SA 3252 V.7

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Introduction: SA 3252 V.7

About: I paint, write music, and used to build knex guns. I have a Bachelor's Degree in Studio Art. - updated 5/7/2014

I'm still working on this, but here's the latest.

How this version will work;

This gun is powered by a large elastic that is hand cranked around a spool. The different mechanisms are linked to each other by gears. The blocking mech section of the trigger mech moves at half the rate of speed that the spool and firing mech move. This is because the blocking mech blocks every 180 degree rotation, while the firing mech needs to operate on 360 degree rotations. The gun uses an "alternating" semi-automatic trigger mechanism that unblocks one block mech, while the other remains in a blocked position. This ensures that no matter how slowly you pull the trigger and no matter how fast the firing elastic rotates the mechanism, the trigger will not fail to block the mechanism in exactly one rotation.

I'm still working on this version, but I got good results in previous versions. Upon completion, this will likely fire 6 rounds from a magazine 30 feet semi-automatically before re-cocking. I intend to take this design to the end, not stopping my work on it until it can function no better.

UPDATE: I've begun working on version 8. Turns out 7 had some problems. 8 will still include gears, an alternating trigger mech, and the same firing mech, but I'm totally redesigning the rest of it.

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    83 Comments

    I smell it....a new era of K'nex mechs....and we're peeking around the corner of it..

    1 reply

    Great, if this takes off I can see a step forward in the K'nex community.

    1 reply

    Yes, thank you, that's exactly the purpose of this gun. It's about the potential of the design. There are so many applications of this and ways to improve it.

    I think he means you just cock it once after loading, then pull the trigger and it shoots like a semi auto. No cocking needed after the first one.

    Right, you wind it up six rotations, then it shoots 6 rounds without rewinding. The process is repeated after every six shots.

    That's not semi-auto then. That's like pumping a shotgun 6 times then firing off 6 shots. You still had to pump once for each shot fired, but just not right after firing.

    D: there's always so much contravercy on semi-autos that I wouldn't be surprised if someone set a whole site up for discussion about it.

    It fires 6 rounds in a row, one with each trigger pull. That is semi-automatic fire. Do not insult me.

    Well if you don't want to be "insulted" make a true semi auto. A true semi auto requires no prep for firing the gun aside from loading ammo. This gun requires winding.

    How about you make one?

    No one has ever invented a true semi automatic, at least not one that fires k'nex pieces or rods.
    Like a real semi-automatic rifle works with electricity or is gas operated.
    How do you expect that someone wil make that out of k'nex.
    at least Oblivitus is trying.

    Oodalumps made the wasp a true semi auto

    I tried, i used a hammer method and each trigger pull brings back the hammer to fire knew peice out of a turret. its on my page.

    Actually, (not directed at oblivitus) there are many semi autos out there. Louis XIV was one.

    http://knexinnovation.net/showthread.php?1108-WASP-War-Assault-Semi-automatic-Pistol Relax.

    I consider that as less of a semi auto, at least in the respect that it doesn't have a power supply. Although it's more of one in the sense that it doesn't require cocking.

    Actually, all semi auto guns need cocking for the first shot, after that the gasses released from the bullets detonation reloads it.