Multi-axis processing machine and method for measuring rotation center of multi-axis processing machine

A method for measuring a rotation center of a multi-axis processing machine,

• wherein the multi-axis processing machine has a rotation axis, and a processing head and a table are configured to be relatively rotatable, and
• wherein the method uses a reference ball and a measurement device which has a probe and measures, as a measurement value, a movement amount of the probe when the reference ball contacts the probe and comprises:
• a measurement process of rotating the rotation axis to measure the measurement value in a state in which the probe of the measurement device installed to one of the processing head and the table contacts the reference ball installed to another of the processing head and the table;
• a measurement point search process of, before the measurement process, monitoring the measurement value while changing relative positions between the reference ball and the probe in the state in which the probe contacts the reference ball, and setting a maximum value of the measurement value as the measurement value for calculating a rotation center of the rotation axis;
• and
• a rotation center calculation process of calculating the rotation center of the rotation axis from the measurement value, a rotation angle of the rotation axis, and a position of a center of the reference ball.