| Computer Numerical Control(CNC) is the basis of advanced manufacture technology, it is attached great importance widely at home and aboard and develops fastly. Past CNC system is tailor-made, which lacks of flexibility. Currently, Personal Computