Centering bore and valve grinding machines are machines used for machining valves in automotive engines and other engines. The centering hole machine is used to accurately align the holes for the valve seats. This machine is capable of holding the valve seats in an exact position to ensure precise machining. The valve grinding machine is used to grind the valve seats to the desired shape and size. This machine uses a grinding wheel to remove the valve material until the desired shape and size is achieved. Both machines are important in maintaining the performance and efficiency of automotive and other engines. They ensure that valves fit properly and provide efficient and consistent air and fuel delivery. Translated with www.DeepL.com/Translator (free version)