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New Coaxial Piston 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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Do you like coaxial cannons?

Yes
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Total votes : 16
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New Coaxial Piston Cannon

Unread postAuthor: spudkpi » Mon Jul 28, 2008 10:46 pm

This is my second cannon actually submitted to the site, however it is one of many that I have built. It is a coaxial piston cannon with a 2'' chamber and 1/2'' barrel and seals like a dream using a 1.5'' end cap and a spring. I will soon post pictures of the inside because I machined the barrel stabilizer and I am proud of it lol. The pilot valve is a 1'' sprinkler valve thats modded and I will soon be putting two handles on it made out of 2'' tees and dropping a hose down from the sprinkler valve so i can put the blowgun on one of the handles. I would eventually love to get some regulated co2 onboard this baby but dont have enough money :). I have only taken it up to 80 psi and it does not leak one bit and I have only shot AA batteries because I cant think or find any other ammo right now. Let me know what you think and please please make any suggestions. And the video is also pretty cool. Questions welcome!



[youtube]http://youtube.com/watch?v=t5Bnbye1kkI[/youtube]
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Attachments
0727080012a.jpg
Closeup of valve end
fghg.jpg
Full view of gun
0729082010.jpg
New Layout with two handles and blowgun drop down for trigger
0729082010a.jpg
Closeup of back end
0729082011.jpg
I will be in-seeting the blowgun inside of the back handle and capping it off. I need to adjust the hose for it and dremel out the pvc slot
Last edited by spudkpi on Tue Jul 29, 2008 7:47 pm, edited 1 time in total.
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Unread postAuthor: Gippeto » Tue Jul 29, 2008 12:14 am

I like the co-ax!

Lot's of differential to open the piston quickly, and lots of pilot valve flow to avoid recompression. :)

Personally, I'd ditch the spring, you don't need it.

But hey, it seems to work well, and if you're happy with it, why would you care what I think? :)

Good job!
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Unread postAuthor: Atlantis » Tue Jul 29, 2008 12:31 am

Nice clean cannon, I haven't seen a coaxial thats filled from the chamber side before. So what's with the video anyways, 1:10 of you lighting something on fire, then 2 minutes of slow motion burning......what did you even shoot at?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 29, 2008 12:38 am

Atlantis wrote:So what's with the video anyways, 1:10 of you lighting something on fire, then 2 minutes of slow motion burning......what did you even shoot at?


It's written in the video, a jar full of gasoline. Though I agree, half naked youngsters in slow motion are of considerably less interest to the majority of this forum than explosions, I would have edited the first bit out personally.

As to the cannon, good job, and more damage!
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Unread postAuthor: Atlantis » Tue Jul 29, 2008 1:11 am

Ah didn't notice it in the corner in tiny front combined with red/green colorblindness, way to look out for the viewer. Try cutting open a can of Sterno, lighting that and shooting it, I wonder if you'll get a more "jet" like flame following the projectile. You should add a scope and use it for Nerf darts, just don'y hurt anyone.

P.S. Clothes are great protection against burns.
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Unread postAuthor: jonnyboy » Tue Jul 29, 2008 1:07 pm

Nice cannon I'm not usually a fan of co ax's. How about a better damage video. Shooting a glass jar doesn't show much. It's like demonstrating the force of a missile by shooting through paper. Perhaps some plywood. :twisted: :twisted:

BTW
Whats up with the whole video in slo mo. you should just get the shot next time.
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 29, 2008 1:09 pm

And, since it's apparently a fetish of mine, nice foot :roll: :P
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Unread postAuthor: spudkpi » Tue Jul 29, 2008 6:38 pm

Atlantis wrote:Nice clean cannon, I haven't seen a coaxial thats filled from the chamber side before. So what's with the video anyways, 1:10 of you lighting something on fire, then 2 minutes of slow motion burning......what did you even shoot at?


Watch the video it explains everything...
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Unread postAuthor: spudkpi » Tue Jul 29, 2008 6:40 pm

okay okay okay sorry everyone about the video... I just got a new cell phone that records at 120 frames per second so i decided to test it out. And yes that is me with my shirt off who cares lol.... ever been to a pool in your lives? Haha anyways thanks for the positives...
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Unread postAuthor: kostaki » Tue Jul 29, 2008 6:49 pm

I think its really nice and has awsome power you should go to 150 depending on the pressure rating on your sprinkler valve.
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Unread postAuthor: Mr.Sandman » Tue Jul 29, 2008 6:59 pm

im starting to see more people use a sprinkler valve as a pilot. i think the first one i saw was that mini piston gun v2
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