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 45 users online :: 4 registered, 0 hidden and 41 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Question about a mini coaxial piston gun. Plans posted.

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

Question about a mini coaxial piston gun. Plans posted.

Unread postAuthor: Kash munni » Mon Jul 28, 2008 9:50 pm

Ok so I am making a mini coaxial piston gun and I have developed what looks like a plan. It will be totally portable like my other guns, having it's own pump attached. Here's the plan:

http://s288.photobucket.com/albums/ll19 ... rrifle.jpg

The ball valve will serve as the pilot valve.

My questions:
1. Will the needle work ok as a piston stopper at the relatively low pressures of a hand pump? If not then how should I stop the piston?
2. Will a piston valve work around those pressures? I don't really see why it wouldn't, but I would like assurance from you guys.
3. What are some things I can use as a piston for 1/2" SCH 40 pvc that I would probably have around? I will be looking, but if anyone knows any tricks, that would help alot.

Thanks
  • 0


Kash munni
Specialist
Specialist
 
Posts: 43
Joined: Sun Mar 23, 2008 7:46 pm
Reputation: 0

Re: Question about a mini coaxial piston gun. Plans posted.

Unread postAuthor: brogdenlaxmiddie » Mon Jul 28, 2008 10:24 pm

1. Will the needle work ok as a piston stopper at the relatively low pressures of a hand pump? If not then how should I stop the piston?
Use a bumper
2. Will a piston valve work around those pressures? I don't really see why it wouldn't, but I would like assurance from you guys.
It should work fine. Just keep a low pilot vol.
3. What are some things I can use as a piston for 1/2" SCH 40 pvc that I would probably have around? I will be looking, but if anyone knows any tricks, that would help alot.
No idea. Like you said though, just keep looking around.
  • 0


brogdenlaxmiddie
Colonel
Colonel
 
Posts: 562
Joined: Sun Jul 22, 2007 2:19 pm
Country: United States (us)
Reputation: 0

Unread postAuthor: jr » Mon Jul 28, 2008 10:45 pm

I like the design.... I have been considering a mini my self!
  • 0

My armadillo don't like me trousers
User avatar
jr
Master Sergeant
Master Sergeant
 
Posts: 162
Joined: Thu Aug 17, 2006 8:24 pm
Location: brem. wa.
Reputation: 0

Unread postAuthor: Kash munni » Mon Jul 28, 2008 10:56 pm

Thanks brogden. It will be a challenge to keep the pilot volume low while still having a a bumper in front of the needle... but i'm up to it. I hope to finsh it tomorrow after making a run to lowes for parts. :)

Also thanks jr. I love pneumatic guns but I hate having to have an external air source. That's why I always design my guns around a hand pump. Some day I'll make a big artillery style cannon... but for now I like the smallbore stuff. 8)
  • 0


Kash munni
Specialist
Specialist
 
Posts: 43
Joined: Sun Mar 23, 2008 7:46 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Jul 29, 2008 12:24 am

Image

That needle will be bent out of shape by the first shot. For minis, remember - low volume, high pressure - invest in a shock pump.
  • 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: Kash munni » Tue Jul 29, 2008 8:51 am

If I see a decently priced bike pump at wal-mart today then I will look into it. Would there be any schrader valves at wal-mart? If not I think I have one on an old bike tire.

If I take that route, would drilling into the side of the PVC for the schrader make it unstable to use under pressure? I've heard warnings about putting holes into cylindrical pressure chambers before.
  • 0


Kash munni
Specialist
Specialist
 
Posts: 43
Joined: Sun Mar 23, 2008 7:46 pm
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'