Gear part machining method, non-transitory computer-readable recording medium, and machining apparatus

A non-transitory computer-readable recording medium having program code stored thereon which, when executed by a computer, causes the computer to perform a gear part machining method comprising:

• measuring a toothed part to obtain a measurement value while holding one end portion of a cylindrical workpiece via a workpiece spindle such that a center axis of the toothed part extends along a rotation machining axis around which the workpiece spindle is configured to rotate, the toothed part being formed around the center axis of the toothed part on a circumferential surface of a cylindrical workpiece by performing tooth forming;
• calculating a misalignment between the center axis of the toothed part and the rotation machining axis based on the measurement value;
• and
• machining another end portion of the cylindrical workpiece opposite to the one end portion along the center axis eccentrically relative to the rotation machining axis based on the misalignment.

A machining apparatus comprising:

• a first workpiece spindle configured to hold a cylindrical workpiece to rotate the cylindrical workpiece;
• a tool holder configured to hold a measurement instrument and a tool;
• a mover configured to relatively move the first workpiece spindle and the tool holder;
• and
• a controller configured to control the first workpiece spindle, the tool holder, and the mover so as to
• hold one end portion of the cylindrical workpiece via the first workpiece spindle such that a center axis of a toothed part extends along a rotation machining axis around which the first workpiece spindle is configured to rotate, the toothed part being formed around the center axis of the toothed part on a circumferential surface of the cylindrical workpiece by performing tooth forming;
• measure the toothed part to obtain a measurement value via the measurement instrument that is held by the tool holder;
• calculate a misalignment between the center axis of the toothed part and the rotation machining axis based on the measurement value;
• and
• machine another end portion of the cylindrical workpiece opposite to the one end portion along the center axis eccentrically relative to the rotation machining axis based on the misalignment.