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First QEV cannon(With damage-pics and video)

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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First QEV cannon(With damage-pics and video)

Unread postAuthor: AircannonSweden » Tue Aug 07, 2012 5:11 am

I am finally finished with this...The tank is a scuba tank and the QEV is piloted by a 1/4 inch ball valve! I will weld the nipple on sunday :)

Pics:

Image

Image

Image


Damge-pics

This was a syringe-handle shoot with 3 bars from 2 feet! You can see the dent in the wood!
Image

I shoot a lego-brick into a soda-can and it destroyd the plastic box!

In:
Image

Out:
Image
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Last edited by AircannonSweden on Fri Dec 21, 2012 9:10 am, edited 7 times in total.
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Unread postAuthor: doomburger » Tue Aug 07, 2012 10:27 am

Nice gun you got there! :D
I'm pretty sure that's a slide valve with a QEV, so it should be pretty nice going semi auto. I strongly suggest that you put a elbow on the chamber (im guessing its the vertical black tube) to make this gun much more compact and imho, better looking too. If you switch around the elbow and add a tee at the end, it could become a stock too. Post some more info/pictures and damage shots! :)
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Unread postAuthor: AircannonSweden » Tue Aug 07, 2012 11:31 am

doomburger wrote:Nice gun you got there! :D
I'm pretty sure that's a slide valve with a QEV, so it should be pretty nice going semi auto. I strongly suggest that you put a elbow on the chamber (im guessing its the vertical black tube) to make this gun much more compact and imho, better looking too. If you switch around the elbow and add a tee at the end, it could become a stock too. Post some more info/pictures and damage shots! :)


Thank you :) i will replace the tank later,i have a soda stream CO2-tank at home but i gonna buy a hex-nipple first :)
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Unread postAuthor: PotatoEnemy17 » Tue Aug 14, 2012 8:27 am

Awesome, How big is your QEV? Also, what is the ball valve for, you already have a slide valve, right?
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Unread postAuthor: AircannonSweden » Tue Aug 14, 2012 9:57 am

PotatoEnemy17 wrote:Awesome, How big is your QEV? Also, what is the ball valve for, you already have a slide valve, right?


The QEV is 3/8, I bought the QEV on ebay for 9 dollars,the ball valve is the pilot-valve :)
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Unread postAuthor: PotatoEnemy17 » Thu Aug 16, 2012 8:46 am

I get it now. I thought that blue thing was a slide valve. I just finished my QEV air cannon yesterday. :D
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Unread postAuthor: AircannonSweden » Thu Aug 16, 2012 10:51 am

PotatoEnemy17 wrote:I get it now. I thought that blue thing was a slide valve. I just finished my QEV air cannon yesterday. :D


Okey :) Did you make or bought a QEV? :)
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Unread postAuthor: PotatoEnemy17 » Fri Aug 17, 2012 1:43 pm

I bought one off Amazon for 7 bucks. I tried unsuccessfully to make one before but I'm thinking about giving it another shot. (pun not intended)
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Unread postAuthor: AircannonSweden » Fri Aug 17, 2012 3:37 pm

PotatoEnemy17 wrote:I bought one off Amazon for 7 bucks. I tried unsuccessfully to make one before but I'm thinking about giving it another shot. (pun not intended)


Okey :)
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Unread postAuthor: AircannonSweden » Sat Aug 25, 2012 8:23 am

I am finished with the gun and I added some pics! Look at the top (update august 2012)
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Unread postAuthor: PotatoEnemy17 » Sat Aug 25, 2012 5:23 pm

With all the camber volume I bet it's loud. How much pressure? Damage pics?
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Unread postAuthor: AircannonSweden » Sun Aug 26, 2012 2:26 am

I will do some damage pics tomorrow and the chamber preassure is about 6-8 bars :)
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Unread postAuthor: Zeus » Sun Aug 26, 2012 3:59 am

Booo, needs to be semi. But your threading work is clean, which is good to see. And the pilot volume is delightfully small.

And the chamber could be a 1/50 of the size without a decrease in power.
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Unread postAuthor: AircannonSweden » Sun Aug 26, 2012 4:22 am

Thank you :) I know the chamber could be much smaller but i had a bulkhead laying around and that fit perfectly in the tank :)
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Unread postAuthor: AircannonSweden » Mon Aug 27, 2012 5:47 am

I welded the nipple today, it was a little leak in the welding-spots but i fixed it with plastic-paddings super-steel! I will put up some damage-pics later
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