Air Cannon With Adjustable Barrel Size. Bouncy Balls Shot Over 100yrds!

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Introduction: Air Cannon With Adjustable Barrel Size. Bouncy Balls Shot Over 100yrds!

This is my first Air cannon an Instructable i have done. This Air cannon uses compressed air. It is released by a electrical irrigation valve. The barrel is easy to change size. The barrel i used shoots bouncy balls over 100yrds at only 50-40psi. I have tested mine up to 100psi before it started to leak. This is a very easy an fun thing to build. I get a big kick out of seeing a rubber ball flying accross the sky.

My camera has just broke. I will try to post pics up asap. Sry for the horrible drawings an diagrams.

Also the hot glue gun is for making a holder for the 9volts an a mount for the buttons.

Video of it as of July 20th 2007

Step 1: Parts List!! Tools!!!

Tools

Drill
pvc cleaner
pvc cement
Hack saw
Hot glue gun
Somthing to strip wire
Electrical tape.
Teflon tape

Parts.

"Home Depot"

About 3ft of 2" schedule 40.
A long 1" schedule 20 pvc pipe.
2" slip cap.
2" slip cuppling.
2" x 3/4" Slip x Thread Bushings.
Three threaded reducing male adapters 3/4"x1".
A 3/4" irrigation valve

"Ace Hardware"

A theading tire valve. This took me a while to find. It is a metal stem valve, just as one on a bike. It will have threads on the end that gose into the pvc. Rumors are that there findable at autozones an auto suplies stores.

"Radio Shack"

Five 9 volt batterys.
Five 9v battery connecters.
One switch an one push button.

I will get pics up i tryed taking pics but my camera isnt working right now. How convenient!

Step 2: Building the Cannons Compresstion Chanber.

Tire valve to slip cap.

Once you have gotten evreything first you will want to start on the 2" slip cap an tire valve. It is important you do it like this. First find a drill bit that looks to be the same size as the valve. Then test it out on some of the 1" pvc. Drill the hole out an then screw the valve in to make sure the bit is a good size. You want the bit to make its own threads in the pvc. If its a good match then get the cap. Try to get as close to center of the cap as possible. Once the hole is drilled then rap the threads of the valve once or twice an screw it in.

Chamber''''

Clean the inside of the slip cap an the 2" pvc. Glue the Slip cap to 2" pvc pipe about 3ft long. Now clean the other end of the 2" pipe, slip cupling, an the reducing bushing. Glue these together an try to keep them even so the 2" pvc pipe gose in an meets the reducing bushing in the middle as best as you can.

Step 3: Chamber an Valve Link.

The chamber an valve link will connect the compresstion chamber to the vavle. Cutt about 5inches of the 1" pvc pipe. Now clean both ends an glue the 3/4"x1 male addapter to the 1" pipe just cutt. Do the same with the second 3/4"x1" male addapter.

Step 4: Connecting Valve to Chamber.

Now using the link you just made Teflon tape one of the threaded 3/4"x1" addapters an screw it into the bushing of the compresstion chamber. Then teflon the other side an screw the valve on. So you have a cannon with out a barrel.

Step 5: Wireing the Valve.

The solenoid only takes 3 9 volts to push it but i like to use 5 so i dont run out of power that often. First run your push button to yor connector. then wire all the connections the same way to follow the pattern. an so the connector isnt turned the wrong way an stopping the circuit from working. Then run to the switch witch will act as a safety.


To test if its working turn the switch on an push the button. If you hear it click then it is working.

Step 6: Finishing

Now Clean an glue the 1" pvc pipe to the last 3/4"x1" addapter. Teflon tape it an screw it in the valve.


To test this i suggest putting a inch of water down the hatch an using a bike pump to pump it a good few times. Then release the button an watch it spray.

I tested mine with a compressor an it didnt give until 120psi. It gave in a connection witch it will always break first. The only time this will shatter is if the pvc has been out in the sun for a very long time an is brittle. I suggest using only new pvc. Also I shoot bouncy balls using only 40psi an it shoots them across the local football field an some.

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    49 Comments

    Do you know of any other places that would have a threaded tire valve?

    1 reply

    I get them from Acehardware.

    if the solenoid takes 3.5 volts (it needs to stay pulled in, jerking in and out isnt correctly operating) then you need to take those 9volt batteries and put them in parallel. that'll keep the voltage the same, and extend the battery life.

    No, I made this a long time ago. I would have to guess around $20-$40. It was just a fun toy to mess with. I some how missed your comment untill now sorry.

    I would have the first time but i didn't have the proper tools where i was living at the time.

    Proper tools?, iron pipe is threaded. Iron cannons are much more fun, you can put them up to 150 psi or more.

    Ive gotten my pvc cannon up to 140 before. I only didn't go farther because thats all my hand pump could take. I think I could have gotten it up to 150 no problemo.

    It doesn't matter how high you can get it, what matters is whether it is safe at the pressure you are using it at or not. I personally would never go above 125 PSI with PVC, but suit yourself.

    The PSI rating is 280 so I think I'm safe half that.

    Owe i wasn't paying attention. I though you were saying copper hah. Witch would have meant soldering.

    you need to modify your sprinkler valve for pneumatic dump so you don't need the batteries or the solinoid

    This is sooo much like mine the only difference is the valve mine is not as high tech.

    I`ve built a potato cannon before. the design looks pretty the same.

    2 replies
    I like to show these videos of shooting a broomstick, but if you want you can remove them.


    when i do the wireing, i only need 3 nine volt batterys

    that's pretty sweet, mines the same idea but just without the high tech valve LOL i want to make a potato cannon with 2 of those in it though, how much did they cost exactly? awesome gun btw. :)

    1 reply

    Sry for the long wait been traveling a bit. It was about 12$ for the valve then the rest of it was probably about 20$ so maybe around 304 i don't remember though.