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Piston O-rings

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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Piston O-rings

Unread postAuthor: Bluetooth » Sun Aug 20, 2006 11:17 am

Im thinking of making a 1.5" co-axial piston cannon and i want to use Foxxlord's (from spudtech) 3" piston design http://www.geocities.com/cain333_2000/down sized so instead of using 3" and 2" i would use 1.5" and 1". Would i need to use O-rings because i drew the piston out on a piece of paper to scale and it was 1 3/8 of an inch so thats 1/16 of an inch all the way around?
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Unread postAuthor: noname » Sun Aug 20, 2006 12:12 pm

You don't need o-rings for pistons in coaxials, just get a fit as good as possible. 1/16" might not seal against the barrel, 1/16" on only one side of the piston. Or you could use a diaphragm, which is a whole lot easier.
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Unread postAuthor: SpudStuff » Sun Aug 20, 2006 12:43 pm

Using O-rings increaces performance like you wouldn't believe. use a hacksaw to make a shallow groove around the piston then widen and deepen it with a file until it makes a seal when you install the rings
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Unread postAuthor: Bluetooth » Sun Aug 20, 2006 1:23 pm

But a diaphram doesn't let as much out at once right?
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Unread postAuthor: noname » Sun Aug 20, 2006 3:39 pm

Not quite as much but it's really cheap, simple, and usually just a circle of rubber.
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Unread postAuthor: Bluetooth » Sun Aug 20, 2006 4:28 pm

I still think im going for the piston and if it doesn't work ill modify it into a diaphram.
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