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The sawn off pneumatic (Contest)

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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The sawn off pneumatic (Contest)

Unread postAuthor: LucyInTheSky » Fri Sep 01, 2006 6:04 am

This is my new copper pneumatic, it uses a 1/2" Quick-Exhaust valve acctuated by a 1/2" Ballvalve. I bent the ballvalve so it acts like a trigger.
Chamber: 550mm x 22mm
Barrel: 600mm x 22mm
Valve: 1/2" Quick Exhaust Valve
Volocity:156m/s
Here are some pictures:
The whole thing, only 75cm long.
This gun was inspired by Brian the brains sawn-off shotgun, its not as good but close enough :D .
It is a kind of longer thiner (shiny) version.

Pics.
Image

I turned down the threads of a 1/4" Dissconnect fitting on my inprovised lathe (put it in a drill chuck) then slid it in some bent 15mm pipe and soldered it in there.

Image
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Last edited by LucyInTheSky on Sat Sep 23, 2006 3:09 pm, edited 3 times in total.
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Unread postAuthor: killagorrila99 » Fri Sep 01, 2006 6:08 am

haha now your just plain copying btbs guns!
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Unread postAuthor: LucyInTheSky » Fri Sep 01, 2006 6:26 am

Maybe I got slight inspiration from them, :lol:
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Unread postAuthor: killagorrila99 » Fri Sep 01, 2006 6:29 am

pfft "slight"? its called copying, get with the program man, btw nice gun!
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Unread postAuthor: LucyInTheSky » Fri Sep 01, 2006 6:50 am

Thanks, TBH the reason I acctualy made this was I was my other one is too powerful for back yard use.
I acctually made the back bit like brains cos thats what I had, that whole gun only cost £2.75 as I only needed to buy one bit the rest I had in my garage.
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Unread postAuthor: Brian the brain » Fri Sep 01, 2006 11:18 am

Well..First of all...I've never used a QEV...

Second..I woul'dn't call a 75 cm gun...sawed off..

Third...I ....don't know..okay??!@?

hehehe...it's not a copy.Barrel and chamber are closer together in my designs.I hate that wide open look.
I like compact.I would "elbow" the chamber back up.
Or rent a pipebender to get a nice flowing design...
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: LucyInTheSky » Fri Sep 01, 2006 1:14 pm

Do you mean like my other gun with the 2 45s?
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Unread postAuthor: Brian the brain » Fri Sep 01, 2006 3:23 pm

exactly. Although I modified ome of the fittings to get the same effect.
I used a 28-22-28 mm Tee to connect the chamber to the 28-28-28- tee the valve is in.
I filed the 22 threads off until I could slip a 28 mm compression ring over it.Used a lot of teflon to make the ring seal over the partially filed threads.
Pretty tricky, because I had almost no room to apply the teflon, once the "cap"and ring were on the 22mm side of the Tee.
I connected the two Tee's INTO each other for a compact look.
That was the major factor for the sawed off look.
I did the same thing with a 22-28 reducer, wich holds the barrel.I filed it until it could fit a compression ring (28mm) over it.
This leaves you with the original 22 mm "inlet"of the reducer to hammer in a piece of 22mm, with a compression ring already on it, as your barrel port.
So no I have a 22 mm port, 28 mm Tee as a piston housing, and a 28 mm barrel.

Well...if you want to copy it...you now know how to..
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: LucyInTheSky » Fri Sep 01, 2006 3:45 pm

Well in stead I am going to get a length on 35mm copper for the chamber so it can be alot shorter.
18cm instead of 55cm.

Here is what what it should look like:

Image
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Unread postAuthor: MrCrowley » Fri Sep 01, 2006 4:09 pm

it looks way better if you do that.
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Unread postAuthor: noname » Fri Sep 01, 2006 7:44 pm

I'd agree with crowley on that one.
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Unread postAuthor: Benny » Fri Sep 01, 2006 8:41 pm

Where did you get the QEV?
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Unread postAuthor: LucyInTheSky » Sat Sep 02, 2006 4:32 am

http://www.airlines-pneumatics.com

UK based so probly wont ship to US
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Unread postAuthor: Benny » Sun Sep 03, 2006 4:18 am

Naa mate..... AUSSIE AUSSIE AUSSIE, OI OI OI.
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Unread postAuthor: LucyInTheSky » Fri Sep 22, 2006 3:33 pm

Heres the pics of my new update, I took brian the brains advice from another thread to make it more compact:

Image

Image

Image

And this is the sight down the barrel, I added a front sight to add to the shot gun look.

Image
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