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.

Step 1: Materials

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
hacksaw or radial arm saw
tape measure

DISREGARD THE PIECE THAT IS CONNECTED, THE TWO ELBOWS AND SPLIT PORT, it was for an add on but i messed it up =/
can this thing shoot a golf ball?
What size elbow do I need? Becuase it doesn't say what size on the ible.
making this!<br />
how much do ball valves cost?
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
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
with the cement, primer, pvc, ball valve, hot glue (if you don't already have any), and tire valves, the project cost can escalate.
What waas that add on that you were going to make?
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. =]<br/>
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.
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.
thanks i'll give that a try
Oh, and a little silicone lubricant makes it easier to push through, too.
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.

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