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my second 6mm. custom QEV sniper airgun updated

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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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Thu Mar 13, 2014 10:58 am

the modification looks like this
I attached the tank to the chamber, and as a pilot I used a slightly different type of Schrader valve used in my line of work.
The problem is that once I fire it goes boom like expected, :D , but after the piston does not shut instantly, and it goes like "sssssssshhhhhhhhhhttt....". I mention that I just tap the pilot to fire. I intend on making something like a hammer to fire.
Can anyone tell me the possible problem ?


PS: I use unregulated co2 on this cannon
how tough must the spring behind the piston be ?
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Sun Mar 16, 2014 6:22 am

problem solved by sandpapering the piston a little and by replacing the spring with a stronger one. triggering system is next :wink:
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: jackssmirkingrevenge » Sun Mar 16, 2014 7:21 am

replacing the spring with a stronger one


hammer spring or piston spring?
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Sun Mar 16, 2014 10:52 am

piston spring, I haven't made the hammer yet
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Re: my second 6mm. custom QEV sniper airgum

Unread postAuthor: bladeul2006 » Fri Jun 27, 2014 12:36 pm

I got a nice big piece of solid wood, and I probably start making a stock for this airgun.
some pics of current work, the pilot is a Schrader valve (hope I spelled it right), which is going to be pressed by a old/western style pistol hammer (which is in work at the moment )
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Girardoni-style loading mech :P
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