Cam grinding machines unlike most cylindrical grinders always use a master that automaticly controlls the grinding wheel to duplicate the profile of the master. These masters are produced from blanks and are ground to the profile of a new or unworn cam lobe. The cam grinder keeps a series of masters in a library that allow selected profile grinding of worn camshafts. These masters can be factory purchased as computer ground finished masters or simply ground on the cam grinding machine using a new or good cam lobe and duplicating the profile onto the blank. These new masters are then cataloged for future grinding requirements.