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Airsoft bbmg minigun

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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Airsoft bbmg minigun

Unread postAuthor: colty-bear » Thu Mar 05, 2009 10:54 pm

I'm making a minigun and need help i am going to have 6 barrels that rotate but for looks. the wood block will be over barrels to hold in place. And i will have a hidden barrel that will actually shoot through the bigger hole in the barrel holder it will shoot with vortex like normal vortex gun, I will use 5/16 brake line for barrel. but i need help on how will i make the barrels spin and have the vortex block and bb chamber in middle any ideas?

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Unread postAuthor: PaulsAirsoftArmory » Thu Mar 05, 2009 10:57 pm

Go to air-sharp.com and look at the "616 Screamer Minigun." If you wander around enough, there are plenty of diagrams and pictures that may help you.
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Unread postAuthor: colty-bear » Thu Mar 05, 2009 11:03 pm

It seems like a cool idea and what i want but i don't have enough money
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Unread postAuthor: Davidvaini » Thu Mar 05, 2009 11:18 pm

So what will you shoot out of this vortex? If its airsoft I'd highly suggest an airsoft barrel because brakeline has way too much blowby and with a potential quality build such as this I would think it would be a waste to have a brakeline barrel.
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Unread postAuthor: colty-bear » Fri Mar 06, 2009 12:17 pm

Yea I'v been thinking about that i might take apart my old rifle and take out the tightbore it will be shooting airsoft bbs but how will i make it spin and have chamber in middle to shoot?
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Unread postAuthor: jimmy101 » Fri Mar 06, 2009 2:14 pm

Use the barrel as the bearing that the fake barrels rotate about? I suspect that is what you were planning.

Looks like you've got a 1" or so hole in the barrel holder, so put a piece of 3/4" PVC through that, your barrel runs through the center of that pipe. Neither the barrel nor the ~3/4" pipe rotate.

The rotation mechanism and the vortex mechanism are behind the barrels, where the loading and spinning mechanism would be on a real minigun.

If the 3/4" PVC isn't stiff enough to support the weight of the moving barrels then try similarly sized steel pipe. This assume you are going for a "minigun" look and not a "Gatling" look.

If you don't even want to bother with trying to get the central pipe to support the load, then set it up like the original Gatling gun, which has external braces running from the breach end to the barrel end.

In the photo you can see the external braces that support the rotation point at the front of the barrels.
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If you can find a bearing that matches the OD of the central PVC (or iron) pipe that would be the best way to reduce friction. Two bearing, one at the front and one at the back. A pair of bushings for each bearing so the multibarrel assembly can't move front to back on the central pipe.

To hold the real barrel inside the central pipe ...
I would first see if you can get lucky and find a wood dowel with the same OD as the central pipes ID. If you can get a dowel that is just a bit oversized it can be sanded down to fit. Cut the dowel into ~1" lengths and drill a hole in the center for the real barrel. A couple should be all that are needed to support the barrel in the central pipe.

If you can't find a suitably sized wood dowel then just cut wood squares with diagonal = central pipes ID to use in place of the dowel.

Fiinding suitable bearings may be a PITA. McMaster probably has what you want but your local hardware store probably doesn't. You might be able to get away with homemade non-roller bearings. Just a piece of copper pipe that snugly fits around the main inner pipe. Get the smallest ID copper pipe that is larger than the OD of the central pipe. Cut a 1" length then slice the cylinder open to make it look like a "C". Remove enough material in the slice so the C can be clamped down fairly snug onto the central pipe. Capture that C in your barrel holder. A bit 'o grease and the ghetto bearing should last quite a while.
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Unread postAuthor: colty-bear » Fri Mar 06, 2009 3:39 pm

Alright i may try the brace that goes up to end and holds the barrels and just put barrel through that and for spinning us a belt and small motor that rotates around 1 1/2 pipe and inside 4 pipe and have vortex block and chamber inside 1 1/2 pipe
thx
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