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Mini M203

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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Mini M203

Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 12:24 pm

Here is a mini m203 I made recently.

1 1/4" parts.
1/2" barrel.
Fill valve is an 1/8" Schrader.
Exhaust valve is a 1/4" pop-off.
Rubber sheet for diaphragm.

No test fires yet, waiting to glue to cure.

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Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 2:04 pm

I couldn't resist... I just looked so shiny sitting there on my table.

All I can say is wow... this thing scared the fork out of me. It is freakin LOUD!! This little packs a heck of a punch. It shot a nerf dart so fast I couldn't see it!
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Unread postAuthor: )DEMON( » Fri Sep 01, 2006 2:07 pm

Very nice work, you should add a handle to it though. Aslo add some kind of trigger to the valve. Shoot that soda can which is in the picture.

How long is your barrel?
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Unread postAuthor: schmanman » Fri Sep 01, 2006 2:08 pm

nice. cool, and a lot of power for the size, because It's a diaphragm valve cannon. (obviously)
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Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 3:33 pm

Oh, the barrel is probably about 5 inches.
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Unread postAuthor: schmanman » Fri Sep 01, 2006 4:22 pm

attach a string or a cable to the pop off valve, then drill a hole straight through the top of a water bottle. then cut a hole in the bottom for the barrel, and cut the barrel off flush. then it would be disguised as a water bottle. to fill it, you could unscrew the top of the water bottle, and hook up a little bike pump, one of the ones that you mount on a bike frame (concealable) and hook it up, then pump it up. that would be slick. a concealed diaphragm cannon. tip the bottle up to take a drink, then pull the string.use It to fire peanuts at sporting events.
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Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 5:06 pm

hehehe good idea.

I shot a glass marble at my shed. It didn't hurt it but it bounced back real far. I also shot water. It was awesome but screwed up the gun. I had to dry it before it worked again.

I'm actually really impressed with this thing1
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Unread postAuthor: schmanman » Fri Sep 01, 2006 5:20 pm

that's cool. what did you make the diaphragm out of? Is that krylon fusion?
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Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 7:05 pm

Yeah, it's fusion. I made the diaphragm out of those cheap bathtup stoppers from home depot. I already burst one at 90 psi.
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Unread postAuthor: Velocity » Fri Sep 01, 2006 7:09 pm

Cool idea for the concealed gun in the waterbottle... i am definitely going to have to try that now!

I wouldn't cut anymore of the barrel off... 5" is VERY short, and cutting anymore off would lead to significant power loss. Good idea using a diaphragm; I heard they work better than pistons for short barrelled guns
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Unread postAuthor: Benny » Fri Sep 01, 2006 8:33 pm

Love it, could you post some damage pics?
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Unread postAuthor: schmanman » Fri Sep 01, 2006 8:42 pm

you would pull the string hooked up to the pop off valve trough the hole drilled on the top ( just to clarify because I hadn't explained It in my previous post )
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Unread postAuthor: Velocity » Fri Sep 01, 2006 9:44 pm

Its official: I started building one of these today! PVC arsenal, its just such a cool idea! I dont have any threaded plugs near me (only cleanout caps), so I build one myself with PVC rod and a male adapter.

Mine is going to be 1.5" pipe, with either a 3/4" SCH 80 CPVC barrel or a 1/2" SCH 40 barrel (leaning towards the 1/2", only because I don't paintball)
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Unread postAuthor: singularity » Fri Sep 01, 2006 10:46 pm

i dont know this for sure but isn't cpvc weak and shouldn't be put under pressure.
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: PVC Arsenal 17 » Fri Sep 01, 2006 11:02 pm

I beleive the rating of 3/4 cpvc is around 280 psi but not sure.

Good luck with it though!

Quick tip: grind down some 1" pipe to slip into the plug. This thickens it up a bit so the diaphragm won't get sucked in as easily.
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