An automatic production system includes an automatic washing device usable to wash off swarf left on a workpiece by an NC machine tool. The automatic washing device is used before measuring a portion of a workpiece using a three dimensional measuring device controlled by a measuring part program controlling the three dimensional measuring device. When automating an operation of the washing device, a washing program is produced based on the a measuring part program controlling the three dimensional measuring device to be able to efficiently wash a minimal area of the work piece encompassing the portion of the workpiece to be measured.