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 69 users online :: 5 registered, 0 hidden and 64 guests


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

Registered users: Bing [Bot], Exabot [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

OMEGA Project- underway!

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: Velocity » Sat Dec 23, 2006 10:55 am

Yeah, I have had a similar experience involving big cannons. I finally finished my piston-valved Americannon, and it was shooting fine for a while. Suddenly, however, after one shot the washer, screw, and neoprene sealing face had shot off. Luckily I found them, and replaced them. The same thing happened on the next shot. I realized that the bolt for the screw was the wrong size, and now the hole when the screw was supposed to screw into on the piston was stripped.

I tried to drill out the stripped screw hole and put in a larger screw, but I did it at an angle, and ruined it.

I bought new parts for the piston, but I messed up. The two endcaps which made up the piston did not glue together flushly, and I did not want to use it for fear of it "catching" on something.

Yet again I tried, and failed. When I failed on my third try, it was the worst feeling ever. The hardware store was all out of the parts I needed. I was seriously considering just smashing up the valve and quitting spudguns...forever.

I decided to give it one more try (after some inspirational words from my mother :D ). I managed to fix the drilled out hole on the first piston, and it worked fine from there.

While I may have gotten lucky, the point it often you will need to buy new spudgun parts if you keep screwing up on the same thing. You just gotta stick in there.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: schmanman » Sat Dec 23, 2006 12:30 pm

yeah, I felt this way after the tee, pipe leading to the air chamber, and reducers on one of the chambers cracked on the swat gun. I considered giving it up, and I am glad I didn't.
  • 0

Persistence is a measure of faith in yourself
User avatar
schmanman
Major General
Major General
 
Posts: 1685
Joined: Sat Mar 25, 2006 12:28 pm
Location: Michigan,U.S.A
Country: United States (us)
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Sat Dec 23, 2006 2:51 pm

I've been seriously slacking on pics. Here you go:

Image

Image

Image

Image

Image

Image

Image (tee for handle)

Image


notice how nice of a job the holesaw did on the tee. It took down the stop really well in my drill press. Too bad I fudged up the other socket..
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: frankrede » Sat Dec 23, 2006 3:46 pm

I like your modified T's how did you do it?The stoppers took me for ever to sand out.
On mine I used a dremel.
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Sat Dec 23, 2006 4:03 pm

I used a 4 1/2" holesaw.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: schmanman » Sat Dec 23, 2006 9:48 pm

very very VERY nice. :D

keep up the good quality work. nice job on those tees.
  • 0

Persistence is a measure of faith in yourself
User avatar
schmanman
Major General
Major General
 
Posts: 1685
Joined: Sat Mar 25, 2006 12:28 pm
Location: Michigan,U.S.A
Country: United States (us)
Reputation: 0

Unread postAuthor: MisterSteve124 » Sat Dec 23, 2006 10:08 pm

wait so are those the new ones you got or the ones that are messed up?
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: PVC Arsenal 17 » Sat Dec 23, 2006 11:29 pm

those are the messud up ones. Look at the close up of the one socket.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: MisterSteve124 » Sun Dec 24, 2006 11:54 am

well if the hole is too big you could try taking some pvc cement and rubbing it on the socket to try and get it in the grooves and then sand it down if you need it. It could save you from getting new ones
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: killagorrila99 » Thu Dec 28, 2006 12:21 am

When do you think this will be finished? I really like the look of it...
  • 0

"I'm sorry, Mr.Bush cant come to the phone right now, He's playing cleudo with Mr. Cheney And he has him in the Cupboard with a broom stick" -White house receptionist.
User avatar
killagorrila99
Brigadier General
Brigadier General
 
Posts: 1101
Joined: Tue Jul 25, 2006 2:35 am
Location: Australia.
Reputation: 0

Unread postAuthor: sgehring » Thu Dec 28, 2006 12:50 am

So did you use the 4 1/2 hole saw and then take it back like you planned? I like the handle. Thati s simliar to what I did on the Maulernator to make the "bolt' that I load the golf ball through on the breechload. Good job. Glad you didn't give up.
  • 0


sgehring
Corporal
Corporal
 
Posts: 71
Joined: Tue Nov 21, 2006 11:36 pm
Location: Idaho
Reputation: 0

Unread postAuthor: SpudStuff » Thu Dec 28, 2006 12:58 am

You atre going to fill that with a schrader valve? You need WAY more flow then that, especially without an o-ring.
  • 0

User avatar
SpudStuff
Major General
Major General
 
Posts: 1410
Joined: Sat Dec 10, 2005 3:55 pm
Location: Cupertino, California
Reputation: 1

Unread postAuthor: Velocity » Thu Dec 28, 2006 1:28 am

SpudStuff wrote:You atre going to fill that with a schrader valve? You need WAY more flow then that, especially without an o-ring.


Eh... I don't think so. The Americannon (similar to the Omega, only a bit larger chamber) is filled through a 1/8" schrader connected to a 1/8x1/4" bushing connected to a 1/4" check valve connected to a 1/4" female quick disconnect, and this entire assembly is attached to a 1/4" male quick disconnect which is a ttached to the 3/4" QEV that pilots it (whew!)

The 1/8" schrader and 1/4" check valve really slow down flow (I can tell when I am pumping the bike pump), but it still fills fine. My advice: Pump like crazy till it reaches 20 PSI, then it should be sealed fine (perhaps lower; mine seals at around 10 PSI, possibly lower)
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Sun Dec 31, 2006 12:33 pm

I still have an open 1/4" port still on that brass cross. I might put in a ball valve with a quick connect to fill it off the compressor.

And yes, I used the 4 1/2" hole saw. It worked great too, I was surprised. I've decided not to glue the reducing tees around the chamber pipe. It would be a pain in my ass and seeing how tight they are as it is, the shouldn't move around much.
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: PVC Arsenal 17 » Sat Jan 06, 2007 1:48 pm

Rmich... just making sure I didn't forget, you said 1 inch of piston travel right? Will more be better or no?
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

PreviousNext

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'