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smallest ever 3/4" pneumatic

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smallest ever 3/4" pneumatic

Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2007 1:00 am

Following on the success of my pneumatic pengun project, here's my latest high pressure mini coaxial :D

Ok, so it's actually the round for my preloaded pneumatic cartridge project, but since it's a launcher in its own right, I thought it deserved a thread here.

I haven't taken it to full pressure yet, but here's a video at around 150 psi - ammunition is a permanent marker cap. Ok, not that impressive going through cardboard, but considering the "barrel" is less than 1 inch long, I was pretty impressed. And the little blighter is *loud*, sorry the video is without sound by sis has "borrowed" my good camera :-/

[youtube]http://www.youtube.com/watch?v=8ElQIX8vd3M[/youtube]

This is what the internals look like:

Image

High pressure testing with the thing actually attached to the barrel to follow later, follow the cartridge thread.

For more detailed information on using epoxy, check out the how-tos here and here.

Any questions, feel free to ask :)
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Unread postAuthor: hi » Thu Aug 09, 2007 1:05 am

well im impressed, thought im slightly confused.

in your original design the piston sealed against the "bushing" and here is looks like it is just a small coaxial. which is it?
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Unread postAuthor: spud yeti » Thu Aug 09, 2007 1:07 am

That looks really good, especially for just 1" barrel.
Do you cut the schrader valve to make it more compact?
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really good quote/phrase here
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2007 1:22 am

hi wrote:in your original design the piston sealed against the "bushing" and here is looks like it is just a small coaxial. which is it?


I scrapped the original design and went for something slightly less efficient but more reliable, this design is effectively a 6mm coaxial - in fact, I though I'd try it with an airsoft BB :D At 100 psi it went through both sides of the cardboard box and through the card backing.

[youtube]http://youtube.com/watch?v=Ec0kEs4k4NY[/youtube]

Technically I *could* use it as a cartridge for a 6mm high velocity airsoft rifle but the whole idea of having to align the barrel with the breech puts me off, before i get a lathe I'd rather have a cartridge made out of the same tubing I'll be using as a barrel.

Do you cut the schrader valve to make it more compact?


Yeah, I cut it with a hacksaw at the point where the valve stem ends.
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Unread postAuthor: wannabie » Thu Aug 09, 2007 2:04 am

wow thats really nice i thought having it go through the 6mm tube would cut the performance alot more then it did :P

ps. i see your shooting a shoe box... would that be one of the many items purchased because your girlfreind made you go shopping?
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Unread postAuthor: shud_b_rite » Thu Aug 09, 2007 2:13 am

That thing is awesome man. With a longer barrel and perhaps larger chamber that thing could slice bricks in half (not actually). You must be good with epoxy to make small parts like that. Good work.
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Airbeds... so many different uses
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2007 2:26 am

wannabie wrote:ps. i see your shooting a shoe box... would that be one of the many items purchased because your girlfreind made you go shopping?


Actually it's my new safety shoes from work :P

You must be good with epoxy to make small parts like that. Good work.


A combination of patience, sweat, tears and profanity - epoxy is a matter of "If at first you don't succeed..." hehe
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Unread postAuthor: zomgwtfbbq » Thu Aug 09, 2007 2:36 am

Awesome! I can't wait to see more.
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 09, 2007 3:32 am

zomgwtfbbq wrote:Awesome! I can't wait to see more.


here you go :D

Jack is a very happy bunny :)

I hooked up the cartridge to a 2 foot length of 17mm barrel, loaded up a marble, set up a sheet of 1/4" ply et voila

[youtube]http://www.youtube.com/watch?v=xn6H_pOEOHE[/youtube]

This was at around 350 psi, looks like the power potential is there - not to devise a launcher to fire it. On the bright side, if it doesn't eject successfully, I could always build a double barrel sawn-off shotgun :D
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Unread postAuthor: wannabie » Thu Aug 09, 2007 3:38 am

sweeetttt a double barrel shotgun would still pwn :P
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Unread postAuthor: frankrede » Thu Aug 09, 2007 3:40 am

double barrel would indeed be interesting.
And it would be too hard to make it work like one too.
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Unread postAuthor: subterranean » Sat Aug 20, 2011 10:27 pm

Found this page looking for ideas to build my own double barreled sawn off. I am super happy and disappointed at the same time :) :( O well my build wont quite be original but in still going through with it.

I have stolen different aspects of other ppls designs for this thing :)

how do you feel 3in of 1/2" copper with a "1/4" brakeline barrrel as the cartridge.

130psi probably considering i will use propane to fill the carts 8) stole that little trick from the world of airsoft.

does this sound ok?
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Unread postAuthor: Crna Legija » Sat Aug 20, 2011 10:39 pm

subterranean wrote:Found this page looking for ideas to build my own double barreled sawn off. I am super happy and disappointed at the same time :) :( O well my build wont quite be original but in still going through with it.

I have stolen different aspects of other ppls designs for this thing :)

how do you feel 3in of 1/2" copper with a "1/4" brakeline barrrel as the cartridge.

130psi probably considering i will use propane to fill the carts 8) stole that little trick from the world of airsoft.

does this sound ok?


I don't get why you posted this here.
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Unread postAuthor: subterranean » Sat Aug 20, 2011 10:46 pm

hmm. Can a mod please delete my post :oops:
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 21, 2011 12:19 am

Crna Legija wrote:I don't get why you posted this here.


Well it is sort of relevant.

how do you feel 3in of 1/2" copper with a "1/4" brakeline barrrel as the cartridge.

130psi probably considering i will use propane to fill the carts 8) stole that little trick from the world of airsoft.

does this sound ok?


It sounds ok for airsoft skirmishing, something like this:

Image

It has a mechanical pilot but performance should be around the same.
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