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Contents

Foreword xvii

About This Book xxiii

Masterpiece 1 Stair-Climber 1
Bill of Materials 2
Introduction 2
Building the Stair Climber 5
Engineering Trade-Offs 6
The Wheel Set 6
Building an Alternate Wheel Set 10
The Mid-Frame 15
The Outer-Frame 18
Putting It All Together 20
Operating the Stair-Climber 35
Using an RCX instead of a Battery Pack 35
Summary 37

Masterpiece 2 The Learning Brick Sorter 39
Bill of Materials 40
Introduction 41
Machines that Learn 41
Building the Learning Brick Sorter 43
The Body 43
The Pickup Stand 51
The Arm 57
The Valve 62
The Bins 65
The Switchbox 67
Putting It All Together 70
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