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Two small pneumatics guns

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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Two small pneumatics guns

Unread postAuthor: homedepotpro » Wed Jul 18, 2007 1:27 pm

i built these the other day with spare parts and epoxy. the larger one shoots marbles at pressures around 10-40psi, the smaller one is a coaxial that shoots airsoft bb's
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the marble gun has a rubber catch in the back of the barrel so the marbles won't fall out, at 30psi it can put a quarter inch dent in my steel lockers.
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this gun was also thrown together. i constructed the piston out of a half inch length of a small dowel wrapped in electrical tape with a neoprene sealing face gooped on. i have checked it for leaks under water and now it holds air perfectly. I have only taken it up to 30psi but i might take it to 50 or 60
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this is my air compressor and tank, im going to get a regulator for the 11 gallon tank soon
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Unread postAuthor: dauphinoise potato » Wed Jul 18, 2007 2:59 pm

OOoh ghetto, those look pretty fun, the only thing i can think off is change the bottle chamber to a coke one. Ghetto
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Unread postAuthor: iknowmy3tables » Wed Jul 18, 2007 3:25 pm

cool but the bottle you chose looks like a cheap waterbottle, not only is the volume less than soda bottle but its not ment to take presure, but soda bottles are and can hold more presure, which is why I'm saving three 3liter soda bottles in my basement
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Unread postAuthor: mopherman » Wed Jul 18, 2007 3:29 pm

how, far does you piston move back and what diameter pipe is that? ( the small one)
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Unread postAuthor: homedepotpro » Wed Jul 18, 2007 4:52 pm

the piston moves like a quarter of an inch, the outside pipe is 3/4''
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Unread postAuthor: benstern » Wed Jul 18, 2007 6:12 pm

I will be the first to say that jb weld is terrible with plastic pipe.
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Unread postAuthor: mopherman » Wed Jul 18, 2007 6:15 pm

benstern wrote:I will be the first to say that jb weld is terrible with plastic pipe.

It should hold at like 30 psi if he sanded his pipe. i wouldnt worry about it.
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Unread postAuthor: homedepotpro » Wed Jul 18, 2007 7:06 pm

mopherman wrote:
benstern wrote:I will be the first to say that jb weld is terrible with plastic pipe.

It should hold at like 30 psi if he sanded his pipe. i wouldnt worry about it.

i was thinking about scrapping it but i just tested it up to 70psi and it held its integrity, so im going to keep it. i still not going to take it above 40
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Unread postAuthor: spud yeti » Wed Jul 18, 2007 11:55 pm

Looks like two nice cannons, but what is their performance like at the (comparitively) low pressures youre running them?
EDIT: very sorry, just saw my answer now (1/4" dent in locker)
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Unread postAuthor: f.c » Thu Jul 19, 2007 4:36 am

i like small cannons. these are excellent examples of small cannons. keep up the excellent work.
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 19, 2007 5:00 am

homedepotpro wrote:i was thinking about scrapping it but i just tested it up to 70psi and it held its integrity, so im going to keep it. i still not going to take it above 40


now if you had used proper epoxy and technique, you could have happily taken it above 300 :D
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Unread postAuthor: spudthug » Thu Jul 19, 2007 9:04 am

you are never going to be able to service your piston unless u cut off part of the chamber...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 19, 2007 9:27 am

spudthug wrote:you are never going to be able to service your piston unless u cut off part of the chamber...


That's the eternal problem with my piston guns, however it does drive you do make designs that don't need to be serviced for the entirity of their useful lives.
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Unread postAuthor: iknowmy3tables » Thu Jul 19, 2007 9:27 am

oh I didn't notice before about the location of the schrader on the bottle gun, very cool I'm usally uneasy on puting schradders in bottlesthe schrader in the valve is pretty good maybe now I'll make a cannon with my 3 liter
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Unread postAuthor: homedepotpro » Thu Jul 19, 2007 12:34 pm

spudthug wrote:you are never going to be able to service your piston unless u cut off part of the chamber...

i did, i had too. the first piston i made was faulty, but i got a coupling and put it back together.
oh I didn't notice before about the location of the schrader on the bottle gun, very cool I'm usally uneasy on puting schradders in bottlesthe schrader in the valve is pretty good maybe now I'll make a cannon with my 3 liter

yeah its one of those with a guide rod in it so it made it possible for me to put it there, which was handy when i used it for my larger coaxial.
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