.
  • 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: fir3dp » Sun Jun 06, 2010 10:42 am

maybe about 200 psi? im not sure what kinna rubber i should use and cant seem to find any.. any ideas where to cut rubber from? door stopper etc?
  • 0


fir3dp
Private
Private
 
Posts: 11
Joined: Thu Jun 03, 2010 2:41 am
Reputation: 0

Unread postAuthor: Technician1002 » Sun Jun 06, 2010 11:17 am

In some applications it works to put the piston seal in the valve seat. This permits a lighter piston.

With proper retention, this might hold up to CO2 pressures. Insetead of an O ring, a piece of rubber hose could be secured in this fashion to make a seat that won't blow out at pressure.
Image
  • 0

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

Unread postAuthor: clemsonguy1125 » Sun Jun 06, 2010 12:22 pm

Try using a small rubber stopper
  • 0

That is all.
User avatar
clemsonguy1125
Major General
Major General
 
Posts: 1485
Joined: Tue Jul 21, 2009 4:00 pm
Location: East Coast
Reputation: 1

Unread postAuthor: kydavies » Sun Jun 06, 2010 2:15 pm

im using a cork with a piece of an old exersize ball on the end as my piston (havent tried it yet but it should work). also you can get a small piece of you pipe and grease it up then fill it up with hot glue. let it dry and hammer it out. you should have a perfect piston if you greased the pipe enough.
  • 0

mikemurph wrote:yea, the ammo has been changed to a more aero dynamic projectile. it consists of the back half of a dart, and a hot glue ball
AHahahahah!!
User avatar
kydavies
1st Lieutenant
1st Lieutenant
 
Posts: 258
Joined: Thu Apr 22, 2010 9:09 pm
Location: Comox BC
Reputation: 0

Unread postAuthor: Technician1002 » Sun Jun 06, 2010 6:58 pm

Hot glue shrinks as it cools. It should not take too much pounding to get it out if the walls are smooth.
  • 0

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

Unread postAuthor: fir3dp » Tue Jun 08, 2010 11:29 am

ok thanks for your replies.thinking of making a bigger barrel so i can use washers for the pistons. prob save the small one for some other time
  • 0


fir3dp
Private
Private
 
Posts: 11
Joined: Thu Jun 03, 2010 2:41 am
Reputation: 0

Return to Construction Materials/Ammo Discussion

Who is online

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

Reputation System ©'