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pico BBMG - 1mm calibre HPA

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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Unread postAuthor: jackssmirkingrevenge » Tue Jun 15, 2010 12:41 am

POLAND_SPUD wrote:try an inline cloud built from a pipe nipple... mine is quite reliable


These tiny BBs are remarkably fidgety, I mean when it goes it goes, the rate of fire when it is working makes me find comfort in the fact that the ammunition is so cheap. I've tried all manner of vortex blocks of different sizes and cloud configurations - seriously, I'm on prototype N<sup>o.</sup> 8 at the moment - none of them so far give me a reliable burst every time I open the valve, and for a sentry gun that's not something I can accept.

My latest version currently curing looks something like the diagram below, I'll see how well it works later this afternoon.
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Unread postAuthor: POLAND_SPUD » Tue Jun 15, 2010 5:50 am

so the input is very close to the output (barrel port)?

mine looks like this... all built from standard iron and brass fittings

ohh and I also have some pics of the adjustable rubber washer holder... it is pretty much as simple as it gets
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 15, 2010 6:03 am

The problem with that design on this scale is that no matter what the input flow is, the output is restricted to the 1mm barrel, so you're not going to agitate the BBs enough to make a conventional cloud work well. With the current design I'm hoping that there will be enough turbulence close to the breech to stop the BBs jamming, while gravity should keep the mass of BBs in the general area of this turbulence. Testing in a couple of hours, we'll see.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 03, 2010 1:50 pm

Another attempt at making this work reliably, this time with a neodymium magnet added. This not only serves as a detent but effectively draws BBs into the breech even without any airflow. Prototype is curing, watch this space...
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Unread postAuthor: woodscout » Sat Jul 03, 2010 3:38 pm

looking good JSR, the waiting is the badest thing about epoxy :wink:
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Unread postAuthor: Zeus » Sat Jul 03, 2010 6:55 pm

I think you may have some problems with the Nd magnet. I hope you
know how strong they are. However a toroidal magnet may help if it
was placed around the barrel.
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Unread postAuthor: Insomniac » Sat Jul 03, 2010 7:56 pm

Haha, I misread the title of this topic as '1mm calibre PITA'


Sounds like it ain't too far from the truth :D
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 04, 2010 12:57 am

Zeus wrote:I think you may have some problems with the Nd magnet. I hope you
know how strong they are.


The construction is such that BBs cannon go back into the ball valve because of the restrictors I placed in the tubing, so thankfully the scenario in your diagram can't happen. I did some tests dropping BBs bear the breech area and they were sucked into the barrel instantly if close enough, there is no other magnetic element in the firing chamber except the top bolt and nut for filling (ball valve and all piping is brass/aluminium) and I have high hopes for this thing. Couple of hours and we'll see if they are justified...

Haha, I misread the title of this topic as '1mm calibre PITA'

Sounds like it ain't too far from the truth


Considering I've been at this for months, it's a pretty accurate description :roll: :D
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Unread postAuthor: POLAND_SPUD » Sun Jul 04, 2010 1:57 am

I've tried using tubing as a magazine... a short length of 6mm ID tubing was completely enclosed in the chamber but it didn't work well.. I realized I have to cut holes in it close to the detent

.....OMG I have a terrrrrrrrrrrrrrrible hangover :x
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 04, 2010 2:02 am

POLAND_SPUD wrote:.....OMG I have a terrrrrrrrrrrrrrrible hangover :x


But still on spudfiles... mark of a true spudder :D
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Unread postAuthor: POLAND_SPUD » Sun Jul 04, 2010 2:47 am

yeah... well it's even worse than just that - when I woke up my left hand was covered in blood... ohh yeah and I don't remember how I got home... damn
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Unread postAuthor: Insomniac » Sun Jul 04, 2010 3:32 am

Haha Poland that makes two of us :D

Though by the sounds of things your night was bigger than mine...
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Unread postAuthor: jackssmirkingrevenge » Sun Jul 04, 2010 3:36 am

POLAND_SPUD wrote:yeah... well it's even worse than just that - when I woke up my left hand was covered in blood... ohh yeah and I don't remember how I got home... damn


Sounds like most of my weekends :D not this one though, been a heavy week so I decided my liver deserved a weekend break :)
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Unread postAuthor: SpudBlaster15 » Sun Jul 04, 2010 4:34 am

POLAND_SPUD wrote:when I woke up my left hand was covered in blood...


There's likely 2 ways this could have happened... One of them is considerably more R rated than the other. :lol: :D
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Unread postAuthor: blind909 » Sun Jul 04, 2010 4:36 am

More like considerably more X rated :wink: And i like the gun JSR
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