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 44 users online :: 3 registered, 0 hidden and 41 guests


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

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

Tips for sealing off pipe?

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

Tips for sealing off pipe?

Unread postAuthor: Gnobbes » Thu Oct 05, 2006 9:40 pm

Howdy Spudfolks

X-Mas is fast approaching, and in order to justify my recent spud gun obsession, I've decide to build a couple of gift guns.

My little cousin is ten years old, and he's way into Lego Bionicles. One of the weapons that these little robot guys carry is called a Zamor Sphere Launcher, which is a crossbow-ish orb shooter. I'm thinking about replicating this as a pneumatic tennisballer.
This is gonna be a low pressure cannon using an unmodified sprinkler valve, with a pop-off safety valve and other safety features. Nothing special performance-wise, but spectacular cosmetically (if it comes together like I'm picturing it.)

To make the crossbow arms, I was thinking of using a cross fitting between the valve and the breech loader/ barrel. Of course I don't want the air flowing into these arms, so I'll have to seal them off. My question is: what's the best way to do this?

In other threads people recommend cutting a piece of sheet pvc to do the job, but I honestly don't want to track down and spend the money on this stuff right now (although it would be handy stuff to have around...)

I was thinking that I could use a rubber super ball of the right size to plug the hole. Maybe epoxy it in there. Do you guys think that that'll suffice? Remember, this is gonna be after the chamber in a low pressure gun.

Any other suggestions?
Thanks in advance.
  • 0

User avatar
Gnobbes
Private
Private
 
Posts: 17
Joined: Tue Aug 22, 2006 3:54 pm
Reputation: 0

Unread postAuthor: Yonderknight » Thu Oct 05, 2006 10:28 pm

I don't have much experience with sealing off parts of a gun, but maybe this can work?

http://www.spudfiles.com/forums/viewtopic.php?t=3834&
  • 0


Yonderknight
Private First Class
Private First Class
 
Posts: 32
Joined: Thu Aug 17, 2006 7:16 pm
Reputation: 0

Unread postAuthor: frankrede » Thu Oct 05, 2006 11:24 pm

Have you ever thought of using an endcap?
  • 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: Gnobbes » Thu Oct 05, 2006 11:47 pm

You guys aren't understanding.
I want to seal off the airflow at the begining on the junction, keeping the flow out of the cosmetic areas. Here's a quick paint sketch:
Image
The blue circle is the rubber superball, and that's the point where I'm wanting to put the stop.
  • 0

Last edited by Gnobbes on Fri Oct 06, 2006 12:03 am, edited 1 time in total.
User avatar
Gnobbes
Private
Private
 
Posts: 17
Joined: Tue Aug 22, 2006 3:54 pm
Reputation: 0

Unread postAuthor: Yonderknight » Fri Oct 06, 2006 12:02 am

Yeah, I got that much =p. I think those test-plugs should work, I mean they're made for sealing off a pipe under pressure. Even though they're for temporary testing, the barrel isn't going to be under that much pressure anyways.
  • 0


Yonderknight
Private First Class
Private First Class
 
Posts: 32
Joined: Thu Aug 17, 2006 7:16 pm
Reputation: 0

Unread postAuthor: frankrede » Fri Oct 06, 2006 12:12 am

Put a quarter or something similiar and epoxy it like crazy.
It would be better to mod the valve.The little tike doesnt need to worry about wires and stuff. Use a 3/4 valve if you want low power.
Maybe you could mod the valve through the solenoid port so the pilot will stay the same size.
  • 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: Gnobbes » Fri Oct 06, 2006 12:13 am

I'm going to the hardware store tomorrow, and I'll definitely check those test-plugs out. I'm having a hard time picturing them, and how they'll work, but it's worth looking at them. I can always glue them in, too.
Thanks.
  • 0

User avatar
Gnobbes
Private
Private
 
Posts: 17
Joined: Tue Aug 22, 2006 3:54 pm
Reputation: 0

Sponsored

Sponsor
 


Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'