Which command indicates a tool spindle rotation in a clockwise direction?

The command that indicates a tool spindle rotation in a clockwise direction is M03. In CNC programming, specific M codes are used to control different functions of the machine. M03 specifically initiates the spindle to rotate clockwise, which is essential for operations like drilling or milling, where the tool needs to cut into the material in a specific direction.

Understanding the role of spindle rotation is crucial in CNC machining, as it determines the cutting process's efficiency and effectiveness. Each spindle command serves a distinct purpose; for instance, M05 is used to stop the spindle, while M00 is a program stop command. M01 allows for an optional program stop but doesn’t relate to spindle movement. Therefore, M03 is the correct command for indicating clockwise spindle rotation, essential for accurately executing machining operations.