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 33 users online :: 4 registered, 0 hidden and 29 guests


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

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

My slightly ergonomic Co-axial piston cannon!

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 
  • Author
    Message

My slightly ergonomic Co-axial piston cannon!

Unread postAuthor: Kash munni » Sat Sep 13, 2008 12:30 pm

This is my newest cannon. It's not the cleanest thing in the world, but I only had to buy 2 fittings for it, everything else i had laying around somewhere.

Main Body:
The main body is 1 1/4" Sch. 40 PVC. The Barrel is 1/2" sch. 40. I used a sch. 40 reducer with a bit of the middle sanded out to hold the barrel. The piston is a cap from this old medicine i used to need. It's arranged to where it encloses the barrel. As in the piston is backwards so to speak. I used a soft, closed cell foam tape on the back of the piston as a bumper.

The piston
The sealing face is on the barrel in this design. I found a flat rubber washer, used for like hose valves and stuff, that fit perfectly on the breech of the barrel. So it's glued onto the barrel. The piston is fully serviceable; all you need to do is unscrew 2 screws and pull off the reducer in the back.

Pilot/fill setup:
The fill valve is just a simple, 3/8th's NPT schrader valve threaded into the PVC where there are 2 layers, on the coupling. I use an air compressor or a bike pump to fill it. The pilot valve setup is a 1 1/4" to 3/4" threaded reducer, a 3/4" threaded nipple, and a 3/4" ball valve attached to it. The valve is really nice. It opens easily, even with just one finger. I added a 90 degree elbow and a bit of pipe to the back to direct the pilot air downward, and act as a pistol grip. So yay for ergonomics.

Image
Image
Image

I usually fill it to around 60 psi. It shoots nerf darts like a nerf gun from hell. I couldn't even see the dart that i fired at a distance until it dropped about 200 feet away.

When I find some marbles that fit, or get around to making ice slugs, i will post damage pics and videos. But for now, enjoy!
  • 0


Kash munni
Specialist
Specialist
 
Posts: 43
Joined: Sun Mar 23, 2008 7:46 pm
Reputation: 0

Unread postAuthor: hi » Sat Sep 13, 2008 2:52 pm

not to bad. i would use a sprinkler valve as the exhaust though, then it would be easier to shoot comfortably.
  • 0

"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: psycix » Sun Sep 14, 2008 3:08 pm

Nice build.

To add on the pilot valve discussion, instead of using a sprinkler, use a QEV!

Oh, and watch out with those ice slugs, when pvc gets cold it becomes brittle.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: Kash munni » Mon Sep 15, 2008 3:11 pm

Got it. Thanks guys!

Sorry it's taking so long on the damage... I need to find a good, hard hitting ammo.
  • 0


Kash munni
Specialist
Specialist
 
Posts: 43
Joined: Sun Mar 23, 2008 7:46 pm
Reputation: 0

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'