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Small piston sealing face

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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Small piston sealing face

Unread postAuthor: Lockednloaded » Fri Nov 13, 2009 8:57 pm

I am making a mini coax at the moment, but my piston is in dire need of a sealing face. I have a solid teflon piston, and was wondering is one of those "LiveStrong" type rubber bracelets like This would work well as a sealing face
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Unread postAuthor: D_Hall » Fri Nov 13, 2009 10:08 pm

Properly machined, the teflon itself should provide a nice sealing face.
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Unread postAuthor: Lockednloaded » Fri Nov 13, 2009 10:11 pm

um... well the piston is made of teflon tape not solid machinable teflon. it is wrapped and compacted into a cylindrical shape, kinda ghetto, but it works for such a small piston.
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Unread postAuthor: psycix » Mon Nov 16, 2009 6:34 am

wrapped and compacted into a cylindrical shape

:shock: I'm not sure if that will hold together...
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Unread postAuthor: Technician1002 » Mon Nov 16, 2009 6:38 am

A solid piston is highly recommended. The bracelets are soft, but not flat. Getting a seal to fill the cannon is difficult. If it seals the pressure may cut it. I would recommend using a faucet washer instead.
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Unread postAuthor: tghhs » Mon Nov 16, 2009 6:39 am

How small are we talking?
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