MACHINING ERROR CORRECTION METHOD ADAPTED FOR NUMERICALLY CONTROLLED MACHINE TOOL AND GRINDING MACHINE USING THE SAME

A machining error correction method corrects error in machining of a work by a tool. The method is adapted for a machine tool that includes a numerical control unit in which a movement amount of the tool is programmed and a tool moving unit that is driven by an instruction signal sent from the numerical control unit and feeds the tool to the work fixed on a work table. The method includes the steps of moving the tool from a program origin to a measurement point provided separately from the program origin by giving a predetermined measurement movement amount to the tool moving unit from the numerical control unit; measuring a positional deviation amount between the measurement position and a tool position after the movement is finished; and correcting a machining movement amount of the tool moving unit using the positional deviation amount when the work is machined.