Offset apparatus for NC machine tool

An NC machine tool offset apparatus which is provided for an NC machine tool equipped with a numerical controller for controlling operation of a motion mechanism in accordance with an operation command signal, and which offsets the amount of operation of said motion mechanism which is driven and controlled in accordance with said operation command signal, comprising:

• analysis data storing means for storing three dimensional model data of said motion mechanism and condition data for performance analysis;
• analyzing means for analyzing the performance of said motion mechanism, based on said operation command signal in said numerical controller and on the three dimensional model data of said motion mechanism and the condition data for performance analysis stored in said analysis data storing means;
• data accumulating means for storing performance analysis data analyzed by said analyzing means;
• offset amount computing means for computing, from the performance analysis data stored in said data accumulating means, the amount of offset to be applied to a commanded operation amount directed by said operation command signal;
• and
• offset executing means for offsetting the amount of operation of said motion mechanism, based on the amount of offset computed by said offset amount computing means.