text: Computer aided manufacture is described as the interfacin of a computer with a machine tool or process to achieve automated operation. The early form of computer controlled automation was knoon as numerical control (NC) and allowed the control of modified, but otherwise traditional machine tools for metalworking application. The later came the system of Commonly knon as Computer Numerical Control (CNC). With the help of these manufacturing industy has sought to expand production methods that could overcome many of the limitations of mechanised mass production and the inherent standardisation of the goods.