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First Finished QEV gun

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 Finished QEV gun

Unread postAuthor: jmez1996 » Mon Feb 28, 2011 6:53 pm

This is my first gun upload to spudfiles but about my tenth prototype for ideas on a airgun. I put it together recently and decided to finish it. It took about a year and a half to get to this point.

PARTS: All the parts on the gun are made from high quality stainless steel fittings rated at 3000PSI. and a few brass fittings. The stock is made from stained pine.

BARREL: 6.5mm inside diameter full stainless steel barrel, 520mm long.

VALVE: 1/4" QEV (ebay)

PILOT: 1/4" blowgun, unmodified but had bottom cut off it.

TANK: 3/4" stainless tubing, about 200mm long.

SCOPE: Tasco 4x20. mounted on homemade rail.

FILL VALVE: Pilot side, 1/4" female quick connect coupler.

NORMAL OPERATING PRESSURE: around 200psi


Thanks to everyone here who helped with answering my questions about the valves, methods etc.

If anyone has any questions about the gun or suggestions feel free to ask.

cheers.
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Attachments
26022011402small.jpg
The mechanism of the gun.
insidessmall.jpg
The insides of the gun without the stock.
earlystagessmall.jpg
early stages of putting the gun together.
finishedgunsmall.jpg
The final gun with stock and scope mounted.
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Unread postAuthor: Gun Freak » Mon Feb 28, 2011 6:55 pm

Really nice!! Stock looks great and so do the internals. Are those compression fittings on the SS?
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Unread postAuthor: mark.f » Mon Feb 28, 2011 7:09 pm

Very nice, but I have a question: what's stopping you at 200 PSI? :wink:

Another question: how much did all the stainless and compression fittings cost you? You don't have to say if you don't want to, but maybe, say, relative to copper tubing and fittings of the same size?

Nice job again. Can't wait to see more of you (or even some of those prototypes you've mentioned).

EDIT: nevermind on the price, I have quit being a n00b and have checked McMaster.
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Last edited by mark.f on Mon Feb 28, 2011 8:33 pm, edited 1 time in total.
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Unread postAuthor: jmez1996 » Mon Feb 28, 2011 7:11 pm

thanks :)
yeh compression fittings. all the stainless fittings i got off my uncle who got them from the gas works at a mine site so are really good quality :P

and im limited to 230 psi due to a bike pump. but i might be getting a air compressor soon.
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Unread postAuthor: ilovefire » Mon Feb 28, 2011 7:27 pm

wow, jus.. jus.. just wow and thats all, no wait, video?
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why make it if it dosent shoot?
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Unread postAuthor: Gaderelguitarist » Mon Feb 28, 2011 7:49 pm

Who has two thumbs and is very impressed by your build.....this guy. :D

The perforated metal adds a really nice touch to the finished gun.

You could have perhaps made the grip a little less bulky. It looks like your thumb would interfere with the fill valve.
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Unread postAuthor: ilovefire » Mon Feb 28, 2011 9:00 pm

Gaderelguitarist wrote:You could have perhaps made the grip a little less bulky. It looks like your thumb would interfere with the fill valve.


now that he montions it i think you should defiantly make that grip a lot skinier
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why make it if it dosent shoot?
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Unread postAuthor: Crna Legija » Mon Feb 28, 2011 10:01 pm

Gaderelguitarist wrote:Who has two thumbs and is very impressed by your build.....this guy. :D



bob kelso :lol:



very nice, the thing you have around the chamber looks mad.
shame about 200psi, this would be a beast at 500-700
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Unread postAuthor: Gaderelguitarist » Tue Mar 01, 2011 12:08 am

Looking back, I think it might also look nice to have some of that perforated sheet metal on the stock as well. It would serve no purpose other that aesthetics, which is really all you can do at this point, besides increasing your working pressure.

bob kelso


I'll ignore that....for now.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 1:37 am

-_- wrote:bob kelso:lol:


:D

Very nice, love the perforated metal especially. Up the pressure and you won't be disappointed, though it will probably be time to start thinking about a suppressor ;)
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Last edited by jackssmirkingrevenge on Tue Mar 01, 2011 1:39 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Tue Mar 01, 2011 1:38 am

double post :?
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Unread postAuthor: ilovefire » Tue Mar 01, 2011 2:17 am

dont get me wrong you have a great gun, but i put this together to show you how much better it would look if you used some of the suggestions that have been made
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why make it if it dosent shoot?
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Unread postAuthor: jmez1996 » Tue Mar 01, 2011 3:33 am

thanks everyone for the comments :)

uhm yeh i can comfortably get my thumb under the quick connect but it is a bit tight so i will think about making it thinner now you mention it...
im not sure what else to add to the gun so a suppressor could be a good idea.
ill upload a video when i make one
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Unread postAuthor: Gaderelguitarist » Tue Mar 01, 2011 11:37 am

i put this together to show you how much better it would look if you used some of the suggestions that have been made


Hooray for photoshop. That supressor could easily extend back to cover the rest of the barrel and seat overtop of the qev, giving it a factory made feel...

I'm going to stop now, this isn't my project. Jmez, you've done a great job.
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Unread postAuthor: Alster370 » Tue Mar 01, 2011 12:15 pm

Nice job mate, if you were born in 1996 as included in your name id have to say thats an incredible build for someone of 14/15 years old. I hope when mines finished it will be as good as this. :)
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