Knex Pull-back Car, Ball Machine Element
by mathsboy314 in Living > LEGO & K'NEX
1002 Views, 2 Favorites, 0 Comments
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.