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Code: 1234 This book is compiled according to the latest revision of National Professional Standard for Grinders (2009 Edition) by People's Republic of China (PRC), and it is a teaching material for vocational and technical qualification training and self-study of primary grinders. This book is divided into 19 chapters, which comprehensively introduces grinder professional ethics, basic knowledge of mechanical drawing, basic knowledge of metal technology, knowledge of tolerance fit and technical measurement, basic knowledge of machining, basic knowledge of grinding, basic knowledge of numerical control machining, basic knowledge of hydraulic transmission, basic knowledge of fitter, basic knowledge of electrician, external grinding, internal grinding, plane grinding, tool grinding and forming surface grinding, thread grinding and gear grinding. This book can be used as a reference for workers engaged in the teaching, research, use and maintenance of grinding technology.