Phew! That's a mouthful of a name.
It's been far too long since I've posted an Instructable. But rather than list a bunch of excuses, let's get started on today's project.
My latest airgun build follows a design called a cascade failure double burst disk system.  This is the most powerful and efficient gun I've built yet, and is relatively cheap: the whole thing cost less than 40 USD for me.

If you want to make something more efficient, powerful, and unique than the generic ball-valve, diaphram, or piston gun, try looking into burst disk pneumatics and designs such as this one.

PLEASE do not try this if it is your first cannon/airgun build. I will not be held responsible for injuries involved around building, testing, or shooting this design.  Failure to do research can lead to exploding pieces and severe injury.  This Instructable has been written by an experienced builder for others seeking new designs and challenges, not novices.

Special thanks to Spudfiles for having so much knowledge available. I built this gun after reading on that site for about four days!
Thanks also to jackssmirkingrevenge on Spudfiles for answering my questions about designs and linking me to more info.

Side note: I'm not sure what category this should go into. Anyone have some suggestions?

Step 1: What Is a Burst Disk? What Is Cascade Failure?

Quite simply, burst disks are one time use valves, extremely efficient at dumping air. Fast.  It does what it's name suggests - once it reaches a high enough pressure, the flat disk material ruptures and releases the pressurized air behind it. For more specifics, visit the spudfiles wiki: http://www.spudfiles.com/spud_wiki/index.php?title=Burst_disk

The pressure at which a disk ruptures can vary depending on material and diameter.  Aluminum foil is a decent, easy to obtain material and 1/2" disks will be used for this Instructable.  Other things, such as plastic plates, duct tape, plastic sheets, and soda cans can also be used depending on the cannon design. A piece of tape 6mm in diameter can take over 300 PSI without bursting! You'll most likely want to experiment with materials and multiple layers if you create your own cannon design. To see a sample list of disk materials and breaking pressures, visit: http://www.spudfiles.com/spud_wiki/index.php?title=Burst_disk_material

Cascade failure is the use of taking multiple disks and letting them set each other off using a domino effect, taking advantage of pressure differences in a system. Because this is more complicated to explain in text, please view this link for more info and pictures:  http://www.spudfiles.com/spud_wiki/index.php?title=Triggered_burst_disk

I recommend doing some research and skimming through the Instructable before building. It may be a good idea in case you wish to change the design.
<p>Instead of the tubing and the top pvc pieces getting in the way of your viewing the target, try this. Instead of using the trigger chamber 4-way junction, use 2 3-way junctions and a short piece of pipe to connect them. Turn the rear 3-way, with the tubing, to one side, and the pressure chamber 4-way junction horizontally. This would also add stability. Turn the hose attachment to either the same side as the trigger hose outlet, or to the opposite side, with the hose going underneath. That would give you a smooth top, and you could even mount a scope, too.</p>
<p>Great job. I saw this and wanted to make my own. I made an instructable for my version. Made some changes to your design. Thought you might like to check it out.</p><p><a href="https://www.instructables.com/id/Dual-Burst-Disk-Cannon-Trigger-chamber-assembly/" rel="nofollow">https://www.instructables.com/id/Dual-Burst-Disk-Ca...</a></p>
If you want a more secure Schrader valve, AutoZone and similar stores sell ones that are threaded and have a nut that secures it from the outside, so it's bolted in place with a rubber washer to seal the hole. I believe they're rated at somewhere around 100-150 psi, and they look great because they're chromed and shiny.<br> <br> These would work: <a href="http://www.autozone.com/autozone/accessories/Mr-Gasket-4-pcs-straight-short-screw-on-mount-chrome-tire-valve-stems/_/N-25cj?itemIdentifier=125882_0_0_" rel="nofollow">http://www.autozone.com/autozone/accessories/Mr-Gasket-4-pcs-straight-short-screw-on-mount-chrome-tire-valve-stems/_/N-25cj?itemIdentifier=125882_0_0_</a>
interesting burst disk system, I didn't know burst disks can be used in air cannons, thought they are only used in hybrid ones.
Yeah I thought the same, so I did some research ;)
This reminds me of the blowguns my friends and I made, but times 200. Awesome
Informative, and I like the design with the slide loader.<br /> <br /> <sub><em>(Also, as the Editor of Play, Offbeat is the channel where awesomeness like this belongs!)</em></sub>
Thanks! I'm glad I stuck it in the right category.
Might design a magnetic flap valve type thing (reusable burst disk(ish type thing))
how do you make the nail dart ammo?

About This Instructable




Bio: AKA Roborovski, and Cowscankill for several years. I'm a mechanical engineering undergrad.
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