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Piston Valve Design

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: LynyrdSkynyrd » Sun May 11, 2008 4:10 pm

Thats not a bad idea. :idea:

As far as materials are concerned we were planning on using Ultra-High Molecular Weight Polyethylene (UHMW) for the back plate and the piston. everything else is just scheduled pipe fittings. UMHW is oil filled and very slick (and cheap).

I've been getting split impressions on machining it though. Some people say its a [female doggy] to machine others say is easier than most plastics.
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Unread postAuthor: Velocity » Sun May 11, 2008 4:32 pm

LynyrdSkynyrd wrote:Thats not a bad idea. :idea:

As far as materials are concerned we were planning on using Ultra-High Molecular Weight Polyethylene (UHMW) for the back plate and the piston. everything else is just scheduled pipe fittings. UMHW is oil filled and very slick (and cheap).

I've been getting split impressions on machining it though. Some people say its a [female doggy] to machine others say is easier than most plastics.


I've heard that UHMW Polyethylene is very easy to machine. Also heard good things about Delrin (don't know if they are different; believe they are related).
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Unread postAuthor: LynyrdSkynyrd » Sun May 11, 2008 5:22 pm

UHMW and Delrin are the "self-lubricating" type plastics. Delrin is a little on the expensive side. And it doesn't have a high impact strength either comparative to UHMW.
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Unread postAuthor: DonTheLegend » Sun May 11, 2008 6:01 pm

Modified piston, along the lines of what gippeto suggested. Reduces weight without increasing the pilot volume.
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Unread postAuthor: jrrdw » Sun May 11, 2008 6:35 pm

Don, have you built any of this yet?
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Unread postAuthor: DonTheLegend » Sun May 11, 2008 6:53 pm

No, haven't bought materials yet either.
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Unread postAuthor: LynyrdSkynyrd » Sun May 11, 2008 9:47 pm

we're just kinda playing with ideas right now.
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Unread postAuthor: mike1010 » Mon May 26, 2008 3:10 am

what design program did you use to make that image it looks great?
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Unread postAuthor: DonTheLegend » Mon May 26, 2008 10:29 am

Thanks, we used NX 5 to draw everything, and then we just took images of the screen with snipping tool (Vista only, I think).
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