This issue of the library contains basic information on the internal grinding process in relation to the conditions of mass and partly large-scale production. It examines the equipment used, the most common in machine-building plants; issues of modernization of outdated equipment, grinding technology of the most characteristic parts of mechanical engineering, selection of cutting modes, characteristics of grinding wheels and methods of their straightening, mechanization and automation of the process; basic data on used lubricating-cooling liquids and methods of their filtration are given. The brochure is designed for grinding workers and craftsmen. It will also be useful for engineering technologists and toolmakers.