Book excerpt: Precision CNC Machining for High-Performance Gears: Theory and Technology covers basic theories and methods, key technologies, and machining equipment in precision CNC machining of high-performance gears. Sections cover research status and development trends of machining technologies and CNC machining equipment of high-performance gears, calculation theories of the precision modification method of high-performance gears, methods of reducing the machining principle errors of high-performance gears, the modeling method of multi-source errors and the compensation technique of CNC gear machine tools, the key technologies of precision CNC gear machine tools, the optimization method of the process parameters of hobbing and grinding, key technologies, and more. - Covers a proposed new method to calculate the envelope of the point vector family in the machining process of modified gears - Details a new multi-source error modeling method and compensation technology of gear machine tools - Describes the development of high-performance gear precision machine tools and its components to break monopolies - Presents an optimization method of gear hobbing and grinding processes developed to guarantee machining accuracy and surface integrity