In CNC programming, what is G-code primarily used for?

G-code is primarily utilized to define the machine's movements in CNC programming. This coding language instructs the CNC machine on how to operate, detailing the precise paths it should follow for tool movement, including positioning, speed, and feed rates. Each line of G-code corresponds to specific actions that must be performed, such as moving the tool to a certain coordinate, starting or stopping the spindle, or performing a specific cutting operation.

The other options refer to different aspects of machining and CNC operations. Setting the material type and properties is important for choosing the right tools and parameters but is typically not done with G-code. Diagnosing machine errors is a process involving error codes and alarms rather than a direct function of G-code. Lastly, managing machine tool life relates to maintenance and tracking the usage of cutting tools, which are separate from the operational commands provided by G-code. Understanding the purpose of G-code helps machinists and programmers effectively utilize CNC machines for precision operations.