The part program is a sequence of instructions, which describe the work, which has to be done on a part, in the form required by a computer under the control of a numerical control computer program. It is the task of preparing a program sheet from a drawing sheet. All data is fed into the Numerical Control system using a standardized format. Programming is where all the machining data are compiled and where the data are translated into a language which can be understood by the control system of the machine tool.
The machining data is as follows :
(a) Machining sequence classification of process, tool start up point, cutting depth, tool path, etc.
(b) Cutting conditions, spindle speed, feed rate, coolant, etc.
(c) Selection of cutting tools.
Part program is very useful for operate the machining operations. By part programing we can inspect the movement of work piece and the tool of CNC machine.
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