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I'm gonna build a BBMG, too

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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I'm gonna build a BBMG, too

Unread postAuthor: Hubb » Wed Mar 26, 2008 7:48 pm

The construction of my hybrid meant that I have gained experience for every type of launcher here, that is, except for a BBMG. Construction has began on my revolver, pump action, paintball thingy (I need a name...) so I can start plans on one.

Before I do, however, I have a few questions:
1) I'm gonna place a vortex block in it instead of making a cloud. Which type of block is better, one that is completely rounded or one that is half rounded?
2) I plan on using unregulated CO2 for insane rates of fire. I will build (or buy) an expansion chamber for it. What material should I use for the vortex block.
3) I would assume that, since it will have a constant air source, any length of barrel will suffice. Is this correct or is there some type of barrel to something ratio I need to be aware of for the best shots?

I believe that is it for now. Thanks in advance.
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Unread postAuthor: STHORNE » Wed Mar 26, 2008 7:53 pm

1)Heres a good tutorial on how to make a decent vortex block
2)Automotive Bondo
3)2:1 is optimal in my perspective
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Unread postAuthor: Hubb » Wed Mar 26, 2008 8:04 pm

I have the resources to make one. I was just wondering if a full circle or half circle is better. As far as using the bondo, will it hold up to that much pressure? I was thinking I would have to build it out of aluminum or something, running unregulated CO2.
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Unread postAuthor: DYI » Wed Mar 26, 2008 8:19 pm

It *shouldn't* build up any significant pressure, unless you're feeding liquid CO<sub>2</sub> through it. If it got jammed somehow though... I'd make the block out of something more sturdy, just to be sure. In the extremely unlikely event of a complete jam, a well made epoxy block should hold. If you have the equipment and skills, there's no harm in using aluminum, but epoxy might be easier.
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Unread postAuthor: Hubb » Wed Mar 26, 2008 8:30 pm

Thanks. What about the half vs full vortex block?
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Unread postAuthor: STHORNE » Wed Mar 26, 2008 8:35 pm

elaborate what you mean by "half or full"
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Unread postAuthor: Mac/pistol man » Wed Mar 26, 2008 8:39 pm

I believe he means the half hole, or full hole inline vortex block.
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Unread postAuthor: Hubb » Wed Mar 26, 2008 8:41 pm

Mac/pistol man wrote:He does mean the half hole, or full hole inline vortex block.
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Unread postAuthor: Mac/pistol man » Wed Mar 26, 2008 8:43 pm

hubb017 wrote:
Mac/pistol man wrote:He does mean the half hole, or full hole inline vortex block.


Lol...
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Unread postAuthor: brother361 » Wed Mar 26, 2008 8:57 pm

i thought bondo wore out quickly
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Unread postAuthor: potatoflinger » Wed Mar 26, 2008 9:29 pm

I don't know much else about bbmg's, but I do know that a shorter barrel will give you a higher rate of fire, but lower velocity, and that a longer barrel will give you a lower rate of fire, but a higher velocity.
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Unread postAuthor: LikimysCrotchus5 » Wed Mar 26, 2008 9:35 pm

From what i have read here on spudfiles, i concluded that it is better to have a half circle only because the bbs dont have to make as many revolutions compared to a full circle.

But this only affects the rate of fire only a little. Besides that, there is really no difference. But dont take my complete word on it because i have never built a bbmg.
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Unread postAuthor: Hubb » Wed Mar 26, 2008 9:38 pm

I'll have to see. It is going to be pushing between 800 and 850 psi and I want it to rip through sheet metal, maybe roofing tin or something.
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Unread postAuthor: Hubb » Thu Mar 27, 2008 11:53 pm

Since I'm using unregged CO2, I have a few more questions.

1) I will build an expansion chamber. It will be a steel pipe, probably 3/4". I've considered filling the pipe with steel wool. Would this make a difference in keeping the liquid out, sort of like a filter, or would I be waisting my time?

2) I sure would like to use the least amount of CO2 I can. The chamber is not going to be too big so that would help. Any more tips on conserving CO2?
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Unread postAuthor: elitesniper » Fri Mar 28, 2008 12:00 am

Uh, don't use bondo, for those pressure, they will ware out really quickly, can you make one out some metal that would be the ideal solution for that kind of pressure.
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