Because of their flexibility, CNC machining centers are preferred over drills and mills and are more efficient. a key advantage that CNC centering machine manufacturers gain from CNC machining centers is the ability to combine several different operations into a single setup. For example drilling, boring, drilling, tapping and contour milling can be combined into a separate CNC program. The milling cutter has its own motor that rotates when the spindle is stationary. More complex designs include eccentric milling, dual spindles, dual turrets, part transfer and other efficiency enhancing features. The basic approach to a machining center is a machine with 2 axes, a vertical X-axis and a level Z-axis. The key difference between a lathe and a milling machine is that the part rotates around the machine axis. In addition, the cutting tools are generally fixed and mounted in a rolling turret. The cutting tool follows the contours of the programmed tool path. Many contemporary machining centers are not just turning centers; non-standard fastener manufacturers base their milling tools on simple milling accessories, known as power tools, where the milling tool has its own motor and rotates while the spindle is stationary. More elaborate designs contain eccentric milling, dual spindles, dual turrets, part transfer and many other efficiency enhancing roles.
