Repair and maintenance of grinding machines, grinding machines for the treatment of ceramics and metal, grinding machines for medical device equipment designed for medical device precision grinding and gauging, glass material production grinding, metal working, ceramic material forming and finishing, rubber material precision forming and finishing, wood precision form grinding, plastic materials precision grinding and finishing machines, grinding machines with spiral bevel gears, grinding tools for grinding machines, polishing machines for use in grinding and polishing metal, wood, ceramics, and plastics, power-operated grinding wheels, and wood grinding machines, and provision of related replacement parts