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How to connect 6 mm pipe with ball valve?

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Unread postAuthor: Pete » Thu Apr 14, 2011 9:59 am

Power: What you get out of a standard compressor, I think 8-10 bar
Size: Like a normal hunting gun, so it looks like real
Shots: 10-20 (but I can go with less if the chamber would be too big)
Money: Not more than 50 bucks for the metal parts

i thought I take the design here mentioned:
- 6 mm inner diameter barrel with epoxy in a reducer
- air pistol with epoxy in a reducer
- both reducers connected
- air pistol connected with a tube to a chamber (a pipe with two end caps)
Materials will be aluminium for the barrel, iron for the chamber and brass fot the reducers and connecters. Air filling will be solved through quick disconnects.

Is this plan okay?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 14, 2011 10:24 am

I think this design by lozz08 is a perfect design for you to base your project on.

Of particular importance is the o-ring between the "air pistol" (blowgun) and the barrel, because this holds the BB enough for pressure to build up behind it, as well as lowering rate of fire to an extend which makes semi-auto practical.

Also note that he uses a relatively small metal chamber but filled with a shock pump to around 25 bar, giving him a good number of shots.
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Unread postAuthor: Pete » Thu Apr 14, 2011 10:53 am

The O-Ring is in front of the bb, right? So the bb does not get out too quickly?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 14, 2011 11:01 am

Exactly. A blowgun is not a perfect valve, but keeping it in the breech until pressure builds up improves performance significantly.
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Unread postAuthor: Pete » Thu Apr 14, 2011 11:26 am

But how to attach an O-Ring between blowgun and barrel? I want to load the gun though a hole covered by another pipe, then the O-Ring thing is not possible?!
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 14, 2011 11:40 am

Sandwich ;) that way, the more you tighten the fittings, the more the o-ring will hold the BBs
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Unread postAuthor: Pete » Thu Apr 14, 2011 12:24 pm

You mean I should screw the barrel to the blowgun?
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Unread postAuthor: Crna Legija » Thu Apr 14, 2011 12:46 pm

You get two fittings, like a cap and nipple. Drill a hole in the cap the size of your barrel and glue it in place. Then sandwich a peace of rubber with a hole a tiny bit smaller then your ammo in between the fittings. You can adjust the pressure needed to pop the bb out by tightening/loosening the fittings. Connect the back half of the nipple to you blowgun.
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Unread postAuthor: Pete » Thu Apr 14, 2011 1:13 pm

Thank you for the description ;)
Now I've got it :D
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