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3/4" exhaust valve 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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3/4" exhaust valve cannon

Unread postAuthor: jackssmirkingrevenge » Tue Apr 03, 2007 12:31 am

I built this last year, one of the most powerful I've ever built using my unique (as far as I've found so far online) construction technique featuring high-strength epoxy as opposed to standard fittings. It's got a 34" barrel and is filled/fired through the same schrader valve. The reason I can do this and still get great performance is the tiny pilot volume, as the piston can only move back a little more than 1/8" (approximately 25% of the barrel diameter and all that is neccessary for maximum flow). The cast epoxy piston is also lightweight, a near perfect fit and very low friction.

For more detailed information on using epoxy, check out the how-tos here and here.

The beast:

Image


A diagram of the breech end internals:

Image


I had a lot of fun with this particular creation, here's the damage videos.

cell phone shot with a marble:

[youtube]http://www.youtube.com/watch?v=x1THyRu3AAA[/youtube]


and the bits I managed to recover:

Image


coffee can filled with water shot with a marble:

[youtube]http://www.youtube.com/watch?v=h9JAvxhnWr4[/youtube]

entry/exit holes:

Image


coffee can filled with water shot with multiple lead BBs:

[youtube]http://www.youtube.com/watch?v=Fy-JuS5MhNE[/youtube]


coffee can shot with a whiteboard marker:

[youtube]http://www.youtube.com/watch?v=68QXh9dOyYc[/youtube]


computer mouse shot with a marble:

[youtube]http://www.youtube.com/watch?v=P8Ne2E6qR4U[/youtube]


computer speaker shot with a marble:

[youtube]http://www.youtube.com/watch?v=MaEZoiwfJmE[/youtube]


flatbed scanner shot with a marble:

[youtube]http://www.youtube.com/watch?v=TpCy7o0zp5s[/youtube]


electric kettle filled with water shot with a marble:

[youtube]http://www.youtube.com/watch?v=JgTsMscv_0Y[/youtube]


diving mask shot with a marble:

[youtube]http://www.youtube.com/watch?v=PllSF-j-cQI[/youtube]


and last but not least, xmas angel with a head full of red paint :D

[youtube]http://www.youtube.com/watch?v=O749bNirBX0[/youtube]
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Last edited by jackssmirkingrevenge on Sun Aug 12, 2007 1:57 am, edited 4 times in total.
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Unread postAuthor: experament-u2 » Tue Apr 03, 2007 12:57 am

that is a great idea and desgin im sure it will inspire other people including me

and lots of good videos :lol:
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Unread postAuthor: shud_b_rite » Tue Apr 03, 2007 3:24 am

Awesome video's. That cannon is super powerful. Any idea what fps it shoots at?
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 03, 2007 3:34 am

I don't have the facility to chrono projectiles over 6mm in diameter, however according to GGDT when pressurised to 110 psi it fires a 10 gram glass marble at approximately 480 feet per second.
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Unread postAuthor: mopherman » Thu Apr 05, 2007 10:06 am

your pics are busted. i want to see em so plz fix
where did you get your valve?
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Unread postAuthor: Brooner115 » Thu Apr 05, 2007 5:30 pm

ya man i cant see the cannon all i see are the things getting destroyed by the cannon(that i cant see) :(

please fix because it looks like a beast from the vids :roll:
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Unread postAuthor: integral » Fri Apr 06, 2007 12:27 am

lol that xmas deco cracked me up man... brain matter all over the box!
gotta find a load of old toys to fill with red paint :D
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 06, 2007 2:11 am

integral wrote:lol that xmas deco cracked me up man... brain matter all over the box!
gotta find a load of old toys to fill with red paint :D


if you liked that, you'll love my website :D

Here's the pics in the original post, don't know what's up with photobucket :?
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Attachments
cannon.jpg
3/4" exhaust valve pneumatic left view
cannon.jpg (29.38 KiB) Viewed 6266 times
quarterinch.JPG
breech internals diagram
quarterinch.JPG (38.58 KiB) Viewed 6265 times
canholes2.jpg
entry/exit holes in coffee tin
canholes2.jpg (28.37 KiB) Viewed 6265 times
cellbits.JPG
cellphone fragments
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Unread postAuthor: integral » Fri Apr 06, 2007 3:34 am

omg hahahahahaha that site is the shiz!
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Unread postAuthor: A-98 » Mon Apr 09, 2007 6:31 pm

yup, you are jesus.

im suprised i hadnt found this one, given that im almost always on. it appeared in the random cannon area.

i think i might hae to borrow this epoxy idea, but i might have just found a machinist that could help with PVC.

this is one of the most powerfull cannons i have ever seen for its size, and it has inspired me! im going to make a piston gun if its the last thing i do!
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Unread postAuthor: lukemc » Mon Apr 09, 2007 6:46 pm

how does the air get by the piston you said it makes a good seal
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 10, 2007 2:27 am

lukemc wrote:how does the air get by the piston you said it makes a good seal


Since it's cast in the actual tube it travels in, the piston is a near perfect fit, but obviously there are no rubber seals or o-rings so it's not a 100% leakproof system, which works out fine.
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Unread postAuthor: zeigs spud » Wed Apr 11, 2007 3:18 pm

1-why doesn't that foam sheet break when air is released, if what i see is that is a diaphram activated cannon

and how do ur realease air fast enuf through a scharder valve??
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Unread postAuthor: Scope » Wed Apr 11, 2007 4:01 pm

That is a pretty sick cannon!!
you make some crazy stuff!!
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 11, 2007 11:19 pm

zeigs spud wrote:1-why doesn't that foam sheet break when air is released, if what i see is that is a diaphram activated cannon

and how do ur realease air fast enuf through a scharder valve??


The foam sheet isn't part of the structure as such, it's really just there to hold the epoxy while I pour it, all the strength comes from the epoxy. There's no diaphragms anywhere, it's just a normal piston cannon, but instead of the rubber seal being on the face of the piston, it's stuch to the end of the barrel.

I can afford a schrader for piloting because the pilot volume is only 1/5 of a cubic inch :wink:
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