CDHA51 series inverted turning center is composed of an inverted spindle and the rotary turret equipped with power unit. Its machining range can be extended by adding Y axis. The spindle is driven by AC servo motor which can achieve the infinitely variable speeds and save the space for the structure of mechanical and electrical integration. It can be also equipped with feed mechanism and work piece flip device, which is especially suitable for the batch machining of disc and sleeve parts.