US Patent 7548795 Numerical control system

A numerical control system using converted data is provided in which changes can be made quickly to the feed rate by speed override and the like, the operation of the machine according to the content of variable data, and workpiece offset data during machining operation. The numerical control system includes a machining-program/internal-processing conversion module for allocating during conversion a command in a machining program to an application program for the numerical control apparatus, a variable/offset conversion module for storing during conversion, with respect to a command such as a variable command and a tool offset command in the machining program, only referencing information for the command, and a conversion data executing module for directly executing, during machining program execution, the internal processing sequentially based on data allocated by the conversion module.