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Blowgun on mini steel coaxial.

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: potatoflinger » Tue Mar 18, 2008 8:14 pm

The hardest part of making a steel coaxial is that it's hard to thread the barrel into the bushing backwards.
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Unread postAuthor: kablooie » Tue Mar 18, 2008 8:51 pm

Pizlo's advice makes sense to me, and makes me wonder whether you could not only attach pipe to the sealing face, but also put some (copper?) pipe inside the galvanized pipe to create a smooth surface to cast and use the piston. If not, casting in pvc would work too, although if you do use electrical tape, wouldn't the little bumps and imperfections tear it up after a few shots? Feeling the inside of the same size and type of pipe, it seems awfully rough. I know I will encounter the same problem, so please post whatever you did and if it worked or not. Thanks and good luck with your piston.
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Unread postAuthor: biged » Wed Mar 19, 2008 4:53 am

I welded a 1.5" washer to the end of a pipe 2" pipe, for a Linear Coaxial design. Works beautiful..

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///ed///
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Unread postAuthor: Counterstriker » Wed Mar 19, 2008 5:47 pm

Sorry I don't really understand that.. But this is my other question
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Unread postAuthor: bigbob12345 » Wed Mar 19, 2008 5:49 pm

With a barrel this short it will stay stable itself.
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Unread postAuthor: Counterstriker » Wed Mar 19, 2008 5:53 pm

kablooie wrote:Pizlo's advice makes sense to me, and makes me wonder whether you could not only attach pipe to the sealing face, but also put some (copper?) pipe inside the galvanized pipe to create a smooth surface to cast and use the piston. If not, casting in pvc would work too, although if you do use electrical tape, wouldn't the little bumps and imperfections tear it up after a few shots? Feeling the inside of the same size and type of pipe, it seems awfully rough. I know I will encounter the same problem, so please post whatever you did and if it worked or not. Thanks and good luck with your piston.


It's only rough in the small nipple.. The big one does have a rigid line but its fine. I will carve a line in the piston.
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Unread postAuthor: Counterstriker » Wed Mar 19, 2008 5:55 pm

bigbob12345 wrote:With a barrel this short it will stay stable itself.


But I only made it short for the picture. But I might keep it that small!
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