Knex Pull-back Car, Ball Machine Element
by mathsboy314 in Living > LEGO & K'NEX
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Knex Pull-back Car, Ball Machine Element

This element is a lever and a car. The lever engages a motor which pulls the car to the top of a ramp. Then the ball gets on the car and drives back down the ramp.
This was used in my most recent ball machine: https://youtu.be/-u3Mi7ozmv0?t=25
Frame




Lever Axel







Combining Steps


Ball Arm




This is where the ball waits while the car is getting pulled back.
Lever Counterweight




Motor Axel




Engaging Gear




This gear will be attached to the lever. This is what engages the motor to the rest of the mechanism.
Further Frame



This holds the lever so it doesn't tilt too far backwards.
Disengaging Gears






When the lower gear has does 3/4 of a revolution, it will force the lever to tilt back. This will disengage the motor, release the ball, and let the car go down the ramp.
Even Further Frame



This stops the Disengaging Gears from rotating too far backwards.
Reel








This is what pulls the car up the ramp.
​Final Frame









This helps the ball land properly on the car.
The Car



Once you're done, tie this to the Reel, and build a track for the car to go on.