FMDM155 Built-in asynchronous motor spindle with facing head is designed of a ball screw grade C5 driven which are incorporated with a servo motor for feeding. The roundness of spindle nose is within 0.002mm and repeatability of facing head slider is within 0.01mm and driven by a servo motor. This spindle unit is capable for processing like inner (ID) and outer (OD) turning, grooving, conical boring, conical threading, concave/convex rounding and other spherical machining.