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 79 users online :: 4 registered, 0 hidden and 75 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Small Coax Pilot Problem

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

Unread postAuthor: tony48 » Mon May 23, 2011 8:23 am

Thank you very much for the info. I think I will be able to find o-rings at a local hardware store. If I do use an o-ring on the piston then I will be worried that there wil be too much friction and the force required to push re piston back won't be created by the small difference in piston and barrel size. That is my only concern and i think it will be alright especially if I use a check valve of some sort.
  • 0

If life gives you lemons, put them in your cannon and shoot them back at life!
User avatar
tony48
Sergeant
Sergeant
 
Posts: 80
Joined: Sun Apr 06, 2008 6:46 pm
Reputation: 0

Unread postAuthor: Technician1002 » Mon May 23, 2011 9:56 am

Getting the valve closed is one of the reasons I improved a piston valve. It is a little harder to build.
  • 0

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

Unread postAuthor: tony48 » Fri May 27, 2011 5:13 pm

For anyone interested, I painted the piston to reduce blowby and got it to fire with the blowgun trigger although it is finicky. Here are some picture of the gun and trigger. The air hose it attached to the pilot area via a 1/8" by 1/4" barbed fitting. The hole was drilled and tapped and airtight. It will be posted eventually in the showcase when I get some damage pictures and get it to trigger more reliably. It's pretty comfy to fire. The rear fill valve acts as a stock and I hold it like a normal rifle with my right hand on the trigger and left on the chamber.

Grip assembly:
Image

Image

Image

Image
Image
  • 0

If life gives you lemons, put them in your cannon and shoot them back at life!
User avatar
tony48
Sergeant
Sergeant
 
Posts: 80
Joined: Sun Apr 06, 2008 6:46 pm
Reputation: 0

Unread postAuthor: the unit » Fri May 27, 2011 8:03 pm

Your pilot volume is probably hurting performance as well. Why not place the blowgun where the ballvalve is and use a trigger linkage, and then put the ballvalve where the hosebarb is.
  • 0


the unit
Specialist
Specialist
 
Posts: 51
Joined: Tue Jun 24, 2008 8:20 pm
Reputation: 0

Unread postAuthor: saefroch » Fri May 27, 2011 8:15 pm

Agree with the above. Pilot volume is pretty large...
  • 0

User avatar
saefroch
Major General
Major General
 
Posts: 1679
Joined: Mon Jun 08, 2009 8:47 am
Location: U.S.A.- See Map
Country: United States (us)
Reputation: 0

Unread postAuthor: tony48 » Fri May 27, 2011 8:31 pm

the unit wrote:Your pilot volume is probably hurting performance as well. Why not place the blowgun where the ballvalve is and use a trigger linkage, and then put the ballvalve where the hosebarb is.


I know the pilot volume is huge but I wanted it to be triggered from a blowgun from the place it is currently located.

What is a trigger linkage?
  • 0

If life gives you lemons, put them in your cannon and shoot them back at life!
User avatar
tony48
Sergeant
Sergeant
 
Posts: 80
Joined: Sun Apr 06, 2008 6:46 pm
Reputation: 0

Previous

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'