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 43 users online :: 4 registered, 0 hidden and 39 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

Questions on 2.5 inch barrel tennis ball cannon

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: Fnord » Wed May 02, 2012 7:32 pm

Hmm, did the chamber actually say cellular core on it? That's the greatest concern. only those three fittings to replace otherwise.

Not sure of the regulations, but I found a piece of cell core pipe which specifically said 'NOT FOR PRESSURE' on it. Pressure rated pipe also says DWV, but there's a pressure rating near it.


I have not had a reason to upload this for a while, but please note that from now on DWVcat shall be the standard copypasta for advising PVC newbs on cannon construction :)

Image
  • 0

Attachments
DWVcat.jpg
Ironically I think that tee it's in might be pressure rated. The reducing bushing is anyway.
DWVcat.jpg (30.81 KiB) Viewed 836 times
Image
User avatar
Fnord
Major General
Major General
 
Posts: 2244
Joined: Tue Feb 13, 2007 9:20 pm
Location: Pripyat
Reputation: 7

Unread postAuthor: Gun Freak » Wed May 02, 2012 8:31 pm

how can you tell from the pictures, anyway?


They just look different than sch 40 fittings, typically more fancy... but anyway, replace that asap, I wouldn't use it above 50 because my friend had DWV blow up on his pneumatic at 60 psi, and with you doing this with your kids, that would be terrible...

Bottom line, get that replaced.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: MrCrowley » Wed May 02, 2012 9:16 pm

Gun Freak wrote:
how can you tell from the pictures, anyway?
They just look different than sch 40 fittings, typically more fancy
I think he was referring to the pipe, not the fittings :wink:
  • 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 » Wed May 02, 2012 11:50 pm

Fnord wrote:I have not had a reason to upload this for a while, but please note that from now on DWVcat shall be the standard copypasta for advising PVC newbs on cannon construction :)


Wouldn'tthis cat be a better warning :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

Unread postAuthor: Technician1002 » Wed May 02, 2012 11:50 pm

First, the tennis balls sure do fit tight into the 2.5 inch barrel. I was assuming they would slide right in. They really require a firm push to insert. No biggie, though.



The thin wall stuff is a much better fit for tennis balls. It can be hard to find, but it works very well. Loading is as simple as drop it in.
[youtube]http://www.youtube.com/watch?v=s0l5t7D0FDM[/youtube]
  • 0

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

Unread postAuthor: HunterT » Thu May 03, 2012 12:46 am

jackssmirkingrevenge wrote:
Fnord wrote:I have not had a reason to upload this for a while, but please note that from now on DWVcat shall be the standard copypasta for advising PVC newbs on cannon construction :)


Wouldn'tthis cat be a better warning :D
\

This might be slightly more suitable for the Miniboy...
  • 0

User avatar
HunterT
Staff Sergeant
Staff Sergeant
 
Posts: 113
Joined: Wed Jul 07, 2010 9:46 pm
Location: Just east of Russia
Reputation: 0

Unread postAuthor: High-PSI » Fri May 04, 2012 7:16 am

OK, I rebuilt the gun with all pressure rated PVC and a 125 psi pop-off valve. We have put dozens and dozens of shots through this thing. Man, I love this cannon!

I finally had a minor issue with my 2 inch Orbit valve [firing it at 110 psi :wink: ]. The valve uses a separated rubber sealing face from the diaphragm. This sealing face is pressure fit into a plastic mold that holds it in shape. Well, that rubber sealing face popped out of the plastic mold. So, I used some industrial rubber adhesive to glue it back in place. It has set overnight and I will try it out today. If this doesn't work, it would be easy to make a retainer on the CNC out of a 3mm thick piece of carbon fiber panel.

Anyway, I brought my compressor home so we could air it up at the touch of a button. So, we fired, and fired, and fired this thing. It is truely alot of fun using a cannon that can be fired (if very careful) in the public eye without the SWAT team showing up. :D

Now I just need to find some of that thin wall tubing for a better tennis ball fit and I will build a piston coax cannon next........

Matt
  • 0

Exotic E-bike builder, air cannon builder, and overall crack-pot. ;~)

High-PSI
2nd Lieutenant
2nd Lieutenant
 
Posts: 231
Joined: Sat Oct 09, 2010 7:43 pm
Location: Nothern Illinois
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: High-PSI » Sat May 05, 2012 9:26 am

Hey Guys,

I was asked for some performance results.........

My sealing piston repair did the trick. We have been firing and firing and firing this thing. I have well over 100 shots out of it all the way up to 120 psi with great results.

At 50 psi, the hang time [fired straight up] is 15 seconds.
At 120 psi, the hang time is 21 seconds. At 120 psi, the ball is fired nearly out of sight.

I know this valve is not as efficient as a coaxial or a supah valve, but for our purposes, this thing is fantastic!

Anyway, my boys and I are having a blast (pun intended) with this thing.

Oh, lastly, I poures two cups of water down the barrel and fired it. Talk about KICK! It blew a wall of water a good 60 to 70 feet. :D

Matt
  • 0

Last edited by High-PSI on Sat May 05, 2012 9:28 am, edited 1 time in total.
Exotic E-bike builder, air cannon builder, and overall crack-pot. ;~)

High-PSI
2nd Lieutenant
2nd Lieutenant
 
Posts: 231
Joined: Sat Oct 09, 2010 7:43 pm
Location: Nothern Illinois
Reputation: 0

Previous

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'