What is G-code in CNC machining?

G-code is a programming language that is essential for instructing CNC (Computer Numerical Control) machines on how to perform various machining operations and movements. This language consists of a series of commands that tell the machine how to move its axes, what speeds to use, and how to control the tool during the machining process. Each command, known as a G-code, specifies a different function, such as linear movements, circular movements, or tool changes.

Understanding G-code is crucial for anyone operating CNC machines, as it allows for precise control of the machining process, enabling manufacturers to produce high-quality parts consistently and efficiently. The other options do not accurately represent what G-code is: it is not a type of tool, a standard for measuring precision, or an abbreviation for gear code. Therefore, recognizing G-code as a language for instructing CNC machines on their movements and operations highlights its fundamental role in modern manufacturing.