Let's get started!
And be sure to check out lewster's page. He made the first cannon and inspired me to build this one, because I couldn't use his with my air compressor. Thanks L
Step 1: Parts
Some sort of valve (I used a 25mm [1"] ball valve)
2x 50cm lengths of Pressure rated PVC pipe (same as your valve size. In my case, 25mm)
End cap to suit your PVC pipe (again, 25mm)
Barb to 1/4" air fitting (I placed it in my end cap with epoxy)
2x hose clamps
30cm (1 foot) of air compressor tube
Tools your will need:
Something to get rid of burs
That is all you will need!
Step 2: Put Everything Together!
Now glue everything with PVC cement and primer. Follow the instructions on the label and glue everything together.
Give 24 hours for the glue to fully cure before applying pressure
Step 3: The Filling System
Step 4: Done!
Step 5: Safety
That is all I have to say
Step 6: Launch Procedure
My first major improvement was having inter-changeable barrels. To do this, get a male and female pair of 1" threaded to glue-on couplings. Cut the barrel about 1" from the valve and glue in the PVC couplings. To add another barrel, get a male coupling and glue it, with the suitable step down, or step up, coupling to suit the barrel size. I have a 15mm, 1m barrel and it's very accurate. I soldered up a cross-sight for aiming and it's fun to use. I also ordered a laser and it's going to attach to the barrel so I don't have to look through the sight. The next upgrade would be to upgrade the air chamber to a bigger diameter pipe.