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Black Hole... My first Cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Paint color?

Flat Black.
9
64%
Grey.
1
7%
White over the purple.
4
29%
 
Total votes : 14
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Unread postAuthor: CuddlyBurrito » Tue Dec 25, 2007 1:17 am

ok i put a block of milled wood between the barrel. and i can notice a little faster response. but i have a big question. i am going to replace the dwv fittings with some pressure rated ones and i wanted to know if there is any way to remove the fittings with keeping some pipe?
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Unread postAuthor: MrCrowley » Tue Dec 25, 2007 3:40 am

Cut a slit down the DWV fitting where it meets the pipe and then use a screw driver and hammer to removie it. Then clean the pipe and apply new fittings with primer and glue.
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Unread postAuthor: tansit234 » Tue Dec 25, 2007 4:43 am

Yeah DWV scares me to no end, I've had a beat up PW tee fail. 2 inch tank tee at 90 psi. I was behind a garage door turned blast shield for that test though. I would recommend those things get replaced, they may hold pressure but if they get dinged or scratched all bets are off. Good though, I like the tank ratio and the valve, wasn't until my third cannon that I went modded orbit. Oh and in the future you can save yourself some money with a 4 pack of rubber tire stems and pulling them through a proper size hole, and they bend a little instead of denting. And about a short vent pipe, those valves operate on a pressure difference in order to fire, so the pressure difference is either there or not, the volume behind that diaphram is nil, I have most of mine on a 1/8" line or a direct connection with a 1/8" elbow. Get some cheap chinese hole saws and scrap 2x4 for spacer blocks. I think it looks awsome though, keep it up.
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