MEASUREMENT CORRECTING METHOD FOR MACHINE TOOL

PROBLEM TO BE SOLVED: To improve the working accuracy of a work to be worked by a numerical control machine tool by eliminating a fitting error of a tool in relation to a work table, an error due to the thermal deformation of the machine tool, and a tool dimension error. SOLUTION: A position A as a reference position is set along a control axis for relatively moving a spindle and a work table and a contact of a contact type detecting unit is brought in contact with a position C as a reference of a work on the work table so as to obtain the position C seen from the position A or from a position B at the same position with the position A or near the position A, and a first error as a fitting error of a work is obtained. A second error as a tool dimension error when a tip of a tool installed in the spindle is positioned at the position A and a non-contact type detecting unit is turned on is obtained. When working the work, relative feeding quantity along the control axis of the spindle and the work table is corrected on the basis of the first error and the second error.