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Diagphram cannon

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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Diagphram cannon

Unread postAuthor: flamerz14 » Mon Jun 04, 2007 8:51 am

Can anyone tell me how they work and what parts they need? Comparitive to piston cannons, which is better?
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Unread postAuthor: Fnord » Mon Jun 04, 2007 8:59 am

A diagphram cannon uses a flexible (sometimes rubber) diagphram to seal the barrel, rather than a piston. The rubber is attached to the inside of the chamber and is forced forward against the barrel when air is injected behind it.

I think pistons are probably better overall. I imagine they are less prone to failure than diagphrams. A piston tends to be more sturdy.
(I've never built this type of cannon before, somebody correct me if Im wrong)
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Unread postAuthor: turbohacker » Mon Jun 04, 2007 9:22 am

you are correct, however i think that pistons are easyer to cunstruct and they are much more powerful!!!
build a co-axail piston gun. :D
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Unread postAuthor: MrCrowley » Mon Jun 04, 2007 3:06 pm

When I took apart a 21L 2HP air compressor the other day I found the box where the electric stuff is mounted in and stuff actually had a diaphragm valve for some reason. So if you come across one of them just nick the diaphragm out which is perfect for sealing a 32mm Barrel.
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Unread postAuthor: FLCLcowdude » Mon Jun 04, 2007 3:29 pm

MrCrowley wrote:When I took apart a 21L 2HP air compressor the other day I found the box where the electric stuff is mounted in and stuff actually had a diaphragm valve for some reason. So if you come across one of them just nick the diaphragm out which is perfect for sealing a 32mm Barrel.


The reason it has a diaphragm is because when the compressor reaches a factory set limit, usually 125 PSI inside the tank, the valve opens. When the valve opens, it trips a relay witch shuts off the motor. When the compressor drops back to 95 PSI, the valve closes, and the motor comes back on. Someone correct me if I am wrong on this.
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