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Coaxial Pistol

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Coaxial Pistol

Unread postAuthor: singularity » Wed Oct 03, 2007 2:07 pm

this was built about a year and a half ago, i didn't post for some reason i can no longer remember. it is the smallest coaxial i have ever built (though it doesn't break any records for its size) and i believe it was based of a design i found here a long time ago. its primary ammo is Nerf darts, and its a hell of alot more powerful than any stock Nerf gun i have ever used. the grip came from a dead airsoft FAMAS my friend had, in the bottom there is a small compartment which can be used to store ammo (Nerf darts)

...specs...

primary valve-----------1.25" diaphragm valve
diaphragm material-----1/8" neoprene rubber
pilot valve---------------115psi pop-off
fill valve-----------------schrader
trigger-------------------metal rod (actuates the pop off)
primary ammo----------Nerf darts
range--------------------50 to 80ft
operating pressure-----100psi
chamber diameter------1.25 inches
barrel diameter---------1/2 inch


...pics...

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2162.jpg">

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2163.jpg">

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2164.jpg">

<img src="http://i78.photobucket.com/albums/j85/irwinner_2006/DSCN2165.jpg">
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Last edited by singularity on Wed Oct 03, 2007 3:29 pm, edited 1 time in total.
be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: spanerman » Wed Oct 03, 2007 2:08 pm

Man thats kool, and damage pics? great idea for a trigger 8.9/10 hehe
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Unread postAuthor: MrCrowley » Wed Oct 03, 2007 2:57 pm

I've seen this before somewhere, maybe you posted it somewhere. Like before I love the trigger setup.
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Unread postAuthor: ALIHISGREAT » Wed Oct 03, 2007 3:07 pm

i like the pistol look, and the Famas handle is a cool. also what size is the barrel, if its 3/4" you should test it with some paintballs
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Unread postAuthor: singularity » Wed Oct 03, 2007 3:29 pm

there i edited the specs so the barrel and chamber size show up
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 03, 2007 3:52 pm

nicely done, you could have got more power by extending the barrel and disguising it as a suppressor and upping the pressure a little, small chambers love shock pumps ;)
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Unread postAuthor: singularity » Wed Oct 03, 2007 4:14 pm

quote]small chambers love shock pumps[/quote]

i know i attempted to pump it to 160 using my bike pump once, but it went off at 120. i sat there wondering what the hell just happened then remembered i was using a 115psi pop off... im trying to find like a 200psi pop off thats not to big but as of right now i got noting
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: goose_man » Wed Oct 03, 2007 4:15 pm

A true beauty. I really like your trigger setup as well. Supercool gun! Nice and compact...

-goose_man
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 03, 2007 4:17 pm

You could have the trigger rod push a lever that presses on the schrader stem :) assuming you kept your piston travel to d/4.
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Unread postAuthor: singularity » Wed Oct 03, 2007 5:22 pm

You could have the trigger rod push a lever that presses on the schrader stem Smile assuming you kept your piston travel to d/4.


its a diaphragm and there is way to much pilot volume, i did try using the schrader to pilot it after seeing your pen gun but sadly it was very weak.
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: benstern » Thu Oct 04, 2007 12:05 am

MrCrowley wrote:I've seen this before somewhere, maybe you posted it somewhere. Like before I love the trigger setup.


Thats what I thought too! I can swear I have see this before too.
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Unread postAuthor: flamerz14 » Thu Oct 04, 2007 9:31 am

:D nice one....now turn it into a carbine :twisted: :twisted:
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well, this isn't much isn't it?

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Unread postAuthor: meatballs » Thu Oct 04, 2007 3:01 pm

singularity please dont try that gun above 100 psi. From participating in its construction, i know that the 1 1/4" male adapter and coupler were put together using a 1" coupler instead of a piece of 1 1/4" pipe. The 1" coupler was not a snug fit, with a millimeter or two of wiggle room around it. this means you don't have good contact for a solvent weld. also, it is not long enough to completely fill either 1 1/4" socket. Also, to avoid stains (which would have ended up painted over) primer was not used in assembly. so really, 100psi isn't in what i would consider a reasonably safe pressure range, except that i have used it at that pressure many times so i trust it not to fail. Also, the barrel cuts into the diaphragm a little at 100 psi, and it could get blown out since it isn't pressure rated. that wouldn't be a major problem as long as the barrel wasn't pointed at anyone, but still, not good. so i dont think it would be a good idea to exceed the limits of the 115psi pop off.
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Unread postAuthor: VH_man » Thu Oct 04, 2007 7:23 pm

consider yourself an inspiration. time to make one of these, exept out of galvanized steel and .68ID aluminum tubing........... 200 PSI PB pistol? lol.
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