Which command activates the coolant in CNC operations?

The command that activates the coolant in CNC operations is M8. In CNC programming, different commands or codes are designated for specific functions. The M-code set includes various commands that control auxiliary functions of the machine, such as activating and deactivating coolant.

When M8 is issued, it signals the machine to turn on the coolant, which is critical for the machining process. Coolant helps in two significant ways: it reduces the temperature generated by the cutting process, preventing damage to the tool and the workpiece, and it improves the surface finish by clearing chips away from the cutting area.

Understanding the context of other codes can clarify why M8 is the correct choice. For example, M5 is associated with stopping the spindle, while G41 is used for tool compensation to the left of the programmed path. G54 refers to a work coordinate system; it does not pertain to coolant activation. Overall, M8 is specifically designated for coolant operation, which is essential for effective CNC machining processes.