Researh on a new model of numerical control program interpreter

With the constant development of numerical control technology, the expansion of CNC (computer numerical control) system function is restricted with the interpreter lacking in universality and expansibility. In order to deal with this problem, a new model of interpreter was proposed based on the analysis of NC (numerical control) program basic format. The model is consisted of a NC program rules module and a processing module which includes a lexical analysis submodule, a syntax analysis sub-module and a machining command converting sub-module. The legal word table and the machining function definitions table in the NC program rules module assist the processing module to interpret the NC code. It is very pivotal for the interpreter to be expansible that the CNC system developers can easily modify the NC program rules module and other sub-modules in accordance to different functional requirements. The design process of every module was expatiated and an interpreter prototype was developed based on this mechanism, which verified the validity of this proposed approach.