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 65 users online :: 5 registered, 0 hidden and 60 guests


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

Registered users: Bing [Bot], Exabot [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

Coaxial Piston cannon [VIDEO]

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

Unread postAuthor: Brian the brain » Tue Nov 24, 2009 4:17 pm

Oh...you might wanna rethink the title as this is a T-valved cannon..not a coax.

Coaxial means the chamber and barrel share the centerpoint.
The barrel is completely inside of the chamber.

Please don;t ever get used to this cannon..in the way that you feel safe because it has handled a certain pressure before.

It's gonna go one day or another...
i decided to build a cannon that would shoot ice/sand/ etc...


PVC gets brittle when cold.
I have personally held a cannon with ice ammo at the time it blew.
It cut my finger to the bone ( pretty much) and bruised my thigh severely.
Turned green/yellow and purple in a day or two...Before it was just black.

This was with a pressure rated cannon ( 250 psi working pressure!!) and no constructive mistakes to speak of..

DON'T EVER SHOOT ICE OUT OF A PVC CANNON!
I mean it.

All was fine until my brother pulled the pilot BV...
A very big and heavy 4" block nearly hit his head.This was the piston housing...and part of the Tee.

Only the barrel was cold, but once it blew it tore the valve apart, wich was about an inch thick of pvc where the pipe met the fitting.
It came apart like porcelin.

Excuse the all capitals..I truely believe this has the potential to mame or kill someone...
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: Joelduf » Tue Nov 24, 2009 5:28 pm

Do you think it would be possible or even helpful to wrap the pvc joints in fiberglass sheeting (with adhesive etc....) to make it stronger?
  • 0


Joelduf
Private
Private
 
Posts: 10
Joined: Sat Nov 21, 2009 11:21 pm
Reputation: 0

Unread postAuthor: MrCrowley » Tue Nov 24, 2009 5:39 pm

Joelduf wrote:Do you think it would be possible or even helpful to wrap the pvc joints in fiberglass sheeting (with adhesive etc....) to make it stronger?

Not worth the hassle or cost in my opinion. Much safer just building it right.
  • 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: jackssmirkingrevenge » Tue Nov 24, 2009 5:40 pm

Joelduf wrote:Do you think it would be possible or even helpful to wrap the pvc joints in fiberglass sheeting (with adhesive etc....) to make it stronger?


It's possible but infinitely more practical to just make the whole thing out of suitably rated parts.
  • 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: Joelduf » Tue Nov 24, 2009 5:42 pm

It would cost about 20$, it seems. Much better than a new cannon. I am also a VERY patient person, and hey, I'll learn how to wrap things in fiberglass while I'm at it, right?
  • 0


Joelduf
Private
Private
 
Posts: 10
Joined: Sat Nov 21, 2009 11:21 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Nov 24, 2009 5:45 pm

Well I suppose if you wrap it in enough layers...
  • 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: psycix » Wed Nov 25, 2009 5:16 am

It wont end up pretty and compact.
It would be much cleaner and safer to build a cannon out of rated parts.

If you are really patient, just save up some money and do it the right way.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: Joelduf » Tue Dec 01, 2009 7:35 pm

More news: I have fiber-glassed the DWV thickly which no doubt has strengthened it. Also, this will prevent the cannon from shattering, instead producing a tearing action. Finally, i have set my limit at 70psi, which is very much satisfying enough for my tastes, seeing as it can launch QUITE heavy projectiles even at 20psi with great speed.
Problem Solved.

Example: It shot a baseball through 2 sheets of 1" particle board at 20psi.
:)
  • 0


Joelduf
Private
Private
 
Posts: 10
Joined: Sat Nov 21, 2009 11:21 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 02, 2009 12:04 am

Joelduf wrote:It shot a baseball through 2 sheets of 1" particle board at 20psi.


You can't say things like that without showing us a video ;)
  • 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: Joelduf » Wed Dec 02, 2009 2:38 pm

Too bad i ran out of particle board to shoot, as far as i know. :wink:
  • 0


Joelduf
Private
Private
 
Posts: 10
Joined: Sat Nov 21, 2009 11:21 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Wed Dec 02, 2009 2:47 pm

Joelduf wrote:Too bad i ran out of particle board to shoot, as far as i know. :wink:


That's the problem with a new launcher, things around the house previously considered "I'll need this some day, better store it" become "what the heck, I was going to throw it out anyway"

:D :D :D
  • 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

Previous

Return to Pneumatic Cannon Database

Who is online

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

Reputation System ©'