schrader valve+epoxy?

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Eddbot
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hey, was having trouble finding a schrader with threads and was getting bored so i cut one off an old bike tube, sanded off all the rubber, and was left with this

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just wondering if it would hold the pressure if i just epoxied it in
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cwazy1
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epoxy will work, alot of people have used that before.

but why did you sand off the rubber?? people use the rubber as a sort of washer type thing when they epoxy it in.
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Novacastrian
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Get a small file and put some grooves into the stem before you epoxy it in.
Gives the epoxy something grip to.
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Eddbot
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thanks

ps. what does leaving the rubber on accomplish
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ammosmoke
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Also make sure that you make a ring of epoxy around it on the inside of the chamber. Build up a supportive layer to form a sort of collar on the inside.
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mopherman
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Try epoxying it into a threaded fitting. I've done that before with great success. just dont get epoxy on the threads.
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spudgunnerwryyyyy
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Yeah do what mopherman said. And the rubber will hold much less pressure than the epoxy and would fail. Get a file and grind grooves just like bender said,

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Eddbot
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yeah i'll try what mopherman said

and i got the bender thing, i like futurama too
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jackssmirkingrevenge
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This is the system I use for all my designs, I can confirm that it works and very well :)
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rna_duelers
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Nice!Now I can finaly make 1/4 nipples swith schrader vlaves in them.
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spanerman
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yeah, its a good way, iff you have a copper cannon you can solder that stem right into any copper/brass fitting just make sure to remove the guts first...or youl fry them
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gwoloshyn
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Out of curiosity, what type of epoxy are we talking about?
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Eddbot
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i was just talkin about regular epoxy, btw is the stuff that takes 60 minutes to set any different from the quickset stuff?
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Hawkeye
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The slower Epoxy sets, the stronger it generally is. 24 hour stuff is the best. The quick set types that are a thicker paste can be hard to truly make a perfect seal.
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spudgunnerwryyyyy
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yeah, but every epoxy has its purpose. The thick stuff is for something different.
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