ERROR IDENTIFICATION METHOD FOR MACHINE TOOL

The present invention relates to an error identification method for a five-axis controlled machine tool including three translational axes for translational control in X, Y, and Z axis directions and two rotation axes for rotation control about B and C axes. The method comprises a step of providing a reference sphere to the C axis and attaching a touch probe to the B axis; a first measurement step of measuring a center position of the reference sphere while indexing an angle of the B axis for each predetermined angle, with the C axis fixed; a second measurement step of measuring the center position of the reference sphere as in the first measurement step with a turning radius of a measurement point of the touch probe changed; a third measurement step of measuring the center position of the reference sphere while indexing an angle of the C axis for each predetermined angle, with the B axis fixed; and a fourth measurement step of measuring the center position of the reference sphere as in the third measurement step with a Z direction initial position of the reference sphere changed.