This document explains how to use G41 and G42 in CNC turning and the advantages of using these codes to achieve accurate cuts and precise dimensions for machined parts. The document starts with a brief introduction to the importance of tool radius compensation in CNC turning, followed by an overview of G41 and G42 and their functions. The document then explains how to use G41 and G42, provides examples of the codes in action, and outlines the advantages of using these codes in CNC turning. The document concludes by emphasizing the importance of understanding how to use G41 and G42 to increase the productivity of CNC turning machines and reduce the need for manual adjustments.