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What material make a best 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: AnotherSnappedLine » Sat Feb 12, 2011 7:37 pm

Im debating my choice...it will be a spring loaded QEV so I need something light and quick(Epoxy). Im thinking of a 3/4-1" valve to a 1/2" barrel. me design will be sort of like this: http://www.youtube.com/watch?v=b4ZgXqia ... ure=relmfu[/url]
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Unread postAuthor: daniele tn » Mon Feb 14, 2011 3:28 pm

Has anyone tried to cast a piston out of this stuff? http://www.instructables.com/id/Making-BioPlastics-Environmentally-Friendly-Plast/

It look like it could be solid and lightweight.
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Unread postAuthor: AnotherSnappedLine » Mon Feb 14, 2011 6:41 pm

I looks pretty flimsy. I wouldn't take it above 50PSI
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Unread postAuthor: saefroch » Mon Feb 14, 2011 8:38 pm

Bioplastics info
Other plastics info
UHMWPE is usually considered the best material for a solid piston.
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Unread postAuthor: nadjatee1996 » Mon Feb 14, 2011 8:48 pm

saefroch wrote:Bioplastics info
Other plastics info
UHMWPE is usually considered the best material for a solid piston.


I'm going to use it as a filler
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Unread postAuthor: clemsonguy1125 » Mon Feb 14, 2011 10:52 pm

I've tried the bio plastic, be molded as it shrinks when it dries and can only be rolled out in flat sheets if you want it to end in the same shape
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Re: What material make a best piston?

Unread postAuthor: r00kie » Tue Feb 22, 2011 1:05 am

AnotherSnappedLine wrote:I've read about Bondo, epoxy, and hot glue to make a piston; which is the best substance?


Don't use hot glue if you have a warm climate, I found out the hard way that they tend to expand and become far less efficient, sometimes even jamming completely.
Epoxy is great, I can't fault it for a piston, it's highly mouldable, and sandable once it dries. JSR has a good thread somewhere showing epoxy pistons with different cores to reduce weight.
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Re: What material make a best piston?

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