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 67 users online :: 3 registered, 0 hidden and 64 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Cannon blew up, rebuild time.

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

Cannon blew up, rebuild time.

Unread postAuthor: ShowNoMercy » Sun Aug 24, 2008 12:47 pm

So I dragged my air cannon out of my room today, charged it to 50 and BOOM blew out at the coupling. Shot like 3 feet of 4 inch pipe down the driveway and my supah valve into my leg. Anyway, I need to rebuild it now. So should I just make the same huge tank and keep it low pressure or shrink the chamber and operate at 100psi? The only constant here is the valve, other than that I am open to ideas.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: hi » Sun Aug 24, 2008 2:15 pm

I had a similar experience, only my whole valve exploded. it made me not use pvc in a piston valve anymore.

I did build a smaller one that worked great, i shot it hundreds of time, then lost interest and it sat in the garage for about 2 months. then i dragged it out again. i started to fill it, but the plug in the pilot section was leaking so i tightened it with a pipe wrench and the tee cracked. im glad it cracked then and not when i shot it.

I'm a firm believer that isnt very safe to use with a piston valve. it works fine for a while, but a year or two down the road it seems to always fail. i now tend to only use metal pipe, except for on combustions. i have no problem using pvc, but i've learned to only use it on small guns. it seems to very slowly get weaker and weaker.

plus lets face it, this really isnt what its for, it just happens to be good for building spudguns out of.

i hope your "new" gun works well.
  • 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: ShowNoMercy » Sun Aug 24, 2008 2:38 pm

I was thinking a smaller, somewhere around a foot long of 3 inch PVC, chamber and a longer smaller bore barrel, maybe 1 1/2 inch. And then maybe rig something to have an inboard HPA tank.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: psycix » Sun Aug 24, 2008 5:03 pm

I would like to see some pictures, a properly built gun doesnt blow at 50 psi!
Why did it blow? Unproper glueing? DWV?
  • 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: ShowNoMercy » Sun Aug 24, 2008 9:01 pm

Nope, I am guessing that the 4 inch coupling just had a weak spot in the glue. Lot of surface area to bond and all. But I tried to service my valve and I can't get the piston to come out of the tee. Any ideas?
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sun Aug 24, 2008 9:05 pm

ShowNoMercy wrote:I can't get the piston to come out of the tee. Any ideas?


Bigger hammer ;)

Why not build a burst fire golfball launcher?
  • 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: F.E.A.R._Sniper » Sun Aug 24, 2008 10:47 pm

you mean like the capabilities that the vogt's have gotten so far JSR?

i would love to have some detailed drawings and diagrams of one of those
  • 0


F.E.A.R._Sniper
Sergeant
Sergeant
 
Posts: 87
Joined: Thu Dec 20, 2007 4:43 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sun Aug 24, 2008 11:00 pm

I would be more inclined to scale up this design, a sort of massive BBMG with a chamber just big enough to hold 10 or so golf balls.
  • 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: ShowNoMercy » Sun Aug 24, 2008 11:01 pm

I was thinking something along those lines. Golfball barrel, maybe 4 feet long, smaller chamber and something that I can carry easily. Def not the Vogt pattern though, my HPA is not nearly big enough.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: Mr.Sandman » Mon Aug 25, 2008 7:17 am

is your leg okay? ive had that happen with one of my drop piston launchers. i did not epoxy it right and the ballvalve shot at my leg and broke my shin :? it was so painful!
  • 0

Yeah, it's that important.
User avatar
Mr.Sandman
Donating Member
Donating Member
 
Posts: 762
Joined: Fri Mar 28, 2008 9:10 am
Country: Antarctica (aq)
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Mon Aug 25, 2008 7:45 am

Mr.Sandman wrote:the ballvalve shot at my leg and broke my shin :? it was so painful!


As in, literally broke the bone? :shock:
  • 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: ShowNoMercy » Mon Aug 25, 2008 7:54 am

Well it was only like 50psi and the valve wasn't sealing right so it wasn't a huge amount of pressure. And it takes a lot to accelerate a supah valve, their kinda bulky. Still can't get the damn thing apart, What should I use as a drift? Piece of wood?
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: rna_duelers » Tue Aug 26, 2008 3:31 am

I had a barrel explode on me in cold weather,sent pieces of PVC in every direction some about the size of a mobile phone.I wish I got some pictures of it,could you get some pictures of your blown apart cannon?I want to see how the coupler failed.

Can you pull your supah apart by any chance and get as many photo's as possible of it's inner workings?I know there a a few pictures floating around but a few more can't hurt. :wink: As for getting it out,jacks on the money,bigger hammer and maybe some KY jelly.
  • 0

Image
User avatar
rna_duelers
Major General
Major General
 
Posts: 1740
Joined: Mon Sep 26, 2005 7:07 am
Location: G-land Australia
Country: Australia (au)
Reputation: 1

Unread postAuthor: ShowNoMercy » Tue Aug 26, 2008 4:49 pm

I got it apart, used a 9oz C02 tank as a drift and a rubber mallet. As for pictures, sorry its all back together. And the coupling just shot off in one piece. Most likely a weak spot in the glue.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'