Tool Post Grinder is a type of cylindrical grinder that is mounted on the tool pose of a lathe. It provides us with the ability to do precision grinding without all the cost of a separate cylindrical grinding machine. The downside of the grinding is a messy business and lathes are precision machines. Tool Post Grinder is used to hold cutting tools. As it allows for rapid tool changeover and provides a high degree of position repeatability and indexing.