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Coaxil Piston Gun Questions/Suggestions

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: LCTChamp » Mon Aug 29, 2011 5:15 pm

Gun completely built but piston wont seal :(

I have checked for particles and cleaned it which didn't fix the issue.

Ideas?
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Unread postAuthor: Gun Freak » Mon Aug 29, 2011 5:16 pm

Pictures...
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 29, 2011 5:17 pm

Breech end not cut at 90 degrees?

Not filling fast enough for pressure to build up?
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Unread postAuthor: LCTChamp » Mon Aug 29, 2011 5:21 pm

Pictures will come but I cant seem to find my camera.

Breech end was cut in a mitre box and then sanded. Im filling with a large air compressor, so I don't think that is the issue. Im dumbfounded :?:
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 29, 2011 5:28 pm

Is the barrel properly centred and supported? Could the washer keeping the sealing face rubber be making contact with the breech edge?
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Unread postAuthor: Technician1002 » Mon Aug 29, 2011 5:57 pm

You may need to lap the valve to remove any surface imperfections from the valve seat or valve face.

I lap all my non QDV valves.
http://www.youtube.com/watch?v=fhXsH12Rg6s&feature=player_embedded

You can see the ring on the face of my piston where it was lapped on the valve seat seal.
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Unread postAuthor: LCTChamp » Tue Aug 30, 2011 6:09 am

jackssmirkingrevenge wrote:Is the barrel properly centred and supported? Could the washer keeping the sealing face rubber be making contact with the breech edge?


Ahh :oops: What should I use as a barrel support?
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 30, 2011 6:27 am

LCTChamp wrote:Ahh :oops: What should I use as a barrel support?


It could be as simple as three screws at 120º in the breech end, adjusted so they protrude enough to keep the barrel centred, and epoxied to prevent air from the chamber leaking into the barrel. They also provide a convenient "projectile stop" keeping whatever you muzzle load from going into the chamber.
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