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 78 users online :: 5 registered, 0 hidden and 73 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Jammed Piston! PLease help!

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

Jammed Piston! PLease help!

Unread postAuthor: Panzerfaust » Sat May 26, 2007 4:08 pm

I just completed a piston-in-tee gun and was amazed with its performance. the piston is a 1 1/4 endcap with rubber washer wrapped in duct tape inside 2" pipe. it worked beautifully but has now jammed in place up against the sealing face. no matter how hard i push or pull or pressurize the gun the piston will not move 1 millimeter. i think the duct tape it is wraped in might have caused it to bind up. The only idea i have thought of is to somehow dissolve the duct tape. Acetone dissolves plastics, it would probably dissolve the duct tape but i also destroy my gun. ANY IDEAS OR HELP WOULD BE APPRECIATED. IF I CANT MOVE THIS PISTON I WILL HAVE TO RE-MAKE THE ENTIRE VALVE.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Unread postAuthor: mopherman » Sat May 26, 2007 4:21 pm

fire an arrow down the barrel if you have a bow. put a broom down barrel and hammer it. dump boiling water down barrel. melt piston with blowtorch.
thats all i can think of
  • 0

User avatar
mopherman
Brigadier General
Brigadier General
 
Posts: 788
Joined: Sat Feb 03, 2007 8:20 pm
Reputation: 0

Unread postAuthor: Velocity » Sat May 26, 2007 4:39 pm

Hopefully you made a place to access the piston, through threaded fittings or something else? If not, you might be in trouble...

The best way to get it out is with a broomstick. Just jam it onto the piston until it comes loose.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: Pete Zaria » Sat May 26, 2007 4:40 pm

I'd insert a pole (broom handle, etc...) into the barrel or in the exhaust port of the valve (against the sealing face) and tap it with a hammer (gently) until the piston moves.

Lubricate your piston better in the future :)

Peace,
Pete Zaria.
  • 0

User avatar
Pete Zaria
Moderator
Moderator
 
Posts: 978
Joined: Fri Mar 31, 2006 6:04 pm
Location: Near Seattle, WA
Reputation: 0

Unread postAuthor: Panzerfaust » Sat May 26, 2007 5:08 pm

i can get to the piston both from infront through the air out hole and by unscrewing the back where the fill/fire valves are. i have tried shoving it out with broomsticks but it is SO JAMMED that i cant even move it with that. i think my only hope is to disolve the duct tape somehow. I really cant figure what could possibly jam it up with such extreme holding force... i really think its the duct tape. i had debated removing because it made the piston not move easily, but i thought the tight fit would help it actuate.

actually, its so jammed that even after being assulated with a broomstick the piston IS STILL SO PUSHED AGAINST ITS SEALING SURFACE THAT IT IS ALMOST AIRTIGHT. i just cant think what could be jamming it so horribly.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Unread postAuthor: MrCrowley » Sat May 26, 2007 5:22 pm

rmich732 wrote:Hopefully you made a place to access the piston, through threaded fittings or something else? If not, you might be in trouble...

The best way to get it out is with a broomstick. Just jam it onto the piston until it comes loose.


How do you make the piston accessable through threaded fittings? All the ones i've found for the corresponding pipe are to small to let my piston through. E.g on my new 2" valve I've tried to use 2" threaded sockets but they are to small to let a 2" piston through.

I have a 2" male and female version of these:
Image
  • 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: Panzerfaust » Sat May 26, 2007 5:56 pm

the piston fits through the female fitting, not the male one. i can reach the piston to some degree front and back it just wont move.
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jrrdw » Sat May 26, 2007 7:26 pm

Dump boiling water in the pilot chamber to loosen the tape glue, then the broom down the barrel, keep doing this untill you get it moving, once moving take it all the way out before it resticks. Thats what i would try, mite work.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: Panzerfaust » Sat May 26, 2007 8:10 pm

wouldent boiling water also damage the chamber? pvc becomes soft in boiling water. is there no solvent or something that would disolve the duct tap grip but not harm pvc?
  • 0

User avatar
Panzerfaust
Staff Sergeant
Staff Sergeant
 
Posts: 129
Joined: Tue Apr 17, 2007 4:37 pm
Reputation: 0

Unread postAuthor: jrrdw » Sat May 26, 2007 8:25 pm

Use a hair dryer to heat the outside of the tee, that will soften the glue enough maby.
WD-40 mite work, i keep my piston lubed with it, aint hurt it yet. Windex???
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'