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Check-valved piston build log

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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Check-valved piston build log

Unread postAuthor: saefroch » Thu Nov 25, 2010 10:53 pm

FighterAce's thread here inspired me to create my own thread on the check-valved piston I've been working on for quite some time now, and it seems like I've finally got a good chance of success. The idea here is to create a piston valve where there is no leak from the chamber to the pilot during operation.

Image
Image
There is a 1/4" OD o-ring between the 6mm BB and the threaded rod, I just didn't happen to include it in this picture.
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Image

Note the fail that occured as I cut the rearmost o-ring groove. Turns out the hole for the valve was too off-center:
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Right now my greatest problem is that my 1/2" UHMWPE rod that I purchased from McMaster is actually >1/2" in diameter. Hopefully I'll be making some significant progress soon, as I currently have no operational pistons. :?
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