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auto-recock no tool 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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auto-recock no tool hammer valve?

Unread postAuthor: mopherman » Thu Nov 15, 2007 6:06 pm

I had an idea that came froma story about accidentaly actuation a piston with a ramrod. why not just have a washer/bolt pistonplugging the end of a high volume high pressure chamber and whack it open? You would put the outlet to the barrel behind the piston so the air pressure would recock it. heres a pic
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Unread postAuthor: LikimysCrotchus5 » Thu Nov 15, 2007 6:10 pm

Seems logical. But you dont know for sure until you try it :)
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Unread postAuthor: mopherman » Thu Nov 15, 2007 6:13 pm

thats what i plan to do. as soon as i scrape some cash together.I also plan on equiping it with a jsr style blow-forward breach for a nice ROF.
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Unread postAuthor: LikimysCrotchus5 » Thu Nov 15, 2007 6:15 pm

And im pretty sure this could probably easily be used as a semi auto?
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Unread postAuthor: mopherman » Thu Nov 15, 2007 6:16 pm

@LMC 3/8 slingshot ammo. Gets me all exited just thinking about it
woops, thought you asked for my ammo choice. :lol: I was planning on semi auto
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Unread postAuthor: Hailfire753 » Thu Nov 15, 2007 7:14 pm

Sweet idea! There has been a whole lot of semi-auto ideas recently, but no one has tested them yet. Do you think your design would cycle fast enough for paintball use (6-10 bps)?

Please Test! ...or I will test it if I have the time and money.
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Last edited by Hailfire753 on Thu Nov 22, 2007 8:24 am, edited 1 time in total.
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Unread postAuthor: mopherman » Thu Nov 15, 2007 7:23 pm

Hailfire753 wrote:Sweet idea! There has been a whole lot of semi-auto ideas recently, but no one has tested them yet. Do you think your design would cycle fast enough for paintball use (6-10 bps)?

Please Test! ...or I will test it it Ihave the time and money.

yes, I think it would cycle for semi or even full auto. I do plan on testing this. The only problem I forsee is the spring not e being strong enough to open the valve at higher pressures. This is why I'm limiting the sealing washer to 1/2 in diameter.
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Unread postAuthor: Hawkeye » Thu Nov 15, 2007 7:41 pm

The striker will shut the air off to the barrel the way you have it and the air will also blast out the hole for the sear. You need a longer pin on the valve and the sear needs to be further up the slide tube(ahead of the barrel outlet).

This isn't a new idea though. It's a standard valve type. You need very high pressure to make this worthwhile.
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Unread postAuthor: mopherman » Thu Nov 15, 2007 8:13 pm

Hawkeye wrote:The striker will shut the air off to the barrel the way you have it and the air will also blast out the hole for the sear. You need a longer pin on the valve and the sear needs to be further up the slide tube(ahead of the barrel outlet).

This isn't a new idea though. It's a standard valve type. You need very high pressure to make this worthwhile.

Thanks for the tips. wouldnt not need so much pressure because I used 1/2 diameter outlet? I think thats much bigger than most pbguns.

I understand that this isnt a new valve. I just wanted a multi-shot valve that required no lathe. Btw,I plan on making it so the striker blocks off the sear hole. Thanks for the input
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Unread postAuthor: Hawkeye » Thu Nov 15, 2007 8:43 pm

Check out the piston/hammer valve combo topic.
That is another similar idea where the piston functions as the hammer and theoretically resets immediately. Jack did a pretty good drawing for the principle.
For your idea you could notch the striker in the middle rather than having it caught on the end.
A potential striker that requires little machining (polishing)is a drill bit extension. I have bought a short one that slides in half inch copper piping. It could be set up so that it could be cocked manually initially.
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Unread postAuthor: mopherman » Thu Nov 15, 2007 8:48 pm

Hawkeye wrote:Check out the piston/hammer valve combo topic.
That is another similar idea where the piston functions as the hammer and theoretically resets immediately. Jack did a pretty good drawing for the principle.
For your idea you could notch the striker in the middle rather than having it caught on the end.
A potential striker that requires little machining (polishing)is a drill bit extension. I have bought a short one that slides in half inch copper piping. It could be set up so that it could be cocked manually initially.


Are you saying that i should extend the sear further inward into the pipe,or that i should make a channel in the piston for it?
I was planning on making a striker out of a brass craft tube that fit nicely in the pipe. I would fill it with jbweld or similar.
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Unread postAuthor: VH_man » Thu Nov 15, 2007 9:21 pm

YES!!! this works just like an Air Hogs engine............ exept bigger. i might make one of these too because it doesnt need perfect seals.......
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Unread postAuthor: mopherman » Thu Nov 15, 2007 9:23 pm

I would recommend that you wait for me to skrew up on it.then you can get first hand advise
well, we'll find out whenever i get some funds
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Last edited by mopherman on Thu Nov 15, 2007 9:29 pm, edited 1 time in total.
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Unread postAuthor: VH_man » Thu Nov 15, 2007 9:25 pm

actually, the only way i dont think this would work is if the piston sealed to tightly.......... the presure would build up and the spring wouldnt make the hammer move fast enough............
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Unread postAuthor: JDP12 » Thu Nov 15, 2007 9:25 pm

not a bad idea, i'd be interested to see how it works out, good luck.
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