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B.P.G. (Belt-fed Pin Gun)
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Imagine any chain-fed gun, then wrap the ammo around it front to back.
About this creation
The basic idea originally came when I was trying make a chain-fed gun and had problems with storage/feeding, which is when I decided to just wrap the whole chain around the gun itself.

The concept is really quite simple. Each time the touch sensor is pressed, the feeding motor turns one sixth a rotation to position a new tread link, then the firing motor turns half a rotation to fire one pin. Since it alternates firing left and right pins, there are an odd number of links so that all the ones it misses on the first pass are picked up on the second.

As you can imagine, the idea of "shooting" pins by just poking them from the back really isn't very effective... I was really just trying to see if I could make it feed and shoot properly with the belt wrapped from front to back like that.

It was purely accidental, but it ended up being pretty modular. The last picture shows the whole thing deconstructed into chunks.

I guess thats about it. Enjoy!


From the side



Without the belt



The feeding mechanism detached



Close up of the feeding mechanism gearing.



From the top without the feeding mechanism



The frame that holds the belt in place while the pegs are being shot as viewed from the top



The firing pins with the belt frame removed



The central portion with feeding mechanism and NXT removed



A better view of how the firing pins are actually moved



In pieces



Comments

 I made it 
  April 7, 2010
Quoting Farhan Salman Nice. Can it shoot?
yes, but it has very little range, I was just trying to see if I could get it to work at all, not really going for effectiveness.
 I like it 
  February 9, 2010
Nice. Can it shoot?
 
By Dex Hahne
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Added January 12, 2010
 You are at the beginning of this folder.  You are at the end of this folder.
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LEGO models my own creation MOCpages toys shop B.P.G. (Belt-fed Pin Gun)Robotics


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