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Flintlock style pistol with spring loaded ball 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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Flintlock style pistol with spring loaded ball valve

Unread postAuthor: farcticox1 » Tue Jul 10, 2018 4:34 pm

Started to build a flintlock stylie pistol with a spring loaded ball valve.

PDRAG_left.jpg


1/4" threaded ball valve with 1/4" ID barrel and 3/4" stainless tubeing for the chamber. I drilled a hole in the side of the valve as a loading point, then realised that some air would leak out as the ball rotates, was thinking the BB might shoot out the top instead of down the barrel, but it actually works. Put a spring on it and 100psi for some test shots, it was pretty impressive :D Locking and release mechanism will be the fun bit :idea:
001 (3).jpg

001 (2).jpg

001 (1).jpg
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Last edited by farcticox1 on Sat Aug 11, 2018 4:09 pm, edited 1 time in total.
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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Tue Jul 10, 2018 5:50 pm

Looks great :) How much air pressure do you think you use? How many cm3 of capacity is the air chamber? So what system is filled with air? :roll:
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Tue Jul 10, 2018 6:13 pm

I can take it up to 160psi with my compressor, I might try a schrader valve as I have a shock pump that goes up to 300psi. I think about 70cm3 in the 3/4" chamber, 19mmD x 250mm long. There is a 1/8"npt thread at the front of the chamber, you can't see it in the picture.
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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Tue Jul 10, 2018 6:15 pm

Go ahead with the project. I would like to see shoot that thing.
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Tue Jul 10, 2018 6:21 pm

Yes, this one is going to be a bit of fun. :bounce:

This is the fill port, and the test spring.

02.jpg
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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Tue Jul 10, 2018 7:56 pm

It looks good !! Your old pistol has inspired me to conclude a small, non-autonomous hybrid pistol that I had unfinished, just to test it. I already put what I built in a new post :bounce:
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Wed Jul 11, 2018 4:36 am

ooooh, this looks nice

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Re: Spring loaded ball valve

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Re: Spring loaded ball valve

Unread postAuthor: jackssmirkingrevenge » Thu Jul 12, 2018 5:41 am

Looking good! Spring loaded ball valves are definitely a fast and relatively easy solution for small calibers that is often overlooked.
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Thu Jul 12, 2018 5:49 pm

Started to shape the grip from 10mm gold anodized aluminium. That was 1 hours work :roll:
03 (1).jpg

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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Thu Jul 12, 2018 7:09 pm

I see that you have come a long way with this old gun. In good time. Be careful to see the work completed.
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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Thu Jul 12, 2018 7:41 pm

Inspiration for you :D
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Fri Jul 13, 2018 6:38 pm

Taking shape

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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Tue Jul 17, 2018 6:00 pm

Worked out a Rube Goldberg set up to lock and release the valve. :idea:

lock.jpg


Got a schrader tire chuck to mount on the bench and charge it for each shot, if the valve doesn't leak :?

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Re: Spring loaded ball valve

Unread postAuthor: hectmarr » Wed Jul 18, 2018 5:51 pm

Looks good. I hope your valve does not have air leaks. Mine always loses a little air :x
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Re: Spring loaded ball valve

Unread postAuthor: farcticox1 » Thu Jul 19, 2018 7:03 am

Drilling a hole in one side won't help as it now only has one seal face instead of two, but if it works the reload will be pretty nice :D unless I make some kind of sealed cap that covers the hole and braze it on to the valve :idea:
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