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Bearing Barrel

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Bearing Barrel

Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 1:38 pm

I'm working on full auto, so I decided to get a more precise ammo than marbles. I would like to use either 1/2" or 3/8" bearings because they are the cheapest, but I'm having the hardest time finding pipe with an ID of 1/2" or 3/8". Anyone got any suggestions for the barrel/magazine material? note that it has to fit together with standard pipe fittings
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Unread postAuthor: saefroch » Sun Dec 05, 2010 2:17 pm

3/8" NPT pipe has an ID of .495" with a small lip on either side. Grind out the lip, and 1/2" ball bearings should fit pretty close. If it's too small, you can machine something that's a very tight fit and just wear down the inside to shave off .005".
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 2:43 pm

I have a .5" drill bit, but its about 4" long, so that probably won't do...

PS, could an air ram keep up with full auto?
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Unread postAuthor: saefroch » Sun Dec 05, 2010 2:50 pm

A .5" drill bit will usually drill a hole wider than .5" because of the precession of the drill. I'd use the drill bit and just push it back and forth through the pipe once you remove the lips on the ends.
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 2:57 pm

just as a test, I just drilled a hole in a piece of HDPE, it fit the bearing perfectly, but it gave me another idea: I use 8705K331 (.5" ID HDPE tube) and hand machine a loading block with 8671K49 (Block of HDPE) The stuff is so easy to machine that I could do it with a hand drill. anyone with experience boring holes, do spade bits work well?
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Re: Bearing Barrel

Unread postAuthor: POLAND_SPUD » Sun Dec 05, 2010 3:00 pm

Lockednloaded wrote:I'm having the hardest time finding pipe with an ID of 1/2" or 3/8". Anyone got any suggestions for the barrel/magazine material? note that it has to fit together with standard pipe fittings

get either 10mm aluminium or 13mmID copper barrel
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 3:05 pm

I can't get either on mcmaster :( , BTW POLAND_SPUD, IIRC, you mad a 3D diagram for your loading block, can I get a link to that? and also aimed at you, would an air cylinder work with a QEV+Pop-Off design?
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Unread postAuthor: POLAND_SPUD » Sun Dec 05, 2010 3:26 pm

nope it won't work
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Unread postAuthor: Lockednloaded » Sun Dec 05, 2010 3:38 pm

Thanks POLAND_SPUD, I'll probably work with the detent or try a blowback kind of thing
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