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The best type of material to use as a piston?

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: Brian the brain » Sun Aug 28, 2011 12:03 pm

:roll:
Whatever caused it...it would be better to have a little more clearance to prevent it and have O-rings to overcome the issue.

It is a blast to lathe or shape on a drill and pretty tough.
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: stuffbuilder » Thu Sep 01, 2011 7:51 pm

Whatever you do stay away from wood. There's no way to machine it to the point where it won't leak around the O-rings
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Unread postAuthor: Crna Legija » Fri Sep 02, 2011 1:41 am

stuffbuilder wrote:Whatever you do stay away from wood. There's no way to machine it to the point where it won't leak around the O-rings


wood works just fine, you just have to seal the wood with pea glue or varnish to stop it swelling and binding
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Unread postAuthor: jsefcik » Fri Sep 02, 2011 2:54 pm

mattyzip77 wrote:Jessie are you serious?? Why would you re post that??


was a mistake,

And BTB cleaned up the mess.. :D
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Unread postAuthor: Gun Freak » Fri Sep 02, 2011 3:50 pm

Twas not a mistake...
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Unread postAuthor: mattyzip77 » Fri Sep 02, 2011 5:16 pm

Gun Freak wrote:Twas not a mistake...

:violent1:
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Go Bruins!!!!
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Unread postAuthor: stuffbuilder » Mon Sep 05, 2011 1:18 am

wood works just fine, you just have to seal the wood with pea glue or varnish to stop it swelling and binding


Its not that the wood swelled up and jammed (it was varnished), but rather the O-ring groove could not be machined fine enough to make a good enough seal
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Unread postAuthor: Technician1002 » Mon Sep 05, 2011 3:19 am

Use glossy enamel paint to seal the wood pores and leave a smooth finish on the grooves.
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