Instructables

Knex Elevator Free Fall Lift

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Hello everybody.
     I got the inspiration for this lift after seeing Alocke's ball machine Tartarus. As you can guess by the name, when the car gets up to the top it suddenly free falls. This is do to the special gearing mechanism. I modified a medium knex gear by taking off some of the teeth leaving only 17 left.  When the teeth of the medium gear catch hold of the small gear (see picture 10) it turns the shaft which is connect to a wheel-like device which winds in the string (or chain) connect to the car thus pulling the car up. When the car gets up to the top there are no more teeth turning the blue gear thus making the car fall. Enjoy the video.


 
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Step 1: The Base

Picture of The Base
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Step 2: The Track part 1

Step 3: The Track part 2

Step 4: The Entrance

Step 6: The Bottom Side

Step 8: The Exit

Step 9: The Elevator

     For this step you can either use string, fishing line, or mini chain links as seen in the last three pictures. Make sure you cut the string (or fishing line) just long enough so that the elevator touches the ground. Sorry, I forgot to count how many mini chain links to use.

Step 10: The Back Support

Step 11: The Sides part 1

Step 12: The Sides part 2

Step 13: All Done!

Congrats! You've finished the elevator free fall lift. Make sure you flip the switch to the left or it won't work.