Our STEM club’s mechanical puppet project was filled with interesting challenges. I addressed one in a previous blog: building a working jaw using a lever structure. In this article I will discuss the lessons learned while building movable eyes. The design challenge for the Movable 
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Recently, our STEM club did a four session electricity unit. We challenged the kids to design and build a battery powered toy that either moved or had lights and sound. Without exception, each team chose to build a toy that used a motor for movement. 
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While planning the puppet unit, the Kool Katz dreamers determined that teams would need a mechanism to hold the puppet upright while under construction. For this purpose, Dave developed a versatile piece of equipment we named the Gizmo Rig. The rig has been modified several 
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