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 54 users online :: 4 registered, 0 hidden and 50 guests


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

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

Multishot Pneumatic

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Multishot Pneumatic

Unread postAuthor: Lentamentalisk » Tue Oct 23, 2007 6:19 pm

I assure you that you have (probably) never seen this design before (unless you have been hanging out on UKSGC.) I dont claim that I invented it, I only saw it on UKSGC, but I dont remember who thought it up.

The general idea is that a QEV only is open when the pressure in the pilot is less than the pressure in the chamber. With this setup, the pilot pressure only lowers by a small percentage, so the same is true with the chamber.

To fire, you make sure that the ball valve is closed, then pull the trigger.
To reset it for firing, simply open the ball valve to let out the air, and close it again

Image

This could work with a home made piston, but I have my doubts, since they generaly are not as sensitive as manufactured QEVs.
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: spudgunnerwryyyyy » Tue Oct 23, 2007 6:23 pm

Thats a great idea, since no air at all is wasted to pilot the valve. Also the qev should reseal with a minimum pressure because there is still gas in the chamber nice idea can't wait to see a cannon using it here.

Oh and a barrel sealing valve with o-rings and a small efficient pilot volume will be pretty close to commercial qev's when it comes to opening times.
  • 0

The Doors are awesome, Led Zeppelin is amazing, and Motley Crue kicks @$$.
Go Orange Box

RAP SUCKS
User avatar
spudgunnerwryyyyy
1st Lieutenant
1st Lieutenant
 
Posts: 261
Joined: Thu Jul 12, 2007 10:54 pm
Reputation: 0

Unread postAuthor: Lentamentalisk » Tue Oct 23, 2007 6:42 pm

I do not understand sprinkler valves at all. Do you think that this same idea would work with them?
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: windshrike » Tue Oct 23, 2007 6:48 pm

Lentamentalisk wrote:I do not understand sprinkler valves at all. Do you think that this same idea would work with them?


NO. I have tried and PLENTY of air will leak past before it seals again. Your best bet with a sprinkler is a ball valve cracked open a small amount so that a very small amount of air can leak past, this will allow the diaphragm to reseat, but takes a few seconds to refill each time.
  • 0

User avatar
windshrike
Sergeant Major
Sergeant Major
 
Posts: 178
Joined: Thu Jun 28, 2007 4:23 pm
Reputation: 0

Unread postAuthor: Lentamentalisk » Tue Oct 23, 2007 7:42 pm

Damn, well ok, I'll just have to make my marble sniper with a QEV from McMasters...
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: clide » Wed Oct 24, 2007 12:39 am

Lentamentalisk wrote:I assure you that you have (probably) never seen this design before (unless you have been hanging out on UKSGC.)


Or unless the guy who posted it on UKSGC also <a href="http://www.spudfiles.com/forums/copperhead-semi-auto-method-t9916.html">posted it here</a> :wink:

I have plans to try this in a piston valve sometime in the future.
  • 0


clide
Donating Member
Donating Member
 
Posts: 785
Joined: Sun Mar 06, 2005 3:06 am
Location: Oklahoma, USA
Reputation: 0

Unread postAuthor: al-xg » Fri Oct 26, 2007 12:23 pm

I've made a cannon using two valves for multishot, not sure i have any pictures of it though. And it works fine, but the obviously the power will go down with each shot...

I then replaced the two valves by a slide valve just like Hotwired's design.
The last multishot design used the slide valve the other way around, like Clide's Paintball semi and ran it off a 2L steel backpack tank with a regulator.

I think i have some pictures of the last one...

This is all I have:
Image
Yeah i know too much tape, and that cardboard magazine is sad.
I was jsut trying out a copper shell ejecting system.

I also used this same system on a small copper Coaxial.
Image
  • 0

Last edited by al-xg on Fri Oct 26, 2007 1:29 pm, edited 1 time in total.
User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: battlemonkey » Fri Oct 26, 2007 1:12 pm

to Lentamentalisk here is the best diagram i have found to date of how a sprinkler valve works: http://content.answers.com/main/content/wp/en-commons/thumb/d/d3/360px-Solenoid_Valve.png
  • 0

User avatar
battlemonkey
Sergeant First Class
Sergeant First Class
 
Posts: 137
Joined: Sat Sep 22, 2007 3:42 pm
Reputation: 0

Unread postAuthor: Lentamentalisk » Sat Oct 27, 2007 3:39 pm

battlemonkey wrote:to Lentamentalisk here is the best diagram i have found to date of how a sprinkler valve works: http://content.answers.com/main/content/wp/en-commons/thumb/d/d3/360px-Solenoid_Valve.png

Im confused as to how the pilot equalizes with the chamber...

if im not getting this completely wrong, wouldnt it be possible to fill up the chamber from the blowgun?
  • 0

Do not look back, and grieve over the past, for it is gone;
Do not be troubled about the future, for it has not yet come;
Live life in the present, and make it so beautiful that it will be worth remembering.
User avatar
Lentamentalisk
Brigadier General
Brigadier General
 
Posts: 1202
Joined: Tue Aug 07, 2007 5:27 pm
Location: Berkeley C.A.
Reputation: 0

Unread postAuthor: wannabie » Sat Oct 27, 2007 3:52 pm

My bad should have read the post and not just looked at the pic's.
Its a good idea but i would like to know how much performance/distance you use per shot.
  • 0

In epoxy we trust.
User avatar
wannabie
Captain
Captain
 
Posts: 304
Joined: Sun Apr 15, 2007 11:44 pm
Location: Australia
Reputation: 0

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'