Hi! Here are the instructions to the multiple arm lift.

Here's a video: http://www.youtube.com/watch?v=0IF4ZdzzzVs

I designed this lift a long time ago and since then I have learned there are better methods of designing lifts. If you're considering building this then I suggest that you build one of these instead:

Step 1: Dispenser Frame

This is the frame that holds the entrance

Step 2: Ball Dispenser

This piece will be able to rotate when the arm comes down.

Step 3: Attaching the Dispenser

The dispenser gets attached to the frame.

The longer side of the dispenser goes inside the frame and will hold the ball.

The shorter side of the dispenser sticks out and will get hit by the arm.

Step 4: Entrance Track Frame

This section will hold the path coming into the dispenser.

Step 5: Entrance Track

This is a path that the ball will roll down to get to the dispenser. This path stays in place, and you can extend it as far as you want.

Step 6: 4 Red Rods

These rods hold the dispenser the correct distance from the rest of the lift.

Step 7: Main Frame - Layer 0

This box will sit underneath the main part of the lift.

One of the edges is a little strange. Its purpose is to prevent the bottom arm from turning too far.

Step 8: Attaching Layer 0

This fits in to the four red rods.

Step 9: Frame - Layer 1

This is the frame that goes around the bottom arm.

There is a gap where you'd expect to put a blue rod. We'll add that later.

Step 10: Attaching Layer 1

Add Layer 1 above Layer 0.

Step 11: Frame - Layer 2

This is the second layer of the frame. It will hold the motor and the crankshaft.

Step 12: Attaching Layer 2

Add Layer 2 above Layer 1.

There are pieces that are sticking out the side of the frame. Both of those pieces should be one the same side of the frame.

Step 13: Frame - Layer 3

This part of the frame will hold the upper arm.

Step 14: Attaching Layer 3

Add Layer 3 above Layer 2.

There are pieces that are sticking out the side of the frame. Both of those pieces should be one the same side of the frame.

Step 15: The Motor

This is a structure that will hold a tethered battery motor.

If you're using a different kind of motor then you can remove the red connectors and the rods they're attached to.

Step 16: Attaching the Motor

This motor attaches to pieces that are on the side of the frame.

Step 17: Motor Axle

This axle fits through the motor and has lots of spacers on it.

If you're not using the same kind of motor as the one in the instructions then you'll need a different number of spacers.

Step 18: The Crankshaft

This is a doulbe crankshaft. It will fit in the middle of the lift.

Step 19: Attaching the Crankshaft

The orange connector from the crankshaft attaches to the motor's axle.

Step 20: The Lower Arm

Here's the lower arm, there is a large hub as a counterweight.

Step 21: Adding the Lower Arm

This arm gets attached to Layer 1 of the frame. It also clips in to the crankshaft.

Step 22: The Upper Arm

Step 23: Attaching the Upper Arm

This arm gets attached to Layer 3 of the frame. It also clips in to the crankshaft.

Step 24: The Other Side of the Frame

This section supports the side opposite the motor.

Step 25: Attaching the Other Side of the Frame

Put this on the side opposite the motor. The orange connector should clip into the crankshaft

Step 26: Layer

Here is an example of a track you can build to take the ball at the top.

Step 27: Finished

Once you've added the exit track you should be finished.

Happy Building!

Introduction: Knex Multiple Arm Ball Machine Lift