METHOD FOR GENERATING NC PROGRAM

PURPOSE: To perform the working-shape processing shown by the calculating formula that an NC program generating device does not have by generating NC data by using the value of a variable for the arithmetic expression of an output pattern. CONSTITUTION: A working-shape calculation formula to be used in a selected working pattern (rotating body) and necessary information are inputted. For instance, the calculation formula showing the shape of a cam groove is inputted from a keyboard 11. The values of the variables of this calculation formula 7 are successively inputted. When the selection of the working pattern is terminated in this way, an NC(numerical control) program generating part 9 automatically generates the arithmetic expression for converting a radius and an angle into the coordinate values of an X-axis and Y-axis by an internal processing based on the calculating formula and necessary information. Therefore, the output pattern for NC data calculation is prepared. Next, by performing a calculation by the NC program generating part 9 by using the arithmetic expression of this output pattern in the range of the inputted variable, NC data is generated and the data is displayed on a screen.