5-axis CNC machining is a precision milling process where the cutting tool or workpiece moves along three linear axes and two rotational axes. Compared with 3-axis machining, 5-axis machining allows the tool to approach the part from multiple directions, making it possible to machine complex surfaces, undercuts, angled holes, and features on several faces in fewer setups.
For complex precision parts, fewer setups can mean less datum transfer error, better positional accuracy, improved surface finish, and more consistent part-to-part repeatability. This is why 5-axis CNC machining is commonly used for robotic components, aerospace brackets, medical device parts, semiconductor fixtures, optical mounts, and complex housings.