Hard turning Hard turning machine compared with non-hardened steel turning, cutting force increased by 30% to 100%, cutting the required power increased by 1.5 to 2 times, so the Hard Turning on the machine and set higher requirements, such as high stiffness, power and so on. In addition to the machine itself, the spindle system to ensure high rigidity outside, but also has a high speed, to ensure the full performance advantages cbn or ceramic tools. However, the high speed spindles, often prone to vibration, to prevent and eliminate vibration, including the entire spindle system includes jig must be well-balanced, spindle runout and face runout shall not be greater than 3μm. Precision Machine Tool is higher, better linearity, the gap should be small, especially not have creeping phenomenon. In addition, the machine must have good thermal stability, thermal deformation of the machine to be within a certain range, so as to ensure continuous production of precision machining.