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 77 users online :: 5 registered, 0 hidden and 72 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Triggered burst disk

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

Triggered burst disk

Unread postAuthor: mikemurph » Tue Aug 18, 2009 8:58 pm

I have been searching the wiki for new ways to trigger my pneumatics. I saw this on the wiki:
http://www.spudfiles.com/spud_wiki/index.php/Triggered_burst_disk
the pressurization between the two burst disks is the most interesting way to me, but i have two questions about this method. one, what kind of pressures are we talking about, I was thinking about half of the pressure it takes to burst the disks. two, does this method work with any kind of burst disk, mine are foil.
I would really like some help on this one so give me some feedback.
P.s. right now i have a single burst disk method with a 3/4" barrel, and 1 1/2" chamber
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: dudeman508 » Tue Aug 18, 2009 10:18 pm

  • 0

Last edited by dudeman508 on Wed Aug 19, 2009 8:36 pm, edited 1 time in total.
User avatar
dudeman508
2nd Lieutenant
2nd Lieutenant
 
Posts: 237
Joined: Thu Jul 03, 2008 9:19 pm
Reputation: 0

Unread postAuthor: GalFisk » Wed Aug 19, 2009 4:03 am

Dudeman: Your link has a period at the end which breaks it.
Mike: The pressure between the burst disks should be about half the chamber pressure, and it needs to be more than half the burst pressure of the burst disks (about 70-80% of the burst pressure should be both safe and reliable). As long as these two criteria are met, it will work with any kind of burst disk.
Follow dudemans link (remove the period at the end of the url) for one working example, in that thread there's a link to another working example. Good luck with your build :)
  • 0


GalFisk
Staff Sergeant
Staff Sergeant
 
Posts: 103
Joined: Mon Feb 28, 2005 4:06 am
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 2:40 pm

Thanks dudeman, my burst disk related searches brought up alot of hybrids, and Im glad you have used this system successfully.
and thanks GalFisk for the in depth info, and for fixing dudemans link.
I Have one more question:
Is this system a whole lot more effective than a simple ball valve about a foot before the actual burst disk. This way seems simpler and quicker beacause there is no extra fiddling with two burst disks.
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 6:29 pm

can anybody answer, or is this just open waters?
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: rp181 » Wed Aug 19, 2009 6:32 pm

My triggered burst disc uses one union, with a angled hole drilled through. A sharp nail is poked, and it fires. I recently outfitted it with a solenoid, which stabs the membrane, and allows remote control.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 6:41 pm

where do you put your solenoid, I have thought about that, but cant think of proper placement
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: c11man » Wed Aug 19, 2009 6:58 pm

mike, are you thinking of a solenoid of a sprinkler beceause rp is talking about the kind that can pus or pull on a pin/rod
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 7:00 pm

no im thinking push pull, just where would i put it on the cannon?
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: c11man » Wed Aug 19, 2009 7:01 pm

oh ic, put in on the barrel side of the union
  • 0

User avatar
c11man
Brigadier General
Brigadier General
 
Posts: 783
Joined: Fri Feb 06, 2009 4:37 pm
Location: Wisconsin, USA
Country: United States (us)
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 7:33 pm

I have a 3/4 inch barrel which doesn't leave room for much
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: rp181 » Wed Aug 19, 2009 7:49 pm

It is in the union footprint. I emailed you pics.
  • 0

User avatar
rp181
Brigadier General
Brigadier General
 
Posts: 1090
Joined: Thu Dec 13, 2007 8:47 pm
Reputation: 0

Unread postAuthor: mikemurph » Wed Aug 19, 2009 8:11 pm

Thanks rp181, that is really helpful, do you think radioshack would carry those?
And what is the exact name of the one you used + where you got it
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Unread postAuthor: THUNDERLORD » Wed Aug 19, 2009 8:50 pm

Cool link.
In theory, it should work with any spud range of pressure.
It will require a lot of testing to figure your burst layers and bursting pressures.
I'd stick close with the reference info page.

Seems like a shrader valve might be a bad choice for the trigger, A presta bike valve would probably be safer (?). 8)

BTW, a sharp point on the back of ammo OR barrel could burst a single disk...but then it needs a trigger mech. to release it.
  • 0

-----SPEED,STRENGTH, AND ACCURACY.-----
"Procrastination" is five syllables for "Sloth".
Theopia 8)
Born To Be Alive!

THUNDERLORD
Major General
Major General
 
Posts: 1264
Joined: Fri Mar 28, 2008 1:42 pm
Reputation: 0

Unread postAuthor: mikemurph » Thu Aug 20, 2009 10:40 am

So in your opinions triggering it the way i originally stated is the easiest way to do it, but i still want to know about the ballvalve before the burst disk
=====[O]=======( l )=====
burst disk ball valve chamber=>
<=barrel


BTW, a sharp point on the back of ammo OR barrel could burst a single disk...but then it needs a trigger mech. to release it.

I would do this for a mortar type weapon, but i only have a 3/4 inch barrel

Seems like a shrader valve might be a bad choice for the trigger, A presta bike valve would probably be safer (?).

Whats a presta bike valve?[/quote]
  • 0

User avatar
mikemurph
Sergeant
Sergeant
 
Posts: 99
Joined: Wed Apr 29, 2009 9:43 pm
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'