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high pressure burst disk glue?

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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Unread postAuthor: Sticky_Tape » Sun Feb 17, 2008 10:19 am

here are the brass fittings that I was talking about.

EDIT: Yes the J.B. Weld doesn't look too good but I will sand it or file it when it dries :) .
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Unread postAuthor: bigbob12345 » Sun Feb 17, 2008 10:24 am

That looks like a nice gun.
although the burst disk size may be constricting flow.
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Unread postAuthor: Sticky_Tape » Sun Feb 17, 2008 10:26 am

Also here is the open union.
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Unread postAuthor: Sticky_Tape » Sun Feb 17, 2008 10:30 am

Well, the burst disk is pretty much the same size as the barrel and isn't it like the larger the diameter of the burst disk the thicker it has to be to hold the same pressure? And it was olny 3 bucks (the union).
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Unread postAuthor: bigbob12345 » Sun Feb 17, 2008 10:35 am

I mean the barrel, burst disk, and the pipe leading to the burst disk.
Im guessing its 1/2in and the chamber is 1.5in.I would recomend a 3/4in union over that.
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Unread postAuthor: Sticky_Tape » Sun Feb 17, 2008 11:45 am

The barrel is .5 inch and the chamber is 1.25 inch 25 more minutes!
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Unread postAuthor: Sticky_Tape » Sun Feb 17, 2008 12:35 pm

Well I tested this gun I put in 7 layers of foil and it bursted at 140 psi I made darts so I'll get damage pictures soon
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Unread postAuthor: Sticky_Tape » Mon Feb 18, 2008 7:36 pm

I'm not sure if I want to keep this a pneumatic I don't like that it doesn't have a trigger I might make this into a combustion maybe a hybrid.
And can someone tell me the formula to get a X mix I don't get the mixes of course that must be because I'm 13. :)
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Unread postAuthor: rp181 » Mon Feb 18, 2008 7:55 pm

X means multiples. Say you put in 1cc of propane in a 3cc container usally. You would just put 2cc of propane and 6 cc of air into the same chamber. Of course you want to find the right stoichometric mixture.
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Unread postAuthor: Sticky_Tape » Mon Feb 18, 2008 8:01 pm

Oooooo ok I didn't know that do you know how I could make that gun into a hybrid or combustion? Do you think that it would be ok if I left the union on for the cumbustion? would that alow more pressuer to build up and then burst the disk?
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 18, 2008 11:52 pm

spudchucker wrote:I left the union on for the cumbustion? would that alow more pressuer to build up and then burst the disk?


Some people would argue it would, some would argue it wouldn't.

To turn it into a hybrid all you need really is an ignition source. You can meter the gas in with a syringe, close it up, the pressurise it, and there you have it.
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 2:27 pm

What is the best ignition sourse?
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 19, 2008 2:30 pm

Image

cheap and easy to find
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Unread postAuthor: Sticky_Tape » Tue Feb 19, 2008 3:54 pm

how would you use that for a cumbustion or hybrid?
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 20, 2008 7:19 am

you need to break it apart and take out the piezo ignitor:

Image

Then all you need to do is hook up the wire and brass bit to two points inside your chamber, in your case with a metal chamber the contact areas with the chamber have to be insulated.
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