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Semi automatic ideas?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Semi automatic ideas?

Unread postAuthor: farcticox1 » Tue Jun 14, 2016 7:59 pm

Anybody got any ideas on a fully pneumatic powered semi automatic bolt action set up.

I'm thinking pulling the trigger switches a pilot valve to send air down the barrel, pulling the trigger fully in, shuts of that air and triggers the reload cylinder ( bolt action ) so a secondary actuater on the trigger.
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Re: Semi automatic ideas?

Unread postAuthor: mobile chernobyl » Tue Jun 14, 2016 8:49 pm

Check out the 'Autococker' paintball mechanism:
http://www.zdspb.com/media/tech/animati ... er_wgp.gif

Tons of other paintball based semi-automatic ideas here:
http://www.zdspb.com/tech/misc/animations.html
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Re: Semi automatic ideas?

Unread postAuthor: keks2033 » Wed Jun 15, 2016 3:33 pm

farcticox1 wrote:Anybody got any ideas on a fully pneumatic powered semi automatic bolt action set up.

I'm thinking pulling the trigger switches a pilot valve to send air down the barrel, pulling the trigger fully in, shuts of that air and triggers the reload cylinder ( bolt action ) so a secondary actuater on the trigger.

https://youtu.be/scfFZwgrd6U simple semi-automatic rifle with a piston valve. Shooting out of it: https://youtu.be/JiceOT515tI The piston valve makes it easy to semi-automatic rifles. On my channel there are several of these guns.
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Thu Jun 16, 2016 5:21 pm

Worked on the circuit a bit, going to get some parts and make a test set up of this.

Pulling trigger should operate main valve then operate the control valve after a short time set by restrictor, which shuts off main valve and opens breach to load 1 ball. Releasing trigger should reset valves ready to fire again.
On initial loading, before firing, 1st round can be loaded manually as breach cylinder is spring return, just like a real gun.


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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Thu Jun 16, 2016 7:55 pm

Tried it on Fluid Sim and it seems to work :shock:
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Re: Semi automatic ideas?

Unread postAuthor: Brian the brain » Fri Jun 17, 2016 2:09 pm

This was my idea...although it can be set to full auto aswell.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Mon Jun 27, 2016 5:30 pm

Made the skeleton for the grip and trigger mechanism

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Re: Semi automatic ideas?

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Re: Semi automatic ideas?

Unread postAuthor: Kensingt0n » Tue Jun 28, 2016 4:00 am

Nice work farcticox, looks like some clean work dude.
What tools did you use to make that whole mechanism?
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Tue Jun 28, 2016 4:18 pm

I have access to a decent drill press at work, apart from that all hand tools. The main plate is 10mm aluminum, it's a bit discolored as it was basically scrap metal left outside.
I have some nice 3/8 thick white nylon to finish the grip, other parts have arrived so lots more to do yet. The barrel is going to be 1/2' OD stainless seamless tubeing, the ID is 10.2mm so the ammo will be 10mm ball bearings.
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Re: Semi automatic ideas?

Unread postAuthor: cowscankill » Wed Jun 29, 2016 12:41 pm

Nice work so far!

Are you planning on making the valves or using premade? That one you have so far looks really slick.
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"Make everything as simple as possible, but not simpler." - Albert Einstein
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Wed Jun 29, 2016 3:42 pm

Just using off the shelf pilot air valves, I have a 3/8 port for the barrel and a 1/8 port for the pilot.

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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Wed Jun 29, 2016 5:35 pm

Just playing with layout, this looks interesting, the stock will be the main chamber. So what is a good chamber/barrel volume?

I have read 4:1, I should be able to achieve that easily.

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Re: Semi automatic ideas?

Unread postAuthor: Kensingt0n » Thu Jun 30, 2016 4:07 am

farcticox1 wrote:I have access to a decent drill press at work, apart from that all hand tools. The main plate is 10mm aluminum, it's a bit discolored as it was basically scrap metal left outside.
I have some nice 3/8 thick white nylon to finish the grip, other parts have arrived so lots more to do yet. The barrel is going to be 1/2' OD stainless seamless tubeing, the ID is 10.2mm so the ammo will be 10mm ball bearings.


Great craftsmanship mate, love how accomplished you feel when you achieve results like that.
Man, that ammo should chop anything it touches ;)
Sorry if you had already stated, but what were you planning on using as your chamber?
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Re: Semi automatic ideas?

Unread postAuthor: farcticox1 » Thu Jun 30, 2016 3:30 pm

I might fabricate it from stainless sheet if I need to get the volume, have Tig welder as well, or use tubing, haven't got that far yet.

Converted my main valve pilot to side entry pilot, found a nice 1/8' flush plug to fill the original hole, new hole is M5

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Re: Semi automatic ideas?

Unread postAuthor: Kensingt0n » Thu Jun 30, 2016 5:55 pm

Damn man, that's a mad idea for your pilot valve.
I really need to get some more tools myself, or just find a new job haha.
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