Pneumatic Snowball Cannon

Step 7 Create the automatic firing mechanism

You obviously can't open the valve fast enough, being a human and all, but don't worry, I have a solution for that. First, you will need a 5/16th socket, from a ratchet. This should fit perfectly over the bolt for the lever on the ball valve. If you're using another ball valve, just find one that fits.
Now, check if that socket fits in your drill. If it does, you're all good. If not, you'll have to do what I did. Find an Allen wrench that fits into the opposite side of the socket, and make sure it doesn't spin when you put pressure on it. Do not try to over turn it, you'll strip the threads. I stripped mine, but all I had to do is take off the washer and use the threads there. Anyways, once you make sure it fits, you'll have to cut off the shorter half of the Allen wrench, so that it spins right. The first picture is the valve with the socket and wrench all set up. You can use a hack saw or a grinder, I choose grinder for this one, because it's less delicate. The long side of the allen wrench will go into your cordless drill, to fire. This is why you need a clutch drill, you have to put it all the way on 1, so it'll open the valve and start slipping when it hits the stop.