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First 6mm qev camo sniper rifle

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 6mm qev camo sniper rifle

Unread postAuthor: jonesy42 » Sat Aug 25, 2012 9:32 am

My first qev rifle, not quite finished yet,... here's a few pics

Special thanks to JSR for "spoon feeding" me with some
qev know-how :idea: :)
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ECP_00043.jpg
ECP_00043.jpg (36.74 KiB) Viewed 2787 times
ECP_00044.jpg
ECP_00044.jpg (38.91 KiB) Viewed 2785 times

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Unread postAuthor: far_cry » Sat Aug 25, 2012 1:53 pm

good job ,cant wait to see it in action .
what pressure you whant to use ?
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Unread postAuthor: anarchy08 » Mon Aug 27, 2012 4:53 am

just getting a better look, thats a huge chamber volume for 6mm? dont think you will need heaps of pressure that way. im running about 30cc @ 250 psi and going through paint cans with steel bb's but need more volume i believe for my C-B ratio
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jackssmirkingrevenge » Mon Aug 27, 2012 5:13 am

jonesy42 wrote:Special thanks to JSR for "spoon feeding" me with some
qev know-how


As long as it was for a good cause :) so, do we get to see it in action?
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Unread postAuthor: mr.potatohead » Tue Aug 28, 2012 4:55 pm

thats very niice you should make interchangeable barrels a 6mm barrel and a 4.5mm (.177) barrel
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jonesy42 » Thu Aug 30, 2012 9:45 am

jackssmirkingrevenge wrote:
jonesy42 wrote:Special thanks to JSR for "spoon feeding" me with some
qev know-how


As long as it was for a good cause :) so, do we get to see it in action?



Of course it is used for good cause jack :wink:
I have not used it with the paintball tank yet...(waiting on a fitting to arrive)
I have only used it with a 100psi compressor so far, and it puts plastic
6mm bbs through 1/4 ply board @20 metres no problem. So i figure
it should go like a rocket with 300psi.... Also it is a lot more
accurate shooting with 14grain steel 6mm bearings than
the .25grain plastic bbs. I'll post some damage/target grouping pics
when running @300psi soon.
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Unread postAuthor: jonesy42 » Thu Aug 30, 2012 10:05 am

mr.potatohead wrote:thats very niice you should make interchangeable barrels a 6mm barrel and a 4.5mm (.177) barrel



Do you know where to get .177 or .22 rifled barrells from?
I got this one off ebay, its a 650mm 6.03 id airsoft
barrell. I would much prefer a proper rifled barrell,
but they are hard to get hold of in australia?
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jonesy42 » Thu Aug 30, 2012 10:36 am

jackssmirkingrevenge wrote:
jonesy42 wrote:Special thanks to JSR for "spoon feeding" me with some
qev know-how


As long as it was for a good cause :) so, do we get to see it in action?



Hey jack, i forgot to mention in my last post..... A fair
bit of air comes out the bottom of the trigger/pilot when it is
fired.... Is this normal, or is my firing tank to big and im
wasting air through my trigger?.
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Unread postAuthor: jonesy42 » Thu Aug 30, 2012 10:49 am

far_cry wrote:good job ,cant wait to see it in action .
what pressure you whant to use ?


I have 2 ninja regulators with remote lines. One is
300psi regulated and the other is 800psi regulated.

Do you play "far cry" on ps3 lol,.. i have that game
too.
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jackssmirkingrevenge » Thu Aug 30, 2012 12:34 pm

jonesy42 wrote:Hey jack, i forgot to mention in my last post..... A fair
bit of air comes out the bottom of the trigger/pilot when it is
fired.... Is this normal, or is my firing tank to big and im
wasting air through my trigger?.


Remind me, this isn't semi auto right, you're dumping all the air from the chamber?

Naturally whatever is in the pilot area is "wasted" in the sense that it doesn't go towards propelling the BB, and the bigger the pilot area is then the lower the rate of pressure drop and the slower the valve opens.

