What does the code M30 signify in CNC programming?

In CNC programming, the code M30 signifies the end of a program. This command typically indicates that the CNC machine should conclude the current program execution and return to the beginning, allowing for either a re-run of the program or preparation for a new task.

When M30 is encountered in the code, the machine will generally go through a series of steps: it will stop the spindle operation, bring the tool to a safe position, and reset the program counter to the start of the program. This facilitates efficient workflow in machining operations, as it allows the operator to quickly restart the program without needing to re-enter the beginning commands manually.

Unlike other commands, such as those for tool changes or system resets, M30 specifically focuses on the conclusion and return of program control, making it a critical component in managing CNC operations effectively.