Numerically controlling apparatus for the machine tool

An apparatus for controlling a machine tool, comprising:

• a tool path generating means for generating a tool path for forming a worklpiece on the basis of a numerical control program;
• a working region setting means for setting a desired working region to be displayed on a display unit, the desired working region corresponding to a portion of the workpiece that is less than an entirety of the workpiece;
• a tool path extracting means for determining a portion of the tool path that corresponds to the desired working region;
• a display means for displaying a representation of the workpiece, the desired working region relative to the representation of the workpiece, and the portion of the tool path relative to the desired working region;
• a grid space determining means for dividing the desired working region into grid-like portions that are displayed on the display means;
• a working region dividing means for dividing the portion of the tool path corresponding to the desired working region into a plurality of tool path segments, each of the plurality of tool path segments corresponding to a respective one of the grid-like portions;
• a tool path extracting means for extracting a tool path segment corresponding to each grid-like portion;
• a grid selecting means for selecting a grid-like portion displayed on the display means;
• and
• a tool path editing means for modifying the tool path segment that corresponds to the selected grid-like portion so as to make up a new numerical control program on the basis of the modified tool path segment.