Knex Concepts Update 9

Introduction: Knex Concepts Update 9

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

1: Slingshot Shotgun: A slingshot that fires several rods from a box. To load the gun, you cock it by pulling back the box with handles (one for each hand), then drop several rods into the box and pull the trigger to fire. The box has guides sticking out of it that go into slits in the gun. The bottom guide is stopped by the trigger when cocked. -by Oblivitus
2: Auto-Fire Pump Action: A pump action with a string attaching the pump to the trigger. When the pump is pushed all the way forward, the trigger is pulled and thus the gun fires itself. This allows for a higher rate of fire because it eliminates human reaction time and instead fires instantaneously. -by Oblivitus
3: MG 554: Could be a machine gun or a shotgun depending on how you build it and how fast that makes it fire (probably would be a shotgun). To cock it, a long, internal rectangular pin is pulled back. When the trigger is pulled, it rotates a gear, and a gear is rotated in the opposite direction by the first, which then rotates a tire (which has treads for friction) on a different layer, but is attached to the same rotation point as the second gear mentioned. The tire will rotate at the same rate of speed as the movement of the rectangular pin. This rotation will fire gray connectors from a magazine by pushing them out at high speeds. Gear ratios should be used to achieve maximum rotation speed while still maintaining sufficient torque (because the speed of rotation determines the range of the projectiles). -by Oblivitus

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    34 Comments

    0
    Knex.X
    Knex.X

    9 years ago on Introduction

    For the pump action gun: It's easier to make a gun without a trigger

    0
    ~KnexBuild~
    ~KnexBuild~

    9 years ago on Introduction

    The Auto-Fire Pump Action is a good idea. If there was some way that you could switch between the automatic firing mode and the normal way of just pulling the trigger normally, then that would be cool.

    0
    Oblivitus
    Oblivitus

    Reply 9 years ago on Introduction

    Thanks. And yes, that would be quite easy, actually. You'd just have to make a switch that would stop the pump from moving forward a few centimeters short of pulling the trigger.

    0
    ~KnexBuild~
    ~KnexBuild~

    Reply 9 years ago on Introduction

    Yes, that's what I was thinking of. It would decrease the power by a small amount, because then there would be a slightly smaller pin draw, but it wouldn't make much difference. The K'nexsayer would probably be a good gun to modify to use the auto fire pump action.

    0
    Oblivitus
    Oblivitus

    Reply 9 years ago on Introduction

    It wouldn't make any difference to the power. Yes, that's would be a good use for it.

    0
    ~KnexBuild~
    ~KnexBuild~

    Reply 9 years ago on Introduction

    Do you think the K'nexsayer would be able to use the auto fire pump action with the switch that would change it back to normal firing mode? It seems like that it wouldn't be able to hit the white rod in the turret that pushes the bullet out, because there would be a slightly smaller pin pull because of the switch.

    0
    Oblivitus
    Oblivitus

    Reply 9 years ago on Introduction

    Hmm. Yeah that would pose a problem for a preexisting design like that. You might be able to figure something out though. If you could make the pump rail longer or reposition part of the firing system you could likely make it work.

    0
    wabawaba
    wabawaba

    10 years ago on Introduction

    just figured out a system that can help us get ranges of knex guns without actully building them.

    step 1: Use virtual knex to create a gun design

    step2: P= power of the rubber band( when you buy rubber bands it should say that this rubber band is rated for 1lb,or what every it says.

    D=distance= amount of the firing pin that makes it past the trigger and ends up in the barrel

    W=is the measured weight of a projectile, not counting oodammo

    R= range

    Equation= P times D divided by W= R

    Step 3= go outside and shoot a knex gun that u have created, it should be just a regular old stick and tube gun, and average the ranges, now we need a formula to convert th range= R to feet

    Step 4= establish a graph that will show ranges, and display on instructables

    0
    wabawaba
    wabawaba

    10 years ago on Introduction

    Hi guys Im new to the community, but heres a few cool ideas I thought of.

    the first picture is of a knex rifle mech box with a double stack magazine, also it is minimized because instead of the rubber bands I use a spring and a lever. So now you can actually have a minimized lever action rifle. More like the model 1887.

    The second picture is of a high capacity rubber band gun idea also very simple. All it does is use the second wheel as a rubber band holder. As the spin since they are connected the rubber bands go on the first wheel and fire. Also the pieces that are labeled "slowing Mechs" are there to slow down the rate of fire and should be held down with lots of rubber bands

    Picture 14.JPGPicture 13.JPG
    0
    Oblivitus
    Oblivitus

    Reply 10 years ago on Introduction

    They look good, but keep browsing around too, the second one has been done. Oh, and if you want, you can post a slideshow with your drawings, one of the advantages is that you can get bigger pictures than that.

    0
    wabawaba
    wabawaba

    Reply 10 years ago on Introduction

    i ghavent really seen it done before. Maybe you didnt understand it, I was talking about how the rubber bands feed from 2 wheels at a time, also check out my new oodamo gun.

    0
    prodo123
    prodo123

    10 years ago on Introduction

    I tried the slingshot shotgun once. Too weak, if not unreliable. It has too little speed and force, but a lot of momentum. Also requires rails for any kind of reliability. Pump action auto trigger? That would be annoying as heck, no offense.
    You have a thing for wheel designs, hm? I mean sure they're awesome, but in the end they'll be too inaccurate and weak.

    Good stuff. You should become an engineer or something. :D

    0
    Oblivitus
    Oblivitus

    Reply 10 years ago on Introduction

    The idea of the auto trigger is to step in the direction of a machine gun. Thanks for the comment.

    0
    prodo123
    prodo123

    Reply 10 years ago on Introduction

    Ah, like the AA12. That's a great idea!

    0
    mahmel
    mahmel

    10 years ago on Introduction

    but than the pump action shotgun have no trigger??

    0
    Oblivitus
    Oblivitus

    Reply 10 years ago on Introduction

    It has a trigger, but it's not pulled manually.

    0
    mahmel
    mahmel

    Reply 10 years ago on Introduction

    oh yeah haha thanks that's what I meant. :)
    Are you going to make some of your concepts by yourself, by the way?