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A way to make a real k'nex fully automatic gun

UPDATE: I have begun to construct a gun out of this. It doesn't shoot very far in the video because I am using a motor to power it, but once I complete it I'm hoping that it'll be pretty powerful.

Video: http://www.youtube.com/watch?v=LJbFasz1eAg

Original Post: It occurs to me that you could use a crankshaft with a motor or wound up rubber-band to push and then subsequently pull a firing pin in your gun. This coupled with a hopper that can push rounds into the chamber, and you would have a truly fully automatic gun, as opposed to a ton of single-shots all on a chain (which is cumbersome to load).

I'm not good at all at actually designing k'nex guns (not anymore anyway), but I did put together and example of a crankshaft, and have attached photos and videos to this topic. The actual crankshaft at the back of the example could easily be elongated so that you could have your firing pin travel farther, and if you put that axle on a small gear attached to a larger gear which is on another axle with a rubber-band or motor to turn it, you could get at least 20 shots from the gun. Reloading it would also be really easy, as you could have a crank to turn the main axle allowing the rubber-band to build up potential energy once again.

Sorry if this is confusing, I'm not the best orator or typer as it were, but I think the pictures will be a lot easier to understand.

Sincerely,
Black Leopard

Video: http://www.youtube.com/watch?v=Gbmm3BaAQgc

Picture of A way to make a real k'nex fully automatic gun
Crankshaft Example: Right
Crankshaft Example: Bottom
Crankshaft Example: Left
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mmzdaniel9 years ago
that was my idea for the m4 carbine just moded to be more powerful, but you posted it first so its your idea.... by the way i got the idea from a car engine's piston, how did you get the idea?
forgot to say, the thing with the gears is called a gear ratio...
if you wanna learn more about it, go here:
http://science.howstuffworks.com/gear-ratio.htm
i made one of these ages ago!
but it isnt really full auto because you have to let go of the handle, i used a hook so when it reached a certain point the firing pin slipped off
blckleprd (author) 9 years ago
UPDATE: I have begun to construct a gun out of this. It doesn't shoot very far in the video because I am using a motor to power it, but once I complete it I'm hoping that it'll be pretty powerful.

Video: http://www.youtube.com/watch?v=LJbFasz1eAg
wait does this have to have a rubber band cause in the new video it doesnt looks like it has a rubber band
blckleprd (author)  Easy Button9 years ago
The model in this video does not use a rubber band, but a motor. The final gun may use a motor with more transitions between gears to make it faster, or rubber bands, depending on which makes the gun shoot farther.
smidge1479 years ago
will never work lol or u could use an extremely fast motor to push the bullets out.
blckleprd (author)  smidge1479 years ago
But you wouldn't use a motor. Instead you would use a rubber band wrapped around the axle with the big gear on top of it. Alternatively, you could keep ramping up the speed and lowering the torque (which you don't need a lot of for a k'nex gun) to make the motor produce something really fast. You'd only need to add one or two more axles to my current design to make it about 8x faster than the motor.
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