NIMS Computer Numerical Control (CNC) Machining Practice Exam

The correct code used for counterclockwise arc direction in CNC operations is indeed the G03 code. This standard G-code indicates that the machine should perform a circular interpolation in a counterclockwise direction, which is often required when creating arcs or circular shapes on machined parts. Understanding the other codes can further clarify why G03 is the appropriate choice. G02 is used for clockwise arc movements and facilitates the creation of circular shapes in the opposite direction. G01 denotes linear movement in a straight line, which does not apply to arc direction as it is not concerned with curvilinear paths. G00 is employed for rapid positioning without cutting, emphasizing speed rather than any specific directional control. Thus, G03 is specifically designed for scenarios where a counterclockwise arc is required, making it the most suitable option for the question posed.