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Sealing face issues

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: Technician1002 » Sat Jul 16, 2011 11:57 pm

That is a great way to look for proper fit. It is the say I sanded the pistons for the Mouse Musket. In the photo below, you can see some remains of one of the lines I drew on the side of the piston as it was lapped down to fit the breech. The piston was without an o ring so it depended on a very close fit to seal properly. As Gippeto mentioned, this works for the piston face too.
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Unread postAuthor: Mr.Tallahassee » Sun Jul 17, 2011 2:25 am

I fixed it. I did the water test and found that I had a full diameter leak. I sanded the end of the barrel on sand paper on plywood for about ten minutes. I used 860 grit to smooth it then polished it with 1500. It's a perfect seal. I also increased the travel of my piston to compensate for a somewhat loose sealing face. The rubber I used is hose splicing tape and it is absolutely leak free. Thanks for the help.
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Unread postAuthor: jhalek90 » Sun Jul 17, 2011 7:50 am

in the future, and excellent way to get a seal on a "Almost" true sealing face, it to place a felt disk or 2 behind your sealing face, so it has a little give. This has never failed me when a have a piston that almost seals.

Glad you got it working though! Congrats!
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