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Piston sealing face deforming

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: clemsonguy1125 » Sun May 16, 2010 3:09 pm

i thought you epoxied it
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Unread postAuthor: Gun Freak » Sun May 16, 2010 3:11 pm

Hah I used a screw and washer for my co ax, IIRC.
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Unread postAuthor: MrCrowley » Sun May 16, 2010 4:14 pm

I use the orange rubber gaskets that look like this (but with a much smaller hole in the middle):
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They're about 1/8" thick and have never failed me. I use them on all my large pistons.
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Unread postAuthor: Gun Freak » Sun May 16, 2010 5:08 pm

I don't think they have those at Ace... I never seen them in stores. Thanks though.
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Unread postAuthor: MrCrowley » Sun May 16, 2010 5:13 pm

You should be able to just superglue it really. By the way, I love how you and clemsonguy always have these long threads where it's just you two replying :wink:
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Unread postAuthor: Gun Freak » Sun May 16, 2010 5:16 pm

Haha yeah well we were the only ones online at the time lol
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Unread postAuthor: qwerty » Mon May 17, 2010 9:50 am

Happens to me too, i think you just need a thicker face or to glue it down somehow. I think it's caused when the rubber is stretched round the barrel.

EDIT: oops didn't see page 2 :roll:
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Unread postAuthor: Technician1002 » Mon May 17, 2010 11:07 am

Sometimes this is caused by the narrow edge of the end of the barrel. It cuts into the rubber due to the high force. In 2 of my launchers I glued a coupler on the end of the barrel and then cut the barrel and coupler so the valve seat is wider.

The original plan was to put the seal in the valve seat so I could make the piston much lighter. With a file I narrowed down the end of the barrel to make a groove that held an o ring when the coupling was placed on the barrel. It can be seen in this photo of the Mouse Musket valve seat. It worked very well.

Mouse Musket valve seat. Barrel is thinned on the outside. A coupler is thinned on the inside. The result is sanded flat and an o ring is glued in the groove.
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