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Here's one of my knex ball machine elements I designed a while ago, which I used again in http://youtu.be/wKzJOZih_K8. It swings the ball about 200 degrees then sends it rolling like a 10 pin bowling motion.

Personally, I prefer the 'metallic' colours for this element, but for the sake of instructions I'll use classic pieces.

Step 1: The Inner Cube

The element has a centre pivot point that goes through this.

Step 2: Top Supports

The ball goes in this.

Step 3: Pivot Supports

This is where the rod goes through for the rotation.

Step 4: Counterweights and You're Done!

Once you add the counterweights you're complete. The ball should always fall one way (see step 1 picture 3) and roll the opposite direction.

It's great! I made it (and modified it) in my first ball machine and first Instructable! please check it out!
<p>Looks good!</p>
<p>Wow! This looks really cool and helpful in ball machines. Well done!</p>

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Bio: I'm into knex ball machine stuff. My favourite parts are lift/element hybrids, probably because I tried building a perpetual ball machine. It didn ... More »
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