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 72 users online :: 5 registered, 0 hidden and 67 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

loading and installing O-ring for coax

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

loading and installing O-ring for coax

Unread postAuthor: shiny455 » Mon May 09, 2011 4:16 am

I'm currently building a gun with a coax piston valve to shoot .3 calibre ball bearings the last thing i think i am having trouble with is finding a way to load the ball bearings into the barrel. i would like to be able to put it in behind a o-ring or bead of silicone to help performance and so the ball bearing won't fall out if i tilt the gun down. i was thinking a slot in the barrel and a sliding cover close to the chamber but this would give dead space and i don't know how well the sliding cover will work.. any ideas or is this the only way
  • 0

User avatar
shiny455
Specialist
Specialist
 
Posts: 58
Joined: Sat Apr 09, 2011 5:08 am
Reputation: 0

Unread postAuthor: Technician1002 » Mon May 09, 2011 4:21 am

If the bearings are steel, a small magnet works wonders.
  • 0

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

Unread postAuthor: shiny455 » Mon May 09, 2011 5:25 am

yeah they are steel just tested the magnetic definitely attracts them thanks for the idea ill epoxy a couple of magnets to one end of the barrel
  • 0

User avatar
shiny455
Specialist
Specialist
 
Posts: 58
Joined: Sat Apr 09, 2011 5:08 am
Reputation: 0

Unread postAuthor: POLAND_SPUD » Tue May 10, 2011 8:03 am

well you might as well use the oring as the valve (it's called a detent)

JSR will agree with this :-)
  • 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: jackssmirkingrevenge » Tue May 10, 2011 8:37 am

JSR agrees, of 0.3" ball bearings, with a good enough detent (o-ring sandwiched between threaded fittings) you can get amazing performance using just a blowgun as a main valve, as well as the potential for semi or full auto fire.
  • 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: shiny455 » Wed May 11, 2011 6:06 am

it's called a detent
thanks for that i wasn't quite sure if 'detent' refered to the o-ring design i thought it was just for a dent in the barrel.
well you might as well use the oring as the valve

you can get amazing performance using just a blowgun as a main valve

i've already got most the stuff for a piston valve. but maybe for my next gun i kinda want a semi auto bb gun type of thing. would you be able to post a picture or link to the o-ring sandwiched between threaded fittings and are they adjustable. i know the detent would increase the performance by a lot but would there be a way of figuring out how much. i first thought that the coefficient of friction in GGDT would be it but i realised that it is the coeffiecent of friction for the whole barrel.
  • 0

User avatar
shiny455
Specialist
Specialist
 
Posts: 58
Joined: Sat Apr 09, 2011 5:08 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed May 11, 2011 7:03 am

shiny455 wrote:i know the detent would increase the performance by a lot but would there be a way of figuring out how much. i first thought that the coefficient of friction in GGDT would be it but i realised that it is the coeffiecent of friction for the whole barrel.


If the detent pops at your operating pressure, use a generic valve with zero opening time ;)
  • 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
 


Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'