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This is my most recent cannon. It shoots 1/4" ball bearings from a brass barrel that fits them perfectly. It is somewhat coaxial I guess as you can see from the pictures. It uses another breech-loading ball-valve mechanism like my last pneumatic.
It uses a 1/4" QEV actuated by a blowgun. The filling valve is a shrader. At 100 PSI it shot through many layers of foam-core board and lodged itself deep in a wall board. I have yet to test its range due to lack of space. Here's the pictures:
Comments, Suggestions, and Criticism is welcome!
tha ball valve loading system is awesome! who would of thought to use that. nice gun btw.
"True Terror is to wake up one morning and discover that your high school class is running the country" - Kurt Vonnegut Jr.
"America is all about speed. Hot, nasty, bad-ass
speed." - Eleanor Roosevelt
Thats a nice loking cannon.
BTW: specialist, look at the Wasp M2k I think it's called, that has the ball valve loading system to... I'm too lazy to find the link right now...
VH was awesome!!
C02 Jetpack (CIIJ)
.177 cal. piston rifle
Flipping sweet cannon! I love all metal cannons, they my favourite!
I take it you use a compressor, right?
A truly amazing gun... only one question, why did you use that short piece of hose instead of just the metal pipe???
really good quote/phrase here
I really like the semi-coaxial style, how you used the space around the barrel for additional chamber volume.
How did you seal the barrel into the larger pipe? Epoxy, JBweld, something crazy with fittings?
Did you mod the blowgun? I assume so, though I doubt it matters for piloting a 1/4" QEV (You could probably pilot that valve with a pinhead...).
What's the lowest-rated part? The hose, I assume?
I bet the performance is great with those teeny ball bearings. I'd try making some darts for it (though you'd have to muzzle load them).
The hose at the bottom is the only part I don't like. It'd be nice if you could figure out a way around that, but I see the problem: those fittings don't line up well enough to use a nipple there.
I'd consider trying to bend a fitting or pipe (maybe using copper, it's easier to bend...) or using JBWeld to make a little angle adapter (I've used JBWeld in some pretty high-pressure, high-stress applications before and have always been impressed with the results).
Since it looks kind of like an SMG already, a mock silencer (that'd fit over the last few inches of the barrel, making the whole barrel look much bigger) and a shoulder strap would be cool accessories
Thanks for the compliments guys!
I don't actually have a compresser at the moment so I use a 12gram CO2 to tire valve device from the bicycle shop near me.
I used the piece of hose because I can't solder well enough yet and try making a square with 4 threaded elbows- it cannot be done.
EDIT: you beat me to the post:
Anyway, I used epoxy to fill/secure the gap around the barrel. I originally designed it to be all copper plus a brass barrel but the whole learning to solder got in the way. I'm still working on that though. Also, no, the blowgun isn't modded.
I was thinking about your "making a square with 4 threaded elbows" problem... what about compression fittings? It seems to me that you could use two NPT-to-compression elbows, and a nipple with compression fittings on the ends between them (hope that makes sense).
Otherwise, I'd get creative with some JBweld or high-strength epoxy.
Awesome gun. Hope you can figure out a way around that hose, because that's the only thing holding it back from being "grade A".
I particularly like the ballvalve breech
I don't think it is possible without a special fitting to replace the hose with metal.
Threaded fittings can't make a square unless you have a swivel fitting in there somewhere or perhaps a compression section which would cost quite a bit more.
Give me a vice, and a hammer. I can make them fit.
I really like the cannon. Great idea for the ball valve. how long did it take you to make? I'm not exactly sure how qev's work but isn't the chamber all before the valve?
Pete: Yeah, I probably could use compression fittings, wish I'd thought of it.
crazymoron010: The chamber is all before the valve as far as air flow goes, but not as far as physical placement goes. The QEV is basically just a really well designed barrel-sealing piston valve.
Thanks for all the compliments and suggestions guys!
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