Knex Multiple Arm Ball Machine Lift

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:

• Right Handed Arm Lift
• Shifting Arm Lift
• Flimsy Connected Arm Lift

This is the frame that holds the entrance

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

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.

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.

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

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.

This fits in to the four red rods.

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.

Add Layer 1 above Layer 0.

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

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.

This part of the frame will hold the upper arm.

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.

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.

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

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.

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

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

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

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

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

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

Happy Building!