What do M codes control in a machining process?

M codes, or miscellaneous function codes, are essential in CNC (Computer Numerical Control) machining as they control various non-motion-related functions that are crucial for the machining process. These codes enable the machine to perform specific tasks that support the cutting operations but are not directly related to the movement of the tool itself.

For instance, M codes can command the machine to start or stop the spindle, initiate coolant flow, or change tool settings. This versatility makes M codes vital for ensuring that the machining operation runs smoothly and effectively, allowing operators to manage ancillary functions that support the primary cutting actions dictated by G codes (which control the tool movements).

In summary, M codes encompass a range of miscellaneous functions necessary for machining, making them integral to the overall process beyond merely controlling tool movements or focusing on safety or operational pauses.