What defines a "linear axis" in FANUC terminology?

In FANUC terminology, a "linear axis" is defined as one that allows straight-line movement in a single direction. This characteristic is fundamental to the operation of CNC machines, where such axes are typically responsible for the movement along the X, Y, or Z coordinates, enabling precise positioning and machining processes.

Linear axes are crucial for applications that require exact movements along a predetermined path, as they provide the ability to achieve accurate cuts, drills, or engravings without deviation from the intended linear trajectory. This contrasts with other types of axes, such as rotational axes, which facilitate circular or angular movement. Linear axes do not allow for circular motion as seen in rotary axes, nor are they restricted to limited directions since they enable full linear movement across their respective dimensions. This definition ensures clarity in understanding how various movements are achieved in automated systems and is essential for programming and operating CNC machines effectively.