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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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Unread postAuthor: jhalek90 » Sun Aug 21, 2011 8:11 am

I recently took this design:
Image
and turned it into this:
Image

This is just the fire control mec. The hammer is a cylinder, of steel, with a spring behind. It rides in a piece of copper tube, and hits a blowgun (300psi).
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Unread postAuthor: wyz2285 » Sun Aug 21, 2011 10:33 am

is that a trigger :scratch: and does that work for semi auto?
I feel stupid because I didn´t understand how that mechanism is going to work :oops:
can you show me the internals of your gun? thx
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Unread postAuthor: Gippeto » Sun Aug 21, 2011 10:35 am

Want semi auto eh. :)

Two piece trigger/sear assembly is gonna be a bear to make work...if you find a way to do it.

You need a sear disconnect. Couple examples...will need some modification of your striker design to work.

http://www.bushmaster.com/anatomy_bushmaster.asp

Simplest one I've come across http://www.homegunsmith.com/cgi-bin/ib3 ... =3;t=27047

If you cannot view it, let me know and I'll transfer links to the pics.
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Unread postAuthor: ramses » Sun Aug 21, 2011 11:25 am

The part that will catch the hammer on its way back with the trigger still pulled is called the disconnector. It really is a bear to get right, since if you make it the wrong size, it will either not catch the hammer on the way back, or release the hammer upon letting go of the trigger before the "normal" trigger sear is there to catch it.

Image
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Unread postAuthor: wyz2285 » Sun Aug 21, 2011 1:09 pm

@Gippeto
it´s better to be pictures, I can not open them :(
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Unread postAuthor: Gippeto » Sun Aug 21, 2011 1:29 pm

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Unread postAuthor: wyz2285 » Sun Aug 21, 2011 2:31 pm

that looks like a single action trigger, does the striker goes back to it´s initial position by it self?
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Unread postAuthor: ramses » Sun Aug 21, 2011 3:10 pm

The ar 15 is a single action trigger. It is put into its cocked position every time by the bolt. The bolt is either moved backward by the charging handle (cocking the gun manually) or by the recoiling bolt as it moves back to chamber another round.
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Unread postAuthor: wyz2285 » Mon Aug 22, 2011 3:52 am

ah so it´s like a trigger from a gas blowback pistols...
it won´t work for me unless I radically change the gun`s design but it´s already half done :?
And looks like the trigger+striker of a revolver it´s just what i´m looking for :) but I didn´t find a clear diagram of how it works. can anybody show me one? thx
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Unread postAuthor: Gippeto » Mon Aug 22, 2011 9:22 am

Try google images...."single action trigger mechanism"
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Unread postAuthor: ramses » Mon Aug 22, 2011 10:16 am

Gippeto wrote:Try google images...."single action trigger mechanism"


I think he wants double action, but the same logic applies. :D
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Unread postAuthor: wyz2285 » Mon Aug 22, 2011 2:28 pm

I tried, only found complex and unreadable diagrams :evil:
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Unread postAuthor: Zeus » Mon Aug 22, 2011 5:02 pm

wyz2285 wrote:I tried, only found complex and unreadable diagrams :evil:


I'm afraid that's firearms for you. Double action isn't too simple, all my books only have relatively complex designs. Out of my ~2.5GB of related files, I don't have any on double action hammers.

JSR, Gippeto, help please?

Single action is criminally easy to make, if you can live with having to cock a hammer for each shot until you can make a good double action trigger. It'll get you shooting quicker anyway.

And I'll try and simplify the two DAO mechs I have.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 22, 2011 5:08 pm

wyz2285 wrote:And looks like the trigger+striker of a revolver it´s just what i´m looking for :) but I didn´t find a clear diagram of how it works. can anybody show me one? thx


Here.

Click on the trigger and make it work ;)
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Unread postAuthor: saefroch » Mon Aug 22, 2011 6:23 pm

In that simulation, the trigger passes through the hammer when it recocks. Would it sill work as drawn?
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