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

pneumatic marker project

Discuss miniature cannons built from things such as pill bottles and pen caps.
Sponsored 
  • Author
    Message

pneumatic marker project

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 2:15 am

Following on from the critically acclaimed pen-gun project, it was apparent that 0.1 inches is far too low a calibre for reasonable power, even at high pressure. I was pondering the possibility of making a second version with a thicker chamber and a larger - probably 0.177" for BBs - barrel, that could be made to fit in the body of a whiteboard marker, or at least made to look like one. Nothing sinister about this deception, it's just a personal facination with covert weapons :) The design I have in mind would include a cap to fire the schrader pilot, as well as an integral supressor by adding vents in the muzzle end of the barrel that would exhaust into the hollow front portion of the body.

The diagram is pretty much self explanatory:
  • 0

Attachments
marker.gif
marker.gif (6.62 KiB) Viewed 1877 times
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: Davidvaini » Thu Feb 28, 2008 2:20 am

A sharpie would be sweet but idk if its too small for your ideas.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 2:26 am

The external diameter of the tube I intend to use as a chamber is around 0.6", I'm sure I'll find a marker it will fit into.
  • 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: Novacastrian » Thu Feb 28, 2008 2:28 am

Is this a reproduction of the little pistol, 3000psi, made in Pakistan- often linked to keyring thing?
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 2:33 am

Novacastrian wrote:Is this a reproduction of the little pistol, 3000psi, made in Pakistan- often linked to keyring thing?


Made in the UK by Steve Harper actually :wink: that uses the Brocock mini cartridge that looks something like this internally, the firing pin literally knocks the valve open.

My design on the other hand is a exhaust valve piston launcher that's basically an evolution of the pen-gun project.
  • 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: Novacastrian » Thu Feb 28, 2008 2:36 am

Furry muff, what pressure where you planning, would a micro pump be in the making or will you utilise existing facilities?

BTW: You would have to be sure to place your gun the "right" way up in your pocket! Otherwise you may have a slug up side your head. :D
  • 0

Last edited by Novacastrian on Thu Feb 28, 2008 2:39 am, edited 1 time in total.
America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 2:39 am

I'm hoping to go high with the shock pump, the problem with the pen-gun is that beyond 250-300 psi it starts to leak from the barrel, so I never exploited the advantage of the tiny chamber to go higher. Of course the gauge is useless at this pressure but I intend to pump as hard as I can, we'll see.

Novacastrian wrote:You would have to be sure to place your gun the "right" way up in your pocket! Otherwise you may have a slug up side your head.


Or in my balls, it's a lose-lose situation :roll: but I don't plan on carrying it around so I'm ok ;)
  • 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

Sponsored

Sponsor
 


Unread postAuthor: Novacastrian » Thu Feb 28, 2008 2:47 am

Looking at your diagram, it appears you have broken one of your nazi rules, namely D/4. :D
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 2:52 am

I never said it was to scale ;p
  • 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: Novacastrian » Thu Feb 28, 2008 2:56 am

jackssmirkingrevenge wrote:I never said it was to scale ;p


I don't want to hear about your bedroom antics! :D
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 3:06 am

Fine, yeesh! Gained a bit of chamber volume too :wink:
  • 0

Attachments
markertoscale.gif
markertoscale.gif (6.5 KiB) Viewed 1838 times
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: Novacastrian » Thu Feb 28, 2008 3:09 am

Good boy, that's better :) Have a cookie. :lol:
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jook13 » Thu Feb 28, 2008 3:10 am

why not make the chamber the whole length? that is what I am seeing right? the chamber being only about 1/3 the length of the whole gun.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: Novacastrian » Thu Feb 28, 2008 3:13 am

I think silencer capabilities may convince otherwise :wink:
  • 0

America, the greatest gangster of all time. With 200 million odd foot soldiers at it's whim and call.
When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

Novacastrian
Major General
Major General
 
Posts: 1604
Joined: Sat Aug 11, 2007 6:59 pm
Reputation: 0

Unread postAuthor: jook13 » Thu Feb 28, 2008 3:24 am

yeah that makes sense to me. the whole covert secret james bond weapon thing... I just thought with a spudder this small you would want as big of a chamber as possible. none the less, I really cant wait to see it completed. even though I am new, I have learned that jsr's projects are worth looking forward to (I have been kinda a lurker)... :D
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Next

Return to Miniature Cannon Discussion

Who is online

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

Reputation System ©'