What code specifies machine-level actions such as tool changes and spindle control in a part program?

What code specifies machine-level actions such as tool changes and spindle control in a part program?

• A. M code
• B. F code
• C. STEP
• D. Toolpaths in CAM

Answer: (A)

Machine-level actions like tool changes and spindle control are controlled by M codes in a CNC program. These codes tell the machine to perform non-movement tasks that accompany the cutting path. For example, a tool-change command triggers swapping tools, spindle-related codes start or stop rotation (and in which direction), and coolant commands turn on or off cooling as needed. This is what distinguishes them from other instructions: feed rate (F) sets how fast the tool moves but doesn’t execute a machine action, STEP is a data format for exchanging models, and CAM toolpaths describe the planned path but don’t themselves enact tool changes or spindle control. So, the code that specifies those machine-level actions is M code.

Machine-level actions like tool changes and spindle control are controlled by M codes in a CNC program. These codes tell the machine to perform non-movement tasks that accompany the cutting path. For example, a tool-change command triggers swapping tools, spindle-related codes start or stop rotation (and in which direction), and coolant commands turn on or off cooling as needed. This is what distinguishes them from other instructions: feed rate (F) sets how fast the tool moves but doesn’t execute a machine action, STEP is a data format for exchanging models, and CAM toolpaths describe the planned path but don’t themselves enact tool changes or spindle control. So, the code that specifies those machine-level actions is M code.