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This is a 3/4 inch pneumatic cannon that is very simple and cheap to make.
THE BEST AMMO FOR THIS CANNON IS PAPER DARTS. they are even simpler and cheaper to make than the cannon. I cannot take credit for this because i found this from someone else but i will put a link for it.Paper Darts

P.S. yes, i did use a few images a couple times.
 
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Step 1: Materials

Picture of Materials
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2- 90 degree elbows

1- long piece of 2/4 inch PVC piping, buy enough for your standards; longer or less depends on you

1- ball and socket valve 3/4 inch

1- 3/4 inch end cap

1- tire valve replacement from autozone or pepboys etc.

1- can of PVC cement
Tools:
Drill
hacksaw or radial arm saw
sandpaper
tape measure
bike pump WITH PRESSURE GAUGE
pen

DISREGARD THE PIECE THAT IS CONNECTED, THE TWO ELBOWS AND SPLIT PORT, it was for an add on but i messed it up =/

Step 2: Measure and cut the pieces

Picture of Measure and cut the pieces
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measure how much piping you have and make a smaller barrel than the compression chamber.

measure the height from where it is comfortable to hold the barrel at to fire to the top of your shoulder so you can shoulder mount this.

cut the barrel long enough but don't overkill this.

leave the rest for the compression chamber.

Step 3: Cement!

Picture of Cement!
add a generous amount of PVC cement to the inside of the elbows.

glue all the pieces together and push together with a lot of force for about 2 or 3 seconds to get a good hold.

DO NOT CEMENT THE END CAP YET! IT STILL NEEDS THE TIRE VALVE!

Step 4: Drill!

Picture of Drill!
Grab your drill and drill bits.

you will need a bit that is slightly bigger than the bore of most of the tire valve so it sticks out but gets the other end caught.

drill the hole and make sure the tire valve is facing out the exit side of the end cap and clears it.

super glue the valve into place. (I've tried to glue it on the inside but it's very difficult and glueing just the outside works just the same.)
TylerBerzzz3 years ago
can this thing shoot a golf ball?
lil larry4 years ago
What size elbow do I need? Becuase it doesn't say what size on the ible.
mdl995 years ago
making this!
tony488 years ago
how much do ball valves cost?
pbpenguin5 (author)  tony488 years ago
like 2 bucks or less on 3/4 or 1/2 inch. could be more with increasing diameter. about 7 dollars to make this one.
But isn't it better to use a sprinkler valve since that doesnt screw up ur aim as much. FOr example the ball valve takes a lot of force to open, so you JERK it and ur aim is off. Then you are screwd. But on sprinkler valve u just flip a switch and you can even make a button trigger, ti make it more of a gun. Im working on a sniper/ AUG design
pbpenguin5 (author)  tony487 years ago
a few dollars or less.
it cost me 6 dollars to make a cannon with a 3/4 inch barrel and a 1 inch chamber
pbpenguin5 (author)  struckbyanarrow5 years ago
with the cement, primer, pvc, ball valve, hot glue (if you don't already have any), and tire valves, the project cost can escalate.
tony487 years ago
What waas that add on that you were going to make?
pbpenguin5 (author)  tony487 years ago
honestly i have no idea. i guess it was some double barreled thing. i had a few extra pieces due to my over-buying on accident. =]
ccrook8 years ago
Why both gluing the tire valve in? If the hole you drill is just small enough to force the valve's lip through from the inside out, the inside pressure will keep it in place. I believe I used a 3/8ths bit for my old pneumatic potato gun.
ccrook ccrook8 years ago
I would use caulk or some other semi-flexible adhesive around the rubber tire valve if you need to re-glue it. Super glue is extremely brittle.
pbpenguin5 (author)  ccrook8 years ago
thanks i'll give that a try
ccrook ccrook8 years ago
Oh, and a little silicone lubricant makes it easier to push through, too.
finfan78 years ago
I made something very much like this a couple years ago. I used a 1 inch wide tube for the barrel i think about 4 ft long. The standard u turn and valve and then a big air canister i think 4 in wid by 1.5 ft long. i don't have it here so im not sure how accurate that is. fired pebbles accross the park though.