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Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: MrCrowley » Wed Feb 27, 2008 11:32 pm

I love the guy with shaving cream on at the start of the scene, cracks me up everytime.

And what do burn apart from witches? More Witches!
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 27, 2008 11:46 pm

It's the awkward silences and half-mumbled words that make it so amusing :D
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Unread postAuthor: Lentamentalisk » Thu Feb 28, 2008 1:29 am

The nice thing about the whole surface area being squared, is that the reachable pressure increase increases exponentialy as you decrease in diameter. For example, with a 1/16" piston, using only 12lbs of force you can get up to 1000 psi. That would be an interesting project...
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 1:45 am

Lentamentalisk wrote:For example, with a 1/16" piston, using only 12lbs of force you can get up to 1000 psi. That would be an interesting project...


True, but unless you had a tiny tiny tiny chamber it would take you forever. I think 1/8" or 1/4" would be a better compromise.
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Unread postAuthor: SPG » Thu Feb 28, 2008 6:59 am

Or do you go buy one of those markers which has all the print on a plastic sleeve, warm the sleeve up slightly with a hairdryer or boiling water and slide the sleeve over your 3/4 inch copper tubing?
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2008 7:44 am

You read my mind ;)
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Unread postAuthor: pizlo » Thu Feb 28, 2008 6:30 pm

jackssmirkingrevenge wrote:Schraders should be ok for 800-900 psi.

I think this will make an interesting distraction from all the auto talk :) For my next trick, I was thinking of the pneumatic marker gun project - the main failing of the pen gun project was that the barrel was far too tiny. In something like this you can fit a larger barrel (4.5-6mm), larger chamber and maybe even an integral suppressor to complete the covert weapon theme...


When you have kids there always gonna yell at you to stop turning there school supplys into guns :P

You must have a bullet proof pocket protector.
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