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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.
A diagram of the breech end internals:
I had a lot of fun with this particular creation, here's the damage videos.
cell phone shot with a marble:
and the bits I managed to recover:
coffee can filled with water shot with a marble:
coffee can filled with water shot with multiple lead BBs:
coffee can shot with a whiteboard marker:
computer mouse shot with a marble:
computer speaker shot with a marble:
flatbed scanner shot with a marble:
electric kettle filled with water shot with a marble:
diving mask shot with a marble:
and last but not least, xmas angel with a head full of red paint
Last edited by jackssmirkingrevenge on Sun Aug 12, 2007 1:57 am, edited 4 times in total.
that is a great idea and desgin im sure it will inspire other people including me
and lots of good videos
Awesome video's. That cannon is super powerful. Any idea what fps it shoots at?
Airbeds... so many different uses
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.
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
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
if you liked that, you'll love my website
Here's the pics in the original post, don't know what's up with photobucket
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!
There are rules, and then there are hundred dollar bills.
how does the air get by the piston you said it makes a good seal
"Those who are different change the world. Those who are the same keep it that way"
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.
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
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