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help please

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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help please

Unread postAuthor: jon_89 » Wed May 02, 2007 12:30 am

i just built a copper burst disk gun. all of it is .5in. does anybody know how to get a air tight seal at the union?
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Unread postAuthor: hi » Wed May 02, 2007 1:10 am

this helps alot.

Image

seriously, it does, i hade the same problem with my hybrid.

ohh, this helps too.

Image

it may sound like im being sarcastic, but it truly does help.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: jon_89 » Wed May 02, 2007 1:11 am

i already tried both
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Unread postAuthor: hi » Wed May 02, 2007 1:14 am

then you have a defective union. check the inner ring, is it dented at all?

another thing is that your burst disk might be to thick.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: noname » Wed May 02, 2007 6:59 pm

Put a gasket on each side of the burst disc. Metal unions leak like hell by themselves, it's just life.
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Unread postAuthor: iknowmy3tables » Wed May 02, 2007 7:04 pm

it could also be because of how you set the burst disk, you can goop up the parts teflon tape can't reach
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