g41g42 How to use,g41 is the tool radius left compensation, along the direction of the knife path, the knife to the left compensation, this is generally milling! g42 is the tool radius right compensation, along the direction of the knife path, the knife to the right compensation, this is generally the inverse milling! g40 is to cancel tool radius compensation. g41g42 can only be compensated behind the straight line (g0g1), and behind the arc (g2g3), it can not be compensated, and it will appear overcut