In this lecture we will learn how to write a part program to manufacture drilled holes. Let us take an exercise and study the various preparatory and miscellaneous functions associated with the problem.

Exercise:
Write an efficient CNC part program to drill 35 holes of diameter of 0.5 inch each in a machine component as shown in the figure 7.2.1. The raw material to be employed is mild steel plate of 0.4 inch thickness. Explain the important functions used in the CNC code. 

                           

Figure 7.2.1 A component to be machined (drilled)