Page 1 of 3

smallest *working* gun on spudfiles: pico-ax

Posted: Sat Feb 27, 2010 11:42 am
by jackssmirkingrevenge
After this recent challenge I couldn't help but rise to the task of making the smallest possible (within reason) co-axial. Since the irreducable component is the schrader filling/pilot valve, I figured I might as well use the schrader body as the chamber.

Barrel is a 10mm long 1mm calibre length of brass tube, naturally power is laughable at best, a steel BB will ricochet off a sheet of paper - but it works :)

edit: did some more testing cranked up to 500 psi, a 1mm BB will happily punch through 2 sheets of paper. I tried using a length of 1mm rod as ammunition to make it more visible in high speed, the heavier weight and reduced velocity made it ricochet off the paper.

[youtube][/youtube]

[youtube][/youtube]

Here's a test video at 1000 frames per second:

[youtube][/youtube]

edit: cleaned it up on my drill-in-vice "lathe" and updated the photos.

Posted: Sat Feb 27, 2010 11:50 am
by POLAND_SPUD
kudoz :shock:

Posted: Sat Feb 27, 2010 11:52 am
by far_cry
wow that one piece of art :) :)

i think this canon can be used by the fly's between them :D

Posted: Sat Feb 27, 2010 11:53 am
by Hawkeye
Nice. You could probably modify a cap gun and use a bunch of these as shells.

Posted: Sat Feb 27, 2010 12:14 pm
by qwerty
Cool, whats the chamber?

Posted: Sat Feb 27, 2010 12:29 pm
by Brian the brain
Pico-ax LOL!!!
Cool, whats the chamber?
The chamber is the part where the pressure is stored.
AKA the reservoir...

:D

How big of you to rise to the occasion JSR...
Too bad the power is so bad.

You might need a better exhaust valve..like a 2" piston valve perhaps..
Pilot volume is probably too big ..
You could GGDT this little forker to optimise dimensions..or make that minimise..

:lol:

More serious:
Maybe you could add a stock or something to turn it into a true miniature piece of art.

Posted: Sat Feb 27, 2010 1:15 pm
by jackssmirkingrevenge
You could probably modify a cap gun and use a bunch of these as shells.
Certainly a possibility but you're want to scale it up a little, more like this.
How big of you to rise to the occasion JSR...


JSR - always keen to show that he's not compensating for anything :D
Too bad the power is so bad.
Technically at 800 psi there will be around twice the power, who knows it might actually penetrate a sheet of paper :roll:
Maybe you could add a stock or something to turn it into a true miniature piece of art.
The artist in me has long since died, function over form FTW! In that sense, it's not worth fiddling with something that will do more damage to the target if I drop it on it :)

Posted: Sat Feb 27, 2010 2:14 pm
by deathbyDWV
Holy crap!!! That is amazing. Very impressive JSR...

Posted: Sat Feb 27, 2010 2:43 pm
by maverik94
After this recent challenge I couldn't help but rise to the task of making the smallest possible (within reason) co-axial.
Haha, JSR, I had a feeling this was going to happen :D Anyway, even though the power sucks, it's still a cool novelty item!

Posted: Sat Feb 27, 2010 3:31 pm
by jackssmirkingrevenge
maverik94 wrote:Haha, JSR, I had a feeling this was going to happen :D
It was inevitable I would push the boundaries eventually :) added some more videos to the original post.

Posted: Sat Feb 27, 2010 3:39 pm
by Brian the brain
I was kinda hoping you would take to the pico-ax suggestion as you did to the rattlesnake thing.... :D

Posted: Sat Feb 27, 2010 3:43 pm
by jackssmirkingrevenge
hehe point taken :)

Posted: Sat Feb 27, 2010 3:56 pm
by Brian the brain
Thanks buddy.

The thing is..I have only one mind...as far as we know.

I do the same thing with words as I do with fittings.. :D

Posted: Sat Feb 27, 2010 5:45 pm
by jeepkahn
JSR - always keen to show that he's not compensating for anything
He's just working in scales that are familiar to him... :D

Posted: Sat Feb 27, 2010 6:29 pm
by inonickname
Could be mighty inconspicuous if the rubber was left in place, but that's still so cool.

Seen as I have machining facilities I should make some mini schraders and distribute them among the crazies here.