Design and Implement of a Modularized NC Program Interpreter

In order to improve the universality and expansibility of the existing CNC (Computer numerical control) interpretation technique, a new model of NC program interpreter is proposed based on the format and characteristics of NC program. This model uses the modularized structure. Because of the independence of module function and the consistency of the interface, each module of the interpreter can be design and expansion independently without affecting other modules. Improve the grammatical rules by using EBNF (Extended Backus-Naur Form),which effectively eliminates the uncertainty of grammatical analysis caused by grammatical ambiguity. The error handling module introduced cannot only detect all kinds of interpretation error automatically, but also pointed out the wrong location directly. A modularized interpreter prototype system which verified the validity of the proposed method was developed. The experimental Results shows that the interpretation time is much less than the program machining time, so the modularized NC program interpreter proposed can improve the interpretation efficiency significantly.