4 Wheel Steering - Knex Car

This is Officaly my first Instructable so please if you have any advice on how to make my projects better or if I haven't explained something well enough please feel free to criticise or ask.

I was going thruogh the site and I saw all the different things that users have made out of knex. Guns, Cannons, grenades, stands, ext. One area that I thought was laking was the knex cars, the ones that had motors couldn't steer and the ones that could steer didn't have motors.

I hope that this Instructable will help bridge that gap... Then again it would be cool if sombody could mount a gun on this thing... :)

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Step 1: Drive Wheel

Yes you read that correctly. This car has four wheels that steer the thing and one that actually moves the thing...

I did spend a good amount of time on this and if that little thing bugs you then either change it on yours or just stop reading.

Step 2: Body

or as I call it the waffle because over the build period I kept on making this section thinner and thinner...

Step 3: Steering Wheels and Axels

This is where the wheel that make the car turn are made. Just to be clear, you do need two of these...

Step 4: Mounting the Drive Wheel and Motor

Finally the last thing to do is to add the drive system. I did work on this for a wile and I found that having more than one drive wheel creates excessive amounts of friction because having more that one or having the one not be in the center messes up the natural arch created when the wheels move to turn the car. I hope that explains it...

Step 5: Have Fun!

Go on, drive the thing around for a bit, add a gun to the top of the thing so you can drive it around a corner and shoot some thing the drive back to base, or just mod the heck out of it, the point of this site is to share ideas. So if this gives you a great idea for a butler-bot or a tank, go for it, just remember to mention your inspiration.

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    34 Discussions

    SonicX 22

    9 years ago on Introduction

     this is very cool!!!!!, im gonna make it then mod it to be a robot



    Reply 10 years ago on Introduction

    The gear system turns the two axles in opposite directions, that makes the wheels into an arch shape, then the whole thing moves on that arch. The picks in step 3 show it pretty well.

    you'd need to supersize the car, or use a small fleet to move that thing. or, you can build a special car with a gear system that can pull a gear from itself to stop the thing, or to change the direction.

    but the full size thing on controlled wheels would not only be convienient, but also terrifying. which is awesome.


    Reply 11 years ago on Introduction

    ROFL LOL LMAO !!!! "Just stick my cannon on top" ahahahaah! Hmm you could just stick Wicky's crossbow on a bigger version of this maybe even two heehe and maybe add one of I_am_Canadian's cannons ;D!


    Reply 11 years ago on Introduction

    Maybe a couple killerk's to start it off... and maybe a rocket launcher ... and a couple of laser cannons.... that new ninja baby weapon! And maybe some garden gnomes... ;D! and to top it off with stealth feature... a box!

    I actually took the thing apart... needed the snap connecters for my quad bow and I lack any video software at all...