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sprung ball valve hand cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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sprung ball valve hand cannon

Unread postAuthor: spudamine » Wed Jul 13, 2011 4:11 pm

This is a little something I felt like putting together as my main project at the moment is grinding me down a bit. This is a spare parts cannon with little or no planning or optimisation. I wanted to use the handle and custom T piece from another project which never got finished and I've never made a ball valve cannon before, plus adding a captive piston sounded fun as well, here she is:
Image
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there's a sneaky pressure gauge built into the base of the handle, recessed of course so as not to be damaged whilst pistol whipping the undead :lol:
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The cannon originally had a captive piston (copied from one of btb's creations) but despite functioning correctly it wasn't noticably quieter, I guess the sound of the piston hitting the fitting at the end of the barrel was just as loud as the expanding gas without it so I removed it and tried some saboted darts instead, here are the bolts for the cative piston, unfortunately I forgot to take a picture before firing:
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and here are the darts with sabots and pushers:
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And what they did to an old frying pan, fired at about 400psi:
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here's a video with some more detail and, of course, more damage.
[youtube]http://www.youtube.com/watch?v=izRvFkCbnTg[/youtube]
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Unread postAuthor: farmerboy32 » Wed Jul 13, 2011 4:22 pm

this is really awesome dude! i really like your clean trigger setup! keep the good work!
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Unread postAuthor: Gun Freak » Wed Jul 13, 2011 5:44 pm

That's a wicked little pistol. Captive bolt sounds cool too, you don't hear about those too much. Nice work!
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Unread postAuthor: Gaderelguitarist » Wed Jul 13, 2011 9:16 pm

Beautiful pistol. It definitely packs a punch based on the result of mixing it with a frying pan.

Spring operated ball valves have a sort of "flintlock" appeal. Combine the aesthetics of BTB's Old Shatterhand with your pistol and I'd have to give you a 10 out of 5.
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Re: sprung ball valve hand cannon

Unread postAuthor: jackssmirkingrevenge » Wed Jul 13, 2011 10:12 pm

Brilliant!

For a "spare parts" launcher it's miles ahead of what some people here achieve in their lifetime :)

Some details of your captive piston setup would be appreciated, perhaps we can figure out why it didn't work according to plan.

spudamine wrote:recessed of course so as not to be damaged whilst pistol whipping the undead :lol:


I knew it!

:D :D :D
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Unread postAuthor: daniel0663 » Wed Jul 13, 2011 11:27 pm

Awesome ! looks clean for a spring loaded air gun.
Loving the gauge.... oh ! and the laser....
and the custom grip. I love everything about it... :lol:

best gun I've seen in a while ..
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Unread postAuthor: Doctore » Thu Jul 14, 2011 9:25 am

Nice airgun!!!
Best spring airgun I have seen so far. :D
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Unread postAuthor: saefroch » Thu Jul 14, 2011 2:40 pm

Love the captive sabot idea. And the damage to the frying pan is rather terrifying but... is that frying pan copper?
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Unread postAuthor: spudamine » Thu Jul 14, 2011 4:12 pm

Some details of your captive piston setup would be appreciated, perhaps we can figure out why it didn't work according to plan.

Well it's fairly simple really, aluminium piston in the barrel with a floating o-ring seal (a spare from my 2-stage pump). this is held in by a solder fitting on the end of the barrel (only shown in the video not the pictures) which is reinforced with a few bolts. It was definitely trapping the muzzle blast as there was a slow hiss after firing as the gun slowly emptied pressure, but it still sounded quite loud. I should probably have used a lighter piston, I think BTB used a rubber one, even though mine was quite lightweight it was still hitting the 'end stop' with enough force to completely mash up the spring after a few shots and also deform the piston enough that it had to be reground to slide in the barrel smoothly. Accuracy of the bolts was also quite woeful, probably due to a fairly poor effort at a whisker biscuit on the end of the barrel, so I got rid of it and used darts instead.

Love the captive sabot idea. And the damage to the frying pan is rather terrifying but... is that frying pan copper?


nah, just aluminium, I wouldn't waste a copper pan :)
That's actually the second one I've shot up in my spudding career, they just seem to annoy me.
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 15, 2011 1:41 am

Have you considered an air cushion?

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Unread postAuthor: Gun Freak » Fri Jul 15, 2011 10:01 am

Those all seem impractical and/or very difficult to make 8)
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Unread postAuthor: Technician1002 » Fri Jul 15, 2011 10:28 am

Aluminum frying pans are soft. A woman with bare hands can roll one up to save space.
[youtube]http://www.youtube.com/watch?v=FJug16NlqPk[/youtube]

How well does it perform with a stainless steel pan or cast iron? :D
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Unread postAuthor: Sch120PVC » Fri Jul 15, 2011 1:56 pm

Great gun mate.......i checked out your other spudgunning videos on youtube and you seem to me following spudgunning more than just a hobby! all your designs are beautifully machined! Keep it up, and you really should be proud of this little beast!
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Unread postAuthor: spudamine » Fri Jul 15, 2011 4:31 pm

Have you considered an air cushion?

that should be quieter, the top one would look quite cool firing and wouldn't waste any barrel length, would be a sod to make though.

How well does it perform with a stainless steel pan or cast iron?

Tec, one of my key strategies for not getting a bolt in my head is to match a hard projectile with a softer target or vice versa so I think I will keep my cast iron pans where they belong for now thankyou :lol:

Great gun mate.......i checked out your other spudgunning videos on youtube and you seem to me following spudgunning more than just a hobby! all your designs are beautifully machined! Keep it up, and you really should be proud of this little beast!


Thankyou, not strictly machined but a lot can be achieved with a drill press and a good saw. sadly my pillar drill is on it's last legs after about 5 years of constant abuse being used as a crude lathe, mill and sander. Maybe I should replace it with a mill...
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Unread postAuthor: Brian the brain » Sat Jul 16, 2011 4:14 am

I think BTB used a rubber one


yep... :D

With a bolt through the center for the arrow to hang onto and stay centered.
Some thick rubber hose would do the trick.

both lightweight and silent.
And it eliminates the need for a bumper..

Thanks for trying it out though!

Very clean build!
If you could flip the action on that BV it would be more like cocking a flintlock..

If that's your thing... :wink:
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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