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My first gun using QEV 20bar

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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Do I dare to take it up to 15 Bar?

YES
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80%
NO
3
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Total votes : 15
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My first gun using QEV 20bar

Unread postAuthor: GustavssonB » Mon Aug 06, 2012 1:17 pm

This i my first try using a QEV and I´m very happy with the result:)

Image

I´m using the gun on 8-20 Bars pressure

I´m using:
a fire extinguisher of 1.25 liters that can hold up to 30 bar,
The original extinguisher pressure guage which I vill replace soon,
I´m using a QEV that is 3/4 inch 19 mm
And a ball valve to pilot it

Here is some pictures of the build:

The extinguisher before I put my hands on it:
Image
After:
Image
Image

And here is the adapter I made for for the guage
Image
Image

Closeup on the QEV:
Image

And here is the pilot valve and quick connect mounted on the tank
Image

The scope
Image

And some pictures of the complete gun
Image
Image

The ammo
Image

The gun has now been pushed to 20 bar, and still hasn't exploaded in my face :D

Image[/b]
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Last edited by GustavssonB on Wed Aug 22, 2012 7:54 am, edited 4 times in total.

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Unread postAuthor: Labtecpower » Mon Aug 06, 2012 1:47 pm

that looks very clean and solid!

Could you find any way to hide the tie-wraps? they bug the overall clean look a bit :wink:
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Unread postAuthor: GustavssonB » Mon Aug 06, 2012 2:03 pm

Thanks!:)

Yea now when you say it, it really bugs me off to.. before u did I didn't even noticed :P
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Unread postAuthor: POLAND_SPUD » Mon Aug 06, 2012 2:05 pm

ze chamber... it's too big !!

get a lenght of 1/2" pipe and use that as your chamber and the extinguisher as the reservoir/air tank
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Unread postAuthor: mattyzip77 » Mon Aug 06, 2012 3:36 pm

Nice clean build. Very good job. I like the tie wraps!!
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Unread postAuthor: MrCrowley » Mon Aug 06, 2012 4:35 pm

Very nice build! The chamber is a bit big so like POLAND_SPUD said, you could have it as an air reservoir instead, have a much smaller chamber and use a slide valve or similar to make the gun semi-auto.
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Unread postAuthor: AircannonSweden » Mon Aug 06, 2012 5:48 pm

Very nice :D BTW,are you from Sweden? :)
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Unread postAuthor: Zeus » Mon Aug 06, 2012 8:06 pm

Nice work, huge chamber as others have said, and the scope is completely unnecessary.
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/sarcasm, /hyperbole
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Unread postAuthor: GustavssonB » Tue Aug 07, 2012 12:05 am

Thanks everyone for the positive respons:) yes the chamber is little big, I have been thinking on making it semi-automatic but I still haven't found a clean design for it but i'm planning on it:)

Yes AirCannonSweden I'm from Sweden:D
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Unread postAuthor: GustavssonB » Tue Aug 07, 2012 12:10 am

Zeus wrote:Nice work, huge chamber as others have said, and the scope is completely unnecessary.


I don't think it's unnecessary when I can use it to hit small targets att 20 yards or even longer while using it:)
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Unread postAuthor: Zeus » Tue Aug 07, 2012 1:31 am

Well, considering the potential accuracy from a smoothbore is fairly limited, a set of iron sights would be adequate, and if you're set on having optics, a red dot would be perfect.

[hunting] I use iron sights on my .22lr out to 120m, and get a fair few bunnies at 70-80m. Optics aren't essential. Still waiting on a >100m shot on a fox.

[/hunting]

Good work on the optics mount too, it's a scope torch mount right?


And last time I checked hunting with a firearm isn't in the rules.
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Unread postAuthor: AircannonSweden » Tue Aug 07, 2012 3:48 am

GustavssonB wrote:Thanks everyone for the positive respons:) yes the chamber is little big, I have been thinking on making it semi-automatic but I still haven't found a clean design for it but i'm planning on it:)

Yes AirCannonSweden I'm from Sweden:D


Yeeeeyyy :D
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Unread postAuthor: GustavssonB » Tue Aug 07, 2012 5:21 am

Is there any way to calculate how small chamber I can use before I'm loosing power? I want the chamber to be as small as possible so that the extinguisher last for as mant shots as possible:)
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Unread postAuthor: Crna Legija » Tue Aug 07, 2012 8:01 am

GustavssonB wrote:Is there any way to calculate how small chamber I can use before I'm loosing power? I want the chamber to be as small as possible so that the extinguisher last for as mant shots as possible:)


download GGDT it can help but if you go with a chamber same volume as your chamber you'll be fine.
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Unread postAuthor: silentkill12345 » Wed Aug 08, 2012 7:08 am

looks like the gun i am building ;) i post it when i am statisfied with it...
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