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piston sealing

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: dart guy » Wed Sep 25, 2013 8:01 pm

marents dont have to much tim and i would never expect free parts everything costs money :(
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Unread postAuthor: Gippeto » Wed Sep 25, 2013 10:31 pm

Are you trying to actually duplicate a factory QEV...

http://img.directindustry.com/images_di ... 235215.jpg

Or is it that you wish to build a piston valve?

Do you have a barrel size and configuration (co-ax, barrel sealing....) in mind?

If you're willing to build with care and attention to detail, many soft plastics can be used as a sealing surface...the lids used on margarine/coffee/etc. containers for example. Longevity may turn out to be an issue, but you can't beat the cost.

For a small piston valve launcher, you should be able to use the seal disc from the cap of a pop bottle.
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Unread postAuthor: Technician1002 » Wed Sep 25, 2013 11:26 pm

I made a custom valve seat for my Mouse Musket with an O ring. I bedded it in some caulking so it could be made flat in the valve seat. It worked well for a 1 inch valve.

The valve seat contained the seal so the piston could be made lighter and less likely to break. See the thread on the Mouse Musket for details on the valve seat construction.

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Unread postAuthor: PeteS » Thu Sep 26, 2013 5:50 am

Not sure if it helps but you can order from Lowes website and they will ship. The shipping would add to the cost though.

On the other hand there is usually a way to improvise with whatever junk is available if you really look.
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Unread postAuthor: dart guy » Thu Sep 26, 2013 3:45 pm

more or less gippeto wyz2285 did it so why cant i ( dont answer that)
edit i used a pink pearl eraser
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Unread postAuthor: turkeypig666 » Thu Oct 03, 2013 4:44 pm

I joined here when I was 14 (18 now) And I still built a few airguns. I drive a dirtbike, but I got mine plated for street, so I'm all good.
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Unread postAuthor: turkeypig666 » Thu Oct 03, 2013 4:44 pm

I joined here when I was 14 (18 now) And I still built a few airguns. I drive a dirtbike, but I got mine plated for street, so I'm all good.
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