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Sealing a 1'' pipe

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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Sealing a 1'' pipe

Unread postAuthor: maverik94 » Tue May 05, 2009 5:08 pm

Ok, a simple question. For my spring piston prototype, I need a 1" pvc piston, it pretty much needs to be filled with something that will make it airtight, so no air leaks out of the piston. Thanks!
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Unread postAuthor: jonnyboy » Tue May 05, 2009 5:26 pm

Seriously!? 3 different topics for something that could be put in one?

Epoxy
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mobile chernobyl wrote:I can shoot a Canuter Valve off my '82 Chevy Ram F150 AT LEAST 3/4 Mile with 'ma cannon made of soup cans duct taped together, then I just squirt some bacardi 151 in the chamber and hold up my cigarrete lighta and WHOOSH! That thing flies at least 3/4 mile
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Unread postAuthor: Biopyro » Tue May 05, 2009 5:27 pm

In before JSR - Epoxy? Edit: beaten to it!
Also try PU expanding foam, polymorph, melted plastic bags.

What sort of properties were you after?
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Unread postAuthor: maverik94 » Tue May 05, 2009 5:56 pm

sorry for the multiple posts. Well, it just needs to be airitight, strong, and cheap. What kind of epoxy?
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Unread postAuthor: Biopyro » Wed May 06, 2009 11:31 am

Putty or resin will be fine. There is a post in the how-to database explaining the whole process.
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Unread postAuthor: covey12 » Wed May 06, 2009 2:19 pm

just get jb weld, or that expoxy that comes with both parts in one plunger
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Unread postAuthor: Hubb » Wed May 06, 2009 2:34 pm

I took a section of the pipe to a hardware store and bought a wooden dowel that fit in it. It was just a little bit small, and this gap was fixed with some duct tape...assuming that all you need is a good fitting piston.
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Unread postAuthor: Technician1002 » Wed May 06, 2009 2:39 pm

hubb017 wrote:I took a section of the pipe to a hardware store and bought a wooden dowel that fit in it. It was just a little bit small, and this gap was fixed with some duct tape...assuming that all you need is a good fitting piston.


If the fit is very close a few layers of Polyurethane varnish may do the trick.
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Unread postAuthor: maverik94 » Wed May 06, 2009 2:56 pm

ok, I understand how to do that. Thanks yall!
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–Archimedes
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