CNC Milling programming example code with drawing, which shows how G41 Cutter Radius Compensation Left is used in a cnc mill program.
CNC Mill Program (G41 Cutter Radius Compensation Left)
N10 T2 M3 S447 F80 N20 G0 X112 Y-2 N30 Z-5 N40 G41 N50 G1 X95 Y8 M8 N60 X32 N70 X5 Y15 N80 Y52 N90 G2 X15 Y62 I10 J0 N100 G1 X83 N110 G3 X95 Y50 I12 J0 N120 G1 Y-12 N130 G40 N140 G0 Z100 M9 N150 X150 Y150 N160 M30