help with semi automatic airgun

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Nikolai1939
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Wed Jan 05, 2022 8:54 pm

Hello there. I'm planning to make a semi automatic air carbine, but I'm not familiar with QEVs and air cylinder pistons, so heres two questions:

1- can I use this style of blow gun to divert pressure to the pneumatic pistol and thus push it forward? Or can I only do it with a solenoid 3 way valve?
2- can I connect the reservoir directly into the blowgun handle like in example A by closing off the QEV air entry (marked as 1) and putting a shredder valve at the back of the reservoir to fill it up from there? Or would it need to be done like example B?
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farcticox1
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Sat Jan 08, 2022 8:18 am

I did the piston thing with my 10mm, it ran off 2 valves, was pretty complicated for what it did but worked great.
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farcticox1
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Sat Jan 08, 2022 8:24 am

This turned into a semiauto by making a simple spring loaded piston, I'll find some pictures. If I was going to build another semiauto I would do this again.
viewtopic.php?f=29&t=26658
This is how the piston works, the block is aluminum.
piston.jpg
piston.jpg (11.86 KiB) Viewed 6943 times
I made it from a piece of nylon and a bolt
20200822_190607.jpg
20200822_190607.jpg (19.39 KiB) Viewed 6943 times
semiauto (1).jpg
semiauto (2).jpg
FerdBlu
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Tue Feb 01, 2022 4:40 am

You may get away with no bolt at all. I have done that multiple times. Just seal the magazine with the barrel so that no air can escape. This makes the whole thing more powerful and simpler
quinn whitsitt
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Tue Feb 13, 2024 11:52 am

i whould recomend placing one way valve fasing oposite directions with a tee in the middle with a one way valve at the bottom of the tee facing down into a air hose adapter with an air house on the adapter that feed back into the air tank with a nother one way valve that faces towards the air tank with this addition you should be able to save most of the air note though that in order for this system to work it should be reltivle fast and the faster sed projectile goes the faster the cylic rate whill be
quinn whitsitt
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Thu Feb 15, 2024 11:58 am

nice job everyone
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