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Double Shot (High Pressure Mini)

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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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 6:25 pm

Thanks Solar, what size valve does the piston above actuate?
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Unread postAuthor: Solar » Mon Nov 05, 2007 7:57 pm

It has a 1" port. The picture shows both the piston actuator and the valve. The air intake is at the threaded end you see, and the output it through the turned down area with the omni directional holes. A manifold slips over the o-rings to direct the air through the barrel.
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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 8:23 pm

What kind of sights do you think i should use on my gun? Any ideas welcome.
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Unread postAuthor: ammosmoke » Mon Nov 05, 2007 8:44 pm

Carefully and neatly JB weld a nut horizontally on the front after measuring out where the center is. Then, put an eyescrew in it. For the rear, put another nut, but smaller, and then a screw. This way, you can adjust the sights. However, you couldn't adjust them laterally.... Maybe use neomidium magnets with the setup glued on to them? Nice neomidium magnets are super strong, and not likely to get pulled off with anything short of a pair of plyers. Then they would be stuck to you pliers.... :lol: However, you could probably still slide them.
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Unread postAuthor: octane89 » Mon Nov 05, 2007 8:44 pm

Very nice, and I have a few questions...
-Where on earth did you get a gold chamber like that?
-What are you using as ammo?
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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 8:48 pm

Novacastrian wrote:
HaiThar wrote:Very Nice build. I love the gold plate. Where did you get the chamber from?


At the local scrapeyard, sadly it was closed down about 1 month ago :cry:


Edit: The ammo i use is like the blue one in the pic Image
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Unread postAuthor: octane89 » Mon Nov 05, 2007 8:54 pm

Thanks. Now I guess I need to buy some spray paint.
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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 8:56 pm

My tip would be to go to a lighting store, i think the pole i used was an ex light fitting pole thingy.
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Unread postAuthor: ammosmoke » Mon Nov 05, 2007 9:32 pm

Than wouldn't that mean it won't hold much pressure.....?
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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 9:39 pm

Any aluminium that dia with a wall thickness of 3mm should be pretty good at holding pressure.
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Unread postAuthor: octane89 » Mon Nov 05, 2007 9:51 pm

Well steel can easily hold a few hundred psi, and since the aluminium isn't a large ID it should be fine around 100psi.
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Unread postAuthor: Novacastrian » Mon Nov 05, 2007 9:56 pm

I am going to test it past 300psi. Just think about how much pressure a soda bottle can hold (150psi) The weakest part of my chamber would be where the gauge goes in= don't point gauge towards face whilst pumping. I might test it with water.
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Unread postAuthor: jackssmirkingrevenge » Tue Nov 06, 2007 12:48 am

Novacastrian wrote:What kind of sights do you think i should use on my gun?


How about epoxying a dovetail plate to the top of the chamber and fitting one of these?

Cheap and well suited to spudgun applications :)

Even simpler would be to make up some adjustable iron sights - even with my limited facilities I managed to make some for this launcher, so with what you have at your disposal it should be a piece of cake.
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Unread postAuthor: ammosmoke » Tue Nov 06, 2007 1:27 am

Oh, I didn't see the part about it being 3mm thick.
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Unread postAuthor: Solar » Tue Nov 06, 2007 1:30 am

should be around 3000psi for 6061 I think.
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