The present invention relates to a simple setting method of a coordinate system of a CNC milling workpiece, and more specifically, when setting a workpiece to process a workpiece in a CNC milling machine for precision mold core production, so that the workpiece is accurately clamped to a preset position. It is related to a simple setting method of a coordinate system of a CNC milling machined workpiece, which enables automatic accurate measurement of the coordinates of a workpiece to be provided to and set on a CNC milling machine without repetitive manual setting operations consisting of position measurement/checking/positioning.
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