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trigger mecanism for hammer valve

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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trigger mecanism for hammer valve

Unread postAuthor: wyz2285 » Sat Aug 20, 2011 9:36 am

Hi everybody, I need a simple trigger mechanism for semi auto for hammer valves, thanks
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Last edited by wyz2285 on Sat Aug 20, 2011 10:28 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 20, 2011 10:13 am

This is how FX semi-auto airguns work ;)

Here's my Monsoon opened up:

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Unread postAuthor: wyz2285 » Sat Aug 20, 2011 10:28 am

I mean the trigger part, how does it re catch the hammer?
sorry that diagram was difficult to understand :oops:
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 20, 2011 10:54 am

Maybe the FX design is a little too complex, but surely you can find inspiration here?
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Unread postAuthor: wyz2285 » Sat Aug 20, 2011 1:48 pm

they are for single shots or electronic :(
may be I should just make one that I can recock the hammer and reload ammo in one single action
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 20, 2011 2:25 pm

Here's a basic diagram of how the FX Monsoon works, I've not shown the magazine for the sake of clarity.

The sequence is like this:

1) blue trigger is pulled, releasing the red hammer

2) hammer its the yellow valve stem releasing a burs of air

3) the air fires the projectile

4) when the projectile passes barrel porting, air pushes the green piston back

5) the piston recocks the hammer, which gives semi or full auto depending on whether the trigger is still held or not
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Unread postAuthor: farmerboy32 » Sat Aug 20, 2011 2:37 pm

that is a great diagram there jack! :D
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Unread postAuthor: wyz2285 » Sat Aug 20, 2011 3:32 pm

looks like a lot of work :? but i will try :)
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 20, 2011 3:46 pm

Not as hard as you think. Imagine adding a silencer, but the back wall can move. Connect that to your hammer and you're done.

The important think is to have good enough porting flow and a large low priction piston for the air to push on.
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Unread postAuthor: Gun Freak » Sat Aug 20, 2011 4:50 pm

I'm having a hard time believing that the barrel piston will travel far back enough, given the small time the air has to act on it.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 20, 2011 4:59 pm

Gun Freak wrote:I'm having a hard time believing that the barrel piston will travel far back enough, given the small time the air has to act on it.


Works for the FX Monsoon and Revolution, though granted for a 3000-1500 psi range. It certainly won't work for a low powered launchers. Moving the porting towards the breech will certainly improve chances of success.

Also consider that the Monsoon has one tough hammer spring, takes a lot of effort to cock it, a lower pressure launcher has much lower cocking requirements.

Some time ago I figured it could be adapted as a shell ejecting reload mechanism:

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Unread postAuthor: Crna Legija » Sat Aug 20, 2011 10:27 pm

idk if it would work but i would like to try make it if i can get the right parts.
It's basically a crosman 2240.
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Unread postAuthor: wyz2285 » Sun Aug 21, 2011 4:29 am

Crna Legija wrote:It's basically a crosman 2240.

I know how a single shot trigger works :roll:
My problem is I can´t release the trigger fast enough to catch the recocked hammer and the hammer hits the valve again, so it´s more like a full auto than semi.
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Unread postAuthor: Zeus » Sun Aug 21, 2011 4:37 am

What's wrong with a double action hammer? If it's a heavy hammer, and the spring doesn't impinge on the hammer for the last few degrees I don't see why not.

Edit: It shouldn't cause fully automatic fire, if the hammer bounces once it hits the valve, I can't see it having enough force to trigger it again.
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Last edited by Zeus on Sun Aug 21, 2011 5:21 am, edited 1 time in total.
/sarcasm, /hyperbole
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Unread postAuthor: wyz2285 » Sun Aug 21, 2011 4:44 am

would you like to see your gun firing in full auto when it was designed to be a semi auto :roll:
I want semi auto because the accuracy is relatively better than a full auto
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