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Let me welcome you to the 12th lecture of Drilling and Blasting Technology course. In this lecture we will discuss about the Drilling Pattern. But like every class let us retrospect the previous lecture. In last few classes we have read about the different types of drilling machines, their classification according to the drilling pattern and manner. They are drilling mechanism principle applicability and efficiency and various condition we are also discussed. We have also covered the accessories which are essential to a drilling machine like drill bit shank adapter coupling. In fact, modern drill machines are almost automated computer fitted, where it is very easy to control, every time machine is interactive with the rock condition. And the operators are very expert in operating these machines. If you look into this last 3 part that drill bit shank adapter and coupling, basically a drill machine may change it is diameter of drilling by only changing this 3 part. If they are changing