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My new updated Air gun - (350psi)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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My new updated Air gun - (350psi)

Unread postAuthor: ham_machine » Sat Sep 27, 2014 3:29 am

I have built a new air-gun, very similar to my old one, however this one is much stronger and durable. My old one can be found here - http://www.spudfiles.com/pneumatic-cannon-database/topic25658.html


converted2.jpg
My gun looks quite different now, as I have recently fiber-glassed the pipe work at the back.


It consists of a powder fire extinguisher used as a stock, which I transfer the pressure into the second chamber (consisting of copper pipe). The pressure is held into the second chamber by the ball valve - this is connected to a hook (with a bolt attached) and a spring. As I pull back the bolt (located at the front, in the wood), this pulls back the hook which pulls back the ball valve. Once the ball valve is in a closed position the hook will have hooked onto the trigger. Releasing the trigger basically does this all backwards, opening the ball valve very quickly.

Hard to describe with words alone, Here is a video to help better illustrate it. -
[youtube]https://www.youtube.com/watch?v=6XHvkMVB5mM&list=UU4OC1H9V3l0gcG6k_cRV8sQ[/youtube]

https://www.youtube.com/watch?v=6XHvkMV ... G6k_cRV8sQ

In this video I am using 240psi, as that was the maximum pressure my old pump could withstand. However, since making this video, I have brought myself a new pump capable of 350psi. I have 7 shots, (the 7th shot has a pressure of 200psi) So even that is immensely powerful. It takes perhaps 3-5 seconds to reload between each shot (which includes loading in the ball bearing) - This is with my new loading mechanism which I will upload in the near future, and is very cool to watch.

converted3.jpg
Trigger mechanism.


I have also fiber-glassed the entire back section of the copper pipe and fire extinguisher, this creates a seamless finish which I will eventually paint..(and hides my shoddy puttying and epoxy). The wood at the front is black walnut (wasn't cheap either..) I plan to make this look much much better, more durable and more professional looking.

converted4.jpg
Black walnut (not cheap stuff)! Notice the hairline gap where the wood was jointed. I sawed (by hand) 2 cuts along the length of the wood until I had 3 planks, removed material from the middle plank, then stuck them back together.


converted5.jpg


converted6.jpg
A Quick-Connect fitting, used as an alternative way of re-pressurizing.
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ham_machine
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Re: My new updated Air gun - (350psi)

Unread postAuthor: Tinodedino » Mon Jan 12, 2015 1:27 pm

can you explain the working of the trigger mechanism a bit more or maybe show picture/schematics? I don't really understand it yet.
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