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Some questions about burst disk...

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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Some questions about burst disk...

Unread postAuthor: Demon » Tue Sep 30, 2008 3:34 pm

I want to make a burst disk spudgun(they are pretty powerful)

And i wanna know:

Does a cam lock make a good burst disk holder?

Does someone knows about a electricly activated piston(to break burst
disk)?

Thanks answering

ps: my english s$%ks...
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Unread postAuthor: marpat » Tue Sep 30, 2008 3:43 pm

cam locks work decently

and as far as the electrically activated burst disks i know people on here have taken an electric ram and put a broad head on the tip to pierce the burst disk
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Unread postAuthor: mark.f » Tue Sep 30, 2008 3:56 pm

That was actually a pneumatic ram, but the principle is the same.
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Unread postAuthor: psycix » Tue Sep 30, 2008 4:05 pm

For mortar style cannons it also works pretty good to make a sharp pin at the butt of your projectiles and thus the burst disk bursts as soon as you drop a projectile down the barrel.
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Unread postAuthor: clide » Tue Sep 30, 2008 5:34 pm

You can also electrically trigger a burst disk by using a plastic disk and a heating filament. JSR built one using this method a while ago.
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Unread postAuthor: Demon » Tue Sep 30, 2008 6:31 pm

cam locks work decently


how much psi can they hold?
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Unread postAuthor: starman » Tue Sep 30, 2008 6:38 pm

Demon wrote:
cam locks work decently


how much psi can they hold?


The plastic ones are rated at 150 psi, metal ones 250 psi. From my experience with these, these numbers are reasonably conservative.

Check out my triple thunder combustions. I used multilayers of blue masking tape as the burst material.
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Unread postAuthor: Demon » Tue Sep 30, 2008 6:47 pm

When i was to rona, i founded a metal 1 1/2 camlock and see then the mecanism was simple:two levers hold the pipe in piece, so normally air would pass around the burst disk where there is no levers... does it does?
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Re: Some questions about burst disk...

Unread postAuthor: jackssmirkingrevenge » Tue Sep 30, 2008 9:38 pm

Demon wrote:Does a cam lock make a good burst disk holder?


Yes ;)

Does someone knows about a electricly activated piston(to break burst
disk)?


As clide mentioned you can have a loop of nichrome wire sandwiched between two burst disks and have it melt the disks when current is passed through it, however I found this to be tedious and inconsistent to use.
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Unread postAuthor: Demon » Wed Oct 01, 2008 6:48 am

Demon wrote:
Does a cam lock make a good burst disk holder?



Yes


For the burst disk, i am talking of 6-8 foils of aluminium paper...does this way to make burst disk works on the camlock?

To what a camlock looks? how does it work exactly?
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 01, 2008 7:22 am

Demon wrote:For the burst disk, i am talking of 6-8 foils of aluminium paper...does this way to make burst disk works on the camlock?

To what a camlock looks? how does it work exactly?


Yes you should be fine with foil.

Image

Females on the left, males on the right. The two arms with rings in them swing back to lock the cams into the the ring around the end of the male section, easy.
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Unread postAuthor: Demon » Wed Oct 01, 2008 3:29 pm

If it is so easy, why nobody use camlock to make burst disk holder???
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Unread postAuthor: jackssmirkingrevenge » Wed Oct 01, 2008 4:48 pm

Demon wrote:If it is so easy, why nobody use camlock to make burst disk holder???


nobody? ;p
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Unread postAuthor: Demon » Wed Oct 01, 2008 5:07 pm

Ok... but not alot of people use it :tongue7:
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Unread postAuthor: psycix » Thu Oct 02, 2008 11:01 am

1-Because not everyone can buy one in the local hardware store
2-Unions are higher rated, and most hybrid (and pneumatic) cannons need that rating.
3-Because of that rating camlocks are only suitable for combustions or low ti medium-pressure (not more then 150psi) pneumatics, and there simply are not many combustions or medium pneumatics around since burst disks are usually used for extreme cannons. (ultimate valve)
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