What role does G-code play in CNC machining?

G-code plays a crucial role in CNC machining as it is the programming language that instructs the machine on how to move and operate. Essentially, it is a set of commands that dictate the specific paths and motions that the CNC machine must follow to create the desired part. This includes details such as the direction of movement, speed, feed rate, and tool selection.

When a CNC machine receives G-code, it interprets those commands to execute precise and complex machining operations, allowing for high levels of accuracy and repeatability. Each line of G-code corresponds to a specific action, such as moving the tool in a straight line or arc, or pausing before moving again. Without this coding, the CNC machine would not be able to function autonomously, as it would lack the necessary input to determine how to proceed with machining tasks.

The other options do not accurately convey the function of G-code; for instance, while tool programming and material specifications are important in CNC machining, these elements are addressed in other parts of the setup process rather than through G-code commands directly. Similarly, measuring dimensions is a part of quality control and setup, not a function of G-code itself.