THIS REPORT WAS WRITTEN TO HELP MANUFACTURING ENGINEERS DEVELOP AN AWARENESS OF BASIC FACTORS WHICH MAKE THE TOOLING HEAD CONCEPT FUNCTIONAL. THESE FACTS ARE COMPATIBILITY BETWEEN TOOLING HEADS AND MACHINING CENTER, TYPE OF OPERATIONS PERFORMED, POWER AND THRUST REQUIREMENTS RELATIVE TO THE TYPE OF OPERATION, LOCATION ACCURACY OF HOLES DRILLED BY THE TOOLING HEADS, AND TOOLING HEAD CONSTRUCTION FEATURES.