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Semi-auto .402 cal work in progress

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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Unread postAuthor: JDP12 » Mon Feb 20, 2012 10:08 pm

Well just tested it with a CO2 cartridge and the original piston... worked fine, no leaks. So all thats left is to make a body for this, and eventually a magazine.
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 21, 2012 12:23 am

Told you :) a few people laughed a few people cried most people were silent i remembered the line from the hindu scripture
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Unread postAuthor: JDP12 » Tue Feb 21, 2012 12:31 am

haha. indeed you did o wise JSR.

cuz i can't resist the urge of shooting something, took a few shots while it was at max power, even though it was a 3/8" bearing, so there was considerable blow by. At 10 feet or so, managed to penetrate a 1/4" into a 1" particle board. So hopefully when I make an airtight projectile, power will be better.
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Unread postAuthor: JDP12 » Sun Feb 26, 2012 12:11 am

Started making actual projectiles today..

I'm sorry for the terrible quality of the picture I couldn't get it to focus on it to save my life.

It's pretty basic, just a short section of the barrel is lubed up, the ball bearing is dropped in and epoxy is poured into it.

Haven't test fired it yet, but it should give a good airtight seal and will be pretty easy to feed via magazine eventually.
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 26, 2012 12:13 am

Looks good :) I'd be concerned about the BB breaking off on firing though if you haven't roughened the adhering surface.
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Unread postAuthor: JDP12 » Sun Feb 26, 2012 12:31 am

it just broke off before even firing... so I will have to roughen the adhering surface of the Ball bearing for the next one.
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Unread postAuthor: inonickname » Sun Feb 26, 2012 10:26 am

I'd really rough it up..drill a hole if you can.. bastard cut file/grinder as well
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Unread postAuthor: Zeus » Sun Feb 26, 2012 8:26 pm

Make sure there's no grease or lube on it too. Hit it with a blow torch to burn it off.
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 27, 2012 1:38 am

... or just avoid using BBs altogether ;)

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