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hammer for a 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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hammer for a hammer valve

Unread postAuthor: maverik94 » Tue Nov 03, 2009 2:08 pm

Hey Y'all, I'm working on a .25 cal. multishot rifle. It's a PCP gun, and it uses a hammer valve as the one and only valve in the gun. Here's a picture:
Image
Anyway, I need a springloaded hammer that hits the threaded rod on the right. I have experimented using a tube and a metal rod that's springloaded and it worked, but there's no way to really cock and fire it reliably. I have tried to figure out a good way to do this for a while, I have looked at diagrams of commercial pcp guns, and can't figure out how they do it. Does anybody have a way of doing this? I have done a lot of searching and I have not been able to find anything on this. Thanks!
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Unread postAuthor: cannon monkey » Tue Nov 03, 2009 2:13 pm

ur image not working
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 03, 2009 2:13 pm

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Unread postAuthor: POLAND_SPUD » Tue Nov 03, 2009 2:17 pm

what about the kind of valve used on SHARP innova ?
I am almost 100% sure it's not a hammer valve
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Unread postAuthor: maverik94 » Tue Nov 03, 2009 2:21 pm

The image works for me.... And thanks for the link jsr, but how is the hammer cocked?
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Unread postAuthor: MRR » Tue Nov 03, 2009 2:35 pm

Click on the image. It's a flash animation and explained in detail.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 03, 2009 2:39 pm

As above.

Does this help?

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Unread postAuthor: Gippeto » Tue Nov 03, 2009 2:44 pm

Please note the "bolt" in the slot. It's attached to the hammer. :)
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Unread postAuthor: maverik94 » Tue Nov 03, 2009 2:50 pm

AHHHHHHHHHH Ok, I dodn't realize you could click on the words! Wow, that makes me feel stupid. Anyway, I get it. Thanks a lot. I will resond when I try this out. Thanks!
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 03, 2009 3:06 pm

POLAND_SPUD wrote:what about the kind of valve used on SHARP innova ?
I am almost 100% sure it's not a hammer valve


Kinda looks like some sort of exhaust valve dunnit?

Image

btw "ur image not working" for me either...
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Unread postAuthor: maverik94 » Tue Nov 03, 2009 4:30 pm

Ok, Success at last!!!!!! I built the bolt cocking mech and the trigger/sear mech just now. I made the trigger out of some heavy metal and cut it to shape with a cut-off-wheel, I made the bolt with some stell brakeline and some treaded rod and the help of the cut-off-wheel and a drill. It works like a charm. Thanks for all your help. By the way, the image is not working for me anymore either, even though it was earlier. Anyway, thats not important because Ive got this working. The only bad thing is when I was testing the sear, I forgot to block the hammer and it went flying, hit a light shade, denting it()Yeah, I'm using a powerful spring), and then fell somewhere and I can't find it....damn....
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Unread postAuthor: POLAND_SPUD » Tue Nov 03, 2009 5:32 pm

hmmm
well I found this
Image

apparently, it's just a chamber sealing piston valve with a sear (mechanical actuation)
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Unread postAuthor: maverik94 » Tue Nov 03, 2009 7:12 pm

Ok, It's all good, I made a new hammer seeing as I couldn't find the old one it it works just fine. Thanks for all your help, you were very...ermmmm....helpfull!!!!!!!!!!!!!!!!!!
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Give me a lever long enough, and a fulcrum on which to place it and I shall move the world.
–Archimedes
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–Carl Denham

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Unread postAuthor: jackssmirkingrevenge » Tue Nov 03, 2009 10:37 pm

POLAND_SPUD wrote:apparently, it's just a chamber sealing piston valve with a sear (mechanical actuation)


Is it just me or were we flicking through the same long Russian thread :D
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Unread postAuthor: inonickname » Wed Nov 04, 2009 6:45 am

I'd like to see your solution for the sear. I'm facing a similar problem now, with incorporating a sear (for a hammer valve) into a stock. I'm thinking a steel pin (spring loaded to remain UP) which restrains the hammer, which passes directly through the stock. A lever attached to the trigger can then be used to actuate it.

Lets see it then, good work from what we hear :)
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