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5.9.3 Center Distance                    5.9.4 Velocity Ratio         5.10 Axial Thrust of Helical Gears       6.0 RACKS 7.0 INTERNAL GEARS         7.1 Development of the Internal Gear         7.2 Tooth Parts of Internal Gear         7.3 Tooth Thickness Measurement         7.4 Features of Internal Gears 8.0 WORM MESH         8.1 Worm Mesh Geometry         8.2 Worm Tooth Proportions         8.3 Number of Threads         8.4 Worm and Wormgear Calculations                   8.4.1 Pitch Diameters, Lead and Lead Angle                   8.4.2 Center Distance of Mesh         8.5 Velocity Ratio 9.0 BEVEL GEARING         9.1 Development and Geometry of Bevel Gears         9.2 Bevel Gear Tooth Proportions         9.3 Velocity Ratio         9.4 Forms of Bevel Teeth 10.0 GEAR TYPE EVALUATION 11.0 CRITERIA OF GEAR QUALITY         11.1 Basic Gear Formats         11.2 Tooth Thickness and Backlash          11.3 Position Error (or Transmission Error)           11.4 AGMA Quality Classes         11.5 Comparison With Previous AGMA and International Standards 12.0 CALCULATION OF GEAR PERFORMANCE CRITERIA         12.1 Backlash in a Single Mesh         12.2 Transmission Error         12.3 Integrated Position Error         12.4 Control of Backlash         12.5 Control of Transmission Error 13.0 GEAR STRENGTH AND DURABILITY         13.1 Bending Tooth Strength         13.2 Dynamic Strength         13.3 Surface Durability         13.4 AGMA Strength and Durability Ratings

T57 T57 T57      T58       T58 T59 T60 T61      T61 T62 T62 T62 T63 T63 T64      T64 T66 T66 T67 T68     T68 T70 T70 T73 T73     T76 T77 T77 T78 T78    T78 T82 T88 T88

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