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8mm coaxial

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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8mm coaxial

Unread postAuthor: ilovefire » Sun Mar 27, 2011 9:14 pm

hey this is my new gun i just finished, still needs a stock and am still waiting for the epoxy to dry on the barrel so testing and vids will have to wait till tomorrow

barrel: 8mm x 1m (soon to be 70cm)
chamber: 40cm x 14mm
pilot valve: blowgun
piston: solid rubber
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why make it if it dosent shoot?
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Unread postAuthor: Gaderelguitarist » Sun Mar 27, 2011 9:21 pm

I like it. Very very clean. Can't wait to see what you do with the stock.
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so many muchness
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Re: 8mm coaxial

Unread postAuthor: mark.f » Sun Mar 27, 2011 9:34 pm

ilovefire wrote:piston: solid rubber


As it should be, with zero serviceability. :wink:

Nice, clean build, as all of your projects are.
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Re: 8mm coaxial

Unread postAuthor: ilovefire » Sun Mar 27, 2011 11:16 pm

mark.f wrote:
ilovefire wrote:piston: solid rubber


As it should be, with zero serviceability. :wink:

Nice, clean build, as all of your projects are.


hey! all my guns are serviceable... you just have to cut a couple cm's of the end to do it :lol: ha ha ha so yea thats why i opted for the solid piston, did think about making it out of layers of rubber but then decided against it for that reason. oh and thanks guys, will post a design i have in mind for the stock soon just have to do it up i photoshop, cant wait to test this thing with 400psi :o
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Unread postAuthor: jackssmirkingrevenge » Mon Mar 28, 2011 1:23 am

mark.f wrote:As it should be, with zero serviceability. :wink:


All is discovered; flee at once! :D

I hope you reinforced the breech in order for the piston to have plenty of area to spread the force on.

hey! all my guns are serviceable... you just have to cut a couple cm's of the end to do it


The epoxy builders' mindset :D I wonder though, why not make it a hybrid? The power potential is much greater and in design terms it wouldn't have been that different.

a design i have in mind for the stock


ooh ooh bullpup! Any my usual recommendation of an integral suppressor over that skinny barrel ;)
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Unread postAuthor: ilovefire » Mon Mar 28, 2011 1:54 am

jackssmirkingrevenge wrote:
mark.f wrote:As it should be, with zero serviceability. :wink:


All is discovered; flee at once! :D


ha ha interesting story but as with a lot of your links i cant see its point :lol:

jackssmirkingrevenge wrote:I hope you reinforced the breech in order for the piston to have plenty of area to spread the force on.


you mean the start of the barrel? no i didnt, if i did i believe it would have started to chock the flow

jackssmirkingrevenge wrote:
hey! all my guns are serviceable... you just have to cut a couple cm's of the end to do it


The epoxy builders' mindset :D I wonder though, why not make it a hybrid? The power potential is much greater and in design terms it wouldn't have been that different.


i think hybrids are great and all with the power and size but its all to annoying for me if i just want to shoot stuff, you have to have the gas the syringe the burst disks then you have to load it and all and then theres the ignition which can be annoying click* click* click* boom! i like the idea that i can just pump it up put in ammo and one go boom

jackssmirkingrevenge wrote:
a design i have in mind for the stock


ooh ooh bullpup! Any my usual recommendation of an integral suppressor over that skinny barrel ;)


ha ha thought about bullpup but without proper sights it would be a pain in the ass the aim, as for the skinny part of the barrel thats coming of when i make the stock so it a little more compact, thought about making a suppressor but i think i might just save on the bolk, when i test it at 400psi i might see it it needs suppression and posible make something for it but at the moment i have no plans to do so, as for the stock i was thinking of maybe something like this
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Unread postAuthor: jakethebeast » Mon Mar 28, 2011 6:50 am

NICE! :D This is turning to be a one beautiful gun, and PLEAASE make it a bull-pup! :) [/url]
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Unread postAuthor: ilovefire » Mon Mar 28, 2011 7:08 am

thanks :D i did a 200psi test today and it didnt seem to be all that impressive but i guess ill have to see what it can do with 400
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Unread postAuthor: JDP12 » Mon Mar 28, 2011 8:44 am

Things I've found with small bore, high pressure is really needed to get any achievable results. I'm sure you'll be happier with results at high pressure.
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Unread postAuthor: saefroch » Mon Mar 28, 2011 8:50 am

Dang that's a really clean build. I like! Plenty of opportunity for some interesting re-bodying.

JDP12 wrote:Things I've found with small bore, high pressure is really needed to get any achievable results. I'm sure you'll be happier with results at high pressure.
At high enough pressures, you can generate more recoil than a conventional launcher of comparable size :D

Ramp up the pressure until you can comfortably shoot through a backstop. That's how you know it's high enough.
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Unread postAuthor: JDP12 » Mon Mar 28, 2011 8:54 am

Indeed. I get alot of my inspiration from Mitchza's guns. Small bore, but extremely impressive results.
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Unread postAuthor: ilovefire » Mon Mar 28, 2011 7:14 pm

the thing is you all may call this a small bore gun but its actually the largest bore gun i have and at 200psi i would have thought it would have been able to at least go through what my cane gun (5mm) can do at 400psi, yet it couldnt, but anyway i will be doing some 400psi testing this morning

edit: well, the blow gun leaks when i get anymore then 200, and 200 is quite sh*t, im starting to think this is a was of money, im more impressed with my cane gun at 200psi :evil:
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Unread postAuthor: Zeus » Mon Mar 28, 2011 8:37 pm

[Edit] I've never worked with such blowguns, it just looked around the wrong way.

They look really awkward to use, personally I spend an extra $2 and get a nice one.
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Last edited by Zeus on Tue Mar 29, 2011 12:21 am, edited 1 time in total.
/sarcasm, /hyperbole
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Unread postAuthor: Gun Freak » Mon Mar 28, 2011 8:51 pm

Zeus wrote:Well you do have the blowgun around the wrong way, they leak quite easily like that.

Wrong.

Looks very nice and clean, ilovefire. The stock will look awesome. I think it may deserve a scope if it is powerful enough at 400.
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Unread postAuthor: mark.f » Mon Mar 28, 2011 9:37 pm

Maybe just replace the blowgun with a ball valve for now until you can find a better solution? If it's on the right way I don't see why it would leak, but then again they are only rated for 90 PSI. :wink:
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