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mini co-axial 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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mini co-axial piston cannon

Unread postAuthor: jave101 » Wed Aug 09, 2006 2:32 am

i just finished this cannon the other day, its a co-axial piston valve cannon with a 3/4" 14" barrel and 1" pressure chamber. the back end of it can be unscrewed to service the piston which is just a bottle cap with pvc tape around it to seal it and a 1/16" rubber disc to seal against the barrel.

for its size it does pack a punch, but to increase its performance im thinking of replacing the back end and installing a pneumatic sprinkler valve to vent quicker like i hav on my larger co-axial.

i wanted to make a cannon that kinda looks like a machine gun, with the sprinkler valve i think it'll look alot better.

when i get a chance i will measure the speed of the marbles leaving the barrel with my new chrony i just got i'll let u know what the results are.
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Attachments
minigun1.jpg
i reckon the paint job looks pretty cool
minigun2.jpg
new sprinkler valve shoots alot harder
Last edited by jave101 on Mon Aug 28, 2006 9:36 am, edited 1 time in total.
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Unread postAuthor: killagorrila99 » Wed Aug 09, 2006 2:52 am

nice!


and just to make this long enough...
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Unread postAuthor: Atlantis » Wed Aug 09, 2006 9:54 am

Nice and clean. Good job! Cool paintjob. I would have figured that there would'nt have been much spac between a 3/4" pipe and a 1" pipe.
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Unread postAuthor: noname » Wed Aug 09, 2006 10:53 am

There isn't much space but he has a handle coming down.
Nice paintjob, clean cannon.
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Unread postAuthor: spudkpi » Wed Aug 09, 2006 10:57 am

Wow that is a very unique paintjob. How'd you paint it up liek that?
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Unread postAuthor: PVC Arsenal 17 » Wed Aug 09, 2006 6:30 pm

Atlantis wrote:Nice and clean. Good job! Cool paintjob. I would have figured that there would'nt have been much spac between a 3/4" pipe and a 1" pipe.


ERR... It doesn't.... I tried it today at Home Depot to see if I could make a 3/4 piston. Typo perhaps??
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Unread postAuthor: jave101 » Thu Aug 10, 2006 1:25 am

yeah there isn't alot of space thats why i put that handle on there which stores pressure too, its enough to launch a marble pretty far though.

painting it was pretty simple, just a base coat of olive drab then when that dried afew dots and streaks with a can of black paint. looks pretty cool i reckon
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Unread postAuthor: MrCrowley » Thu Aug 10, 2006 1:52 am

Yeah that does look pretty cool,im thinking of doing the same paintjob style as you but a light brown with olive drab type thing 8)
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Unread postAuthor: mark.f » Thu Aug 10, 2006 6:45 am

That is most likely 1-1/2" or 1-1/4" pipe. I can't even get 3/4" pipe to fit into 1" pipe.
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Unread postAuthor: djt » Thu Aug 10, 2006 3:12 pm

read the original post buddy.

"i just finished this cannon the other day, its a co-axial piston valve cannon with a 3/4" 14" barrel and 1" pressure chamber."
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Unread postAuthor: PVC Arsenal 17 » Thu Aug 10, 2006 4:16 pm

markfh11q wrote:That is most likely 1-1/2" or 1-1/4" pipe. I can't even get 3/4" pipe to fit into 1" pipe.


You're right. I said the same thing. Unless they have some kind of SDR 1" that he used...
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Unread postAuthor: mark.f » Thu Aug 10, 2006 5:22 pm

I'm saying it's maybe a typo. 3/4" doesn't fit into 1" usually. It's most probably 1-1/4" or 1-1/2" pipe for the chamber.

Only way to find out for real is to get the author's answer.
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Unread postAuthor: Bluetooth » Thu Aug 10, 2006 7:06 pm

Awsome cannon i always wanted to make a co-axial because they are like really powerful but they seem hard to make.
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Unread postAuthor: noname » Thu Aug 10, 2006 8:44 pm

They're actually really easy if you know what your doing.
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Unread postAuthor: jave101 » Fri Aug 11, 2006 2:47 am

ok the larger pipe is 1 1/4 ED and 1 1/8 ID
the barrel is 7/8 ED and 11/16 ID

all the markings on the pipe and fittings say 25mm which is an inch so thats how i got confused[/img]
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