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schrader valve+epoxy?

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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schrader valve+epoxy?

Unread postAuthor: Eddbot » Mon Nov 05, 2007 8:32 pm

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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Unread postAuthor: cwazy1 » Mon Nov 05, 2007 8:36 pm

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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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 8:42 pm

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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Unread postAuthor: Eddbot » Mon Nov 05, 2007 9:04 pm

thanks

ps. what does leaving the rubber on accomplish
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Unread postAuthor: ammosmoke » Mon Nov 05, 2007 9:15 pm

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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Unread postAuthor: mopherman » Mon Nov 05, 2007 9:35 pm

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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Unread postAuthor: spudgunnerwryyyyy » Mon Nov 05, 2007 9:46 pm

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,

bender=novacastrian
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Unread postAuthor: Eddbot » Tue Nov 06, 2007 12:47 am

yeah i'll try what mopherman said

and i got the bender thing, i like futurama too
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 06, 2007 12:50 am

This is the system I use for all my designs, I can confirm that it works and very well :)
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Unread postAuthor: rna_duelers » Tue Nov 06, 2007 2:24 am

Nice!Now I can finaly make 1/4 nipples swith schrader vlaves in them.
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Unread postAuthor: spanerman » Tue Nov 06, 2007 5:29 am

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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Unread postAuthor: gwoloshyn » Tue Nov 06, 2007 11:43 am

Out of curiosity, what type of epoxy are we talking about?
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Unread postAuthor: Eddbot » Tue Nov 06, 2007 8:37 pm

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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Unread postAuthor: Hawkeye » Tue Nov 06, 2007 9:16 pm

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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Unread postAuthor: spudgunnerwryyyyy » Tue Nov 06, 2007 9:25 pm

yeah, but every epoxy has its purpose. The thick stuff is for something different.
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