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| jackssmirkingrevenge |
 Posted: 02/28/2008 2:15 AM Post subject: pneumatic marker project |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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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: |
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| Davidvaini |
| Posted: 02/28/2008 2:20 AM Post subject: |
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Airsoft and BBMG Expert
Joined: 29 May 2007
Posts: 583
90.58 Spud Bux
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| A sharpie would be sweet but idk if its too small for your ideas. |
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| jackssmirkingrevenge |
| Posted: 02/28/2008 2:26 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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| 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. |
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| Novacastrian |
| Posted: 02/28/2008 2:28 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| Is this a reproduction of the little pistol, 3000psi, made in Pakistan- often linked to keyring thing? |
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| jackssmirkingrevenge |
| Posted: 02/28/2008 2:33 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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| 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  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. |
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| Novacastrian |
| Posted: 02/28/2008 2:36 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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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. 
Last edited by Novacastrian on 02/28/2008 2:39 AM; edited 1 time in total |
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| jackssmirkingrevenge |
| Posted: 02/28/2008 2:39 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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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  but I don't plan on carrying it around so I'm ok |
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| Novacastrian |
| Posted: 02/28/2008 2:47 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| Looking at your diagram, it appears you have broken one of your nazi rules, namely D/4. |
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| jackssmirkingrevenge |
| Posted: 02/28/2008 2:52 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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| I never said it was to scale ;p |
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| Novacastrian |
| Posted: 02/28/2008 2:56 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| jackssmirkingrevenge wrote: | | I never said it was to scale ;p |
I don't want to hear about your bedroom antics! |
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| jackssmirkingrevenge |
| Posted: 02/28/2008 3:06 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6475
9857.68 Spud Bux
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| Fine, yeesh! Gained a bit of chamber volume too |
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| Novacastrian |
| Posted: 02/28/2008 3:09 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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Good boy, that's better Have a cookie.  |
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| jook13 |
| Posted: 02/28/2008 3:10 AM Post subject: |
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Staff Sergeant
Joined: 21 Jan 2008
Posts: 105
246.33 Spud Bux
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| 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. |
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| Novacastrian |
| Posted: 02/28/2008 3:13 AM Post subject: |
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Bloody Aussie
Joined: 11 Aug 2007
Posts: 1622
116.11 Spud Bux
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| I think silencer capabilities may convince otherwise |
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| jook13 |
| Posted: 02/28/2008 3:24 AM Post subject: |
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Staff Sergeant
Joined: 21 Jan 2008
Posts: 105
246.33 Spud Bux
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| 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)... |
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