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centrifugal airsoft gun

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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centrifugal airsoft gun

Unread postAuthor: scianiac » Thu Nov 13, 2008 10:09 pm

After seeing the Mythbuster's confederate steam machine gun I considered the idea for a airsoft gun using the same principal. First of all I have condemned this idea temporarily because it is horribly inefficient and would chew through a battery pack pretty quick. It's powered by a Dremel rotary tool that has a max no load speed of 35,000 rpm, but the gun starts to destroy itself when pushed beyond 2/3 throttle. The barrel is made of copper tubing sleeved over a bic pen body. The drive block is made of Azec PVC outdoor molding (it's like a really dense PVC foam). Those four bolts push on a collar the goes around the neck of the Dremel to center it and stop the barrel from rubbing on the guard. One problem is that BBs hit the exit slot and destroy the end of the barrel but for some reason the gun never stops running even when they get jammed. All in all is has lots of flaws but it's current state is what it will stay for some time.

Please respond with questions/comments
If your interested in building something like this I have more information that would be helpful

specs
-------velocity: about 100 fps at 2/3 throttle
---rate of fire: as fast as I can put them in but each shot slows the rpms down
power source: 120v AC (limits mobility to the longest extension cord)
-----accuracy: poor and has hopside
barrel length: 3 in total 1.5 that the BB travels through

[youtube]http://www.youtube.com/watch?v=rNW-EtmWLd8[/youtube]
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Attachments
P1010031.JPG
damage done by BBs getting stuck in exit slot
note:normally the barrel and exit slot are aligned
P1010029.JPG
damage done by BBs getting stuck in exit slot
P1010002.JPG
ammo feeder
note: the tube is pushed through the block on the gun
P1010004.JPG
gun internals
P1010010.JPG
Demel attachment
P1010001.JPG
the gun

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Unread postAuthor: Carlman » Thu Nov 13, 2008 10:24 pm

nice work mate!

prototype over now go for gold
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Unread postAuthor: cowkiller » Fri Nov 14, 2008 12:39 am

when you built your gun did you make a timing device like the mythbusters or is it a drop and let go. if you made a timer system could you post the specs i would like to make one maybe even larger
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Unread postAuthor: newbmatic » Fri Nov 14, 2008 3:43 pm

Sorry, but how exactly does fire the BBs?
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Unread postAuthor: Davidvaini » Fri Nov 14, 2008 3:58 pm

looks good.. always nice to see people try new things...

You could always add a hopper, hook up a remote circuit with it and have it as a mine in an airsoft match :D
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 14, 2008 4:17 pm

I think this project is a much more viable source of inspiration and advice than anything the mythbusters had accomplished in that show ;)

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Unread postAuthor: jonnyboy » Fri Nov 14, 2008 4:37 pm

Nice proof of concept. Get a bigger motor with some decent torque and some fast rpm.
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Unread postAuthor: scianiac » Fri Nov 14, 2008 5:10 pm

That's the part I differed from their design. I thought it would be difficult and unnecessary, but it probably would have solved the barrel destruction and increased velocity. The rounds wouldn't hit the guard and expel some of their energy.

Their has been many designs for such a weapon in the past and even a company that is developing one for the U.S. government.

http://thedonovan.com/archives/2008/03/tidying_up.html
http://strangengines.wordpress.com/category/centrifugal-guns/
http://www.defensereview.com/modules.php?name=News&file=article&sid=526

jackssmirkingrevenge: I saw that project a while ago but neglected to follow the address to find out what the fps and that it is battery powered. The whole idea seems much more feasible now. But I have to finish some of my other projects first.

newbmatic:
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