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1.0 INTRODUCTION 2.0 BASIC GEOMETRY OF SPUR GEARS       2.1 Basic Spur Gear Geometry       2.2 The Law of Gearing       2.3 The Involute Curve       2.4  Pitch  Circles       2.5 Pitch             2.5.1 Circular Pitch             2.5.2 Diametral Pitch             2.5.3 Relation of Pitches 3.0 GEAR TOOTH FORMS AND STANDARDS       3.1 Preferred Pitches       3.2 Design Tables       3.3 AGMA Standards 4.0 INVOLUTOMETRY        4.1.1 Gear Nomenclature        4.1.2 Symbols        4.2 Pitch Diameter and Center Distance        4.3 Velocity Ratio        4.4 Pressure Angle        4.5 Tooth Thickness        4.6 Measurement Over-Pins        4.7 Contact Ratio        4.8 Undercutting        4.9 Enlarged Pinions        4.10 Backlash Calculation        4.11 Summary of Gear Mesh Fundamentals 5.0 HELICAL GEARS        5.1 Generation of the Helical Tooth        5.2 Fundamental of Helical Teeth        5.3 Helical Gear Relationships        5.4  Equivalent Spur Gear        5.5  Pressure Angle        5.6  Importance of Normal Plane Geometry        5.7 Helical Tooth Proportions        5.8 Parallel Shaft Helical Gear Meshes                5.8.1 Helix Angle                5.8.2 Pitch Diameter                5.8.3 Center Distance                5.8.4 Contact Ratio                5.8.5 Involute Interference        5.9 Crossed Helical Gear Meshes                5.9.1 Helix Angle and Hands                5.9.2 Pitch

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