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1mm BBMG x 3

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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1mm BBMG x 3

Unread postAuthor: jackssmirkingrevenge » Mon Jun 21, 2010 11:39 am

My latest in a series of attempts to make an acceptable BBMG for my sentry gun project.

In order to cope with the chronic reliability problems, I figured I'd triple my chances for success, by fitting 3 barrels. It solved the reliability problems alright, shoots every time the valve is opened - the problem is that due to the shorter barrel length and increased flow through the barrel for the same input valve, power has suffered, it won't punch through a simple CD... back to the drawing board.
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Attachments
front.JPG
3 times the fun :D
side.JPG
attached to my 48cu Ninja tank with a remote line
target1.JPG
looks quite devastating, but...
target2.JPG
no penetration, the shape of the CDs is neatly stencilled on the polystyrene backing.

Kinda looks like boobs. lol.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: deathbyDWV » Mon Jun 21, 2010 1:10 pm

Haha... Now that's an idea. Even though you're wasting alot more air, I'm guessing the super small caliber makes up for it... I might have to make one...

BTW what pressure are you running at?

Yes the stenciled CDs look kinda like boobs... :roll: :P
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 21, 2010 1:15 pm

deathbyDWV wrote:Even though you're wasting alot more air, I'm guessing the super small caliber makes up for it...


The great thing is that the ammunition is so cheap, and with a good magnet and some patience you can recover most of them if firing indoors.

what pressure are you running at?


850 psi, at such a small calibre you can't really afford to run at anything less for decent power.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: JDP12 » Mon Jun 21, 2010 5:11 pm

Very interesting.. Makes sense why power would suck tho.
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 21, 2010 11:45 pm

JDP12 wrote:Makes sense why power would suck tho.


Yep, these 1mm BBs really are on the limit, the shorter barrel(s) was certainly a miscalculation.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: Insomniac » Tue Jun 22, 2010 3:18 am

Do you intend on retrying it with longer barrels? How about a twin barrel setup?
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 22, 2010 3:42 am

Insomniac wrote:Do you intend on retrying it with longer barrels? How about a twin barrel setup?


So far I've been working with 30-40cm barrels, on this particular prototype I've halved that to 15cm, with predictable effects.

A twin barrel oerlikon style would certainly be sexy but I think I would rather go for a single long (say 60cm) barrel, possibly with a neodymium magnet "detent" (though I'm not sure if this would interfere with BB agitation and feeding in a positive or negative manner, only one way to find out...), in order to maximise power. It will limit the places I can set up the turret indoors, but the power increase should be worthwhile.

If firing at fast-moving targets, the concentrated firepower advantage of the BBMG is lost so single-round energy is important, and that's what I'd like to go for, even if it's at the expense of compactness and rate of fire.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: Insomniac » Tue Jun 22, 2010 5:04 am

Hmm, so you're abandoning the multi-barrel concept? How are you going to fix the feeding problems you were having before?
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I wonder how much deeper the ocean would be without sponges.
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 22, 2010 5:39 am

Insomniac wrote:How are you going to fix the feeding problems you were having before?


I guess I'll just have to grin and bear it, I've managed to improve things by flaring out the breech end and "loosening" the bore by spinning a length of 1mm piano wire through the barrel.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: jhalek90 » Tue Jun 22, 2010 6:08 am

jackssmirkingrevenge wrote:
If firing at fast-moving targets, the concentrated firepower advantage of the BBMG is lost so single-round energy is important, and that's what I'd like to go for, even if it's at the expense of compactness and rate of fire.


Single round energy? With a 1mm round? i had to laugh out loud there.

Its just a funny concept, trying to boost muzzle energy of a round that weighs so little.

Any ways, glad to see this project coming along.

Keep up the good works.
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 22, 2010 6:27 am

jhalek90 wrote:Single round energy? With a 1mm round? i had to laugh out loud there.


Well, it's all relative :P in this case if I get a single round to punch a clean hole through a CD or a beer can it's what I'd call "powerful" :D

In this case, due to the fabled "jackhammer effect", at close range a burst from this thing will easily obliterate a CD, but only due to the repeated effect of multiple hits on a small area, which is not what I'm after.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: psycix » Tue Jun 22, 2010 7:52 am

Sandblaster :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 22, 2010 9:13 am

psycix wrote:Sandblaster :D


In this case I'll grudgingly have to agree with you :P
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Unread postAuthor: Brian the brain » Fri Jun 25, 2010 3:51 pm

Wow...1mm bbmg..sawed-off version.

:D




Now tell me size doesn't matter....

I think you are also loosing a lot of pressure through the open barrels.
Even though they load a projectile in a split second, a singular bbmg is already a gas guzzler.

You have just multiplied it by three..Wich means gas is gushing out to fast compared to what's coming in...so you lost alot of pressure.
I can imagine a triple barrel like that would load less efficient.

The bernoulli ( sp?) effect these bbmg's are based upon is also lessened.
Gas can flow out " a" hole three times the size of the ammo.

Basically I think you would have the same kind of power you have now, if you took a barrel with 3 times the the cross-section area as the ammo and just fired 1mm bb's out of it.
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Unread postAuthor: psycix » Sun Jun 27, 2010 8:33 am

So multiple barrels make it less efficient... Maybe you should go the other way and use 1/3rd barrels. :roll:
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