Patent ID: 8720025

Claim:
A method for controlling a combined lathe apparatus, wherein the combined lathe apparatus comprises: a workpiece spindle on which a workpiece is mounted, the workpiece spindle having a first axis; a tool spindle to which a turning process tool for carrying out a turning process on the workpiece is removably attached; an automatic tool replacing device to take out a specific turning process tool from among a plurality of turning process tools and to replace the turning process tool attached to the tool spindle with the specific turning process tool; a tool headstock which is movable along a second axis which is perpendicular to the first axis of the workpiece spindle and forms a predetermined angle with a horizontal plane, wherein the predetermined angle is greater than zero degrees and less than or equal to ninety degrees, wherein the tool spindle forms a portion of the tool headstock; and a movable body which supports the tool headstock; wherein the movable body is movable in a direction including a third axis component which is perpendicular to the first axis and the second axis; wherein the tool spindle is controlled to be rotated or held without being rotated; and wherein a cutting point of the specific turning process tool attached to the tool spindle is moved along a horizontal line which is perpendicular to the first axis by moving the movable body in the direction including the third axis component.