There are ways to design a piston valve to avoid the "waste" by exhausting the pilot down the barrel:

Image

I don't think the added complication would be worth it though.
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: MrCrowley » Thu Aug 30, 2012 5:10 pm

jackssmirkingrevenge wrote:I don't think the added complication would be worth it though.
Considering you now have a mini-lathe, I think the coolness factor of this design would make it worth your while :wink:

I'd like to see the design get built, even if it's only so someone can say they've made it.
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jackssmirkingrevenge » Thu Aug 30, 2012 5:29 pm

MrCrowley wrote:Considering you now have a mini-lathe, I think the coolness factor of this design would make it worth your while :wink:


But dude, it's all like... air powered... where do you put the ignitor :?

I'd like to see the design get built, even if it's only so someone can say they've made it.


Well, technically anyone who has a dishwasher or washing machine has a valve that works like this.

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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jonesy42 » Fri Aug 31, 2012 1:25 am

jackssmirkingrevenge wrote:
jonesy42 wrote:Hey jack, i forgot to mention in my last post..... A fair
bit of air comes out the bottom of the trigger/pilot when it is
fired.... Is this normal, or is my firing tank to big and im
wasting air through my trigger?.


Remind me, this isn't semi auto right, you're dumping all the air from the chamber?

Naturally whatever is in the pilot area is "wasted" in the sense that it doesn't go towards propelling the BB, and the bigger the pilot area is then the lower the rate of pressure drop and the slower the valve opens.

There are ways to design a piston valve to avoid the "waste" by exhausting the pilot down the barrel:


Yes, i want it to be semi-auto. it will have 300psi regulated air supply from
the paintball tank eventually.... I got a couple of those parker 3 way valves
for triggers you mentioned a while back too, should i be using them for semi-auto
instead of the blowgun trigger thats on it now?..... I put that blowgun trigger on because
it was easy to fit to the stock, and i also wanted to test it out with my compressor to
see how it shot with 100psi.


Image

I don't think the added complication would be worth it though.
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jackssmirkingrevenge » Fri Aug 31, 2012 3:22 am

jonesy42 wrote:Yes, i want it to be semi-auto. it will have 300psi regulated air supply from
the paintball tank eventually.... I got a couple of those parker 3 way valves
for triggers you mentioned a while back too, should i be using them for semi-auto
instead of the blowgun trigger thats on it now?..... I put that blowgun trigger on because
it was easy to fit to the stock, and i also wanted to test it out with my compressor to
see how it shot with 100psi.


Yup, for semi auto you want to connect the 3 way valve to the rear of the QEV, then leave one port open to the atmosphere, and connect the other to the regged air supply.

MrCrowley wrote:I'd like to see the design get built, even if it's only so someone can say they've made it.


addendum: if you're going to bother making a pull operated trigger with two sealing o-rings, you're better off making a QDV directly...
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Re: First 6mm qev camo sniper rifle

Unread postAuthor: jonesy42 » Fri Aug 31, 2012 7:26 am

jackssmirkingrevenge wrote:
jonesy42 wrote:Yes, i want it to be semi-auto. it will have 300psi regulated air supply from
the paintball tank eventually.... I got a couple of those parker 3 way valves
for triggers you mentioned a while back too, should i be using them for semi-auto
instead of the blowgun trigger thats on it now?..... I put that blowgun trigger on because
it was easy to fit to the stock, and i also wanted to test it out with my compressor to
see how it shot with 100psi.


Yup, for semi auto you want to connect the 3 way valve to the rear of the QEV, then leave one port open to the atmosphere, and connect the other to the regged air supply.

MrCrowley wrote:I'd like to see the design get built, even if it's only so someone can say they've made it.


addendum: if you're going to bother making a pull operated trigger with two sealing o-












rings, you're better off making a QDV directly...



Okay cheers jack, in that case i think the hardest bit will plumbing in the the 3 way trigger/valve to nicely suit my stock i reckon.... Can you use flexible hpa type tubing to plumb the 3 way valve in you think?... Also i have another pre-maid (Barnett predator) crossbow stock i want to turn into a air rifle as well, so i'll check em both out and see what suits what the best.
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Attachments
ECP_00049.jpg
"Barnett predator" crossbow stock and parker 3 way valve trigger
ECP_00051.jpg
paintball tanks, remote lines etc with "ninja" 300psi SLP regulator, and a "ninja" 800psi regulator on the small bottle, is how it come brand new.
ECP_00050.jpg
ECP_00050.jpg (38.89 KiB) Viewed 2474 times
ECP_00048.jpg

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