Error identification method for five-axis-control machine tool, non-transitory computer-readable storage medium, and five-axis-control machine tool

An error identification method for identifying an error of a five-axis-control machine tool that includes a spindle rotatable with a tool mounted thereon, a table configured to secure a workpiece and/or a jig, three linear axes orthogonal to one another and configured to relatively move the spindle with respect to the table, and two rotation axes configured to turn and/or incline the table, wherein

• the error identification method comprises:
• mounting a position measurement sensor tool on the spindle and securing a calibrator having three or more spheres on the table;
• measuring an initial position of the calibrator with the position measurement sensor tool;
• calculating a reference angle of each of the rotation axes for positioning the calibrator to a predetermined reference position using a measured value in the measuring of the initial position of the calibrator;
• indexing each of the rotation axes to a plurality of indexed angles with respect to the reference angle followed by measuring a center position of a sphere of the calibrator secured on the table at each of the indexed angles with the position measurement sensor tool;
• and
• identifying a positioning error and a straightness error of two of the linear axes, three squareness error between the respective linear axes, a scaling component of a positioning error of one of the linear axes other than the two of the linear axes, and a position error and an inclination error of each of the rotation axes based on a measured value in the measuring the center positions of the sphere of the calibrator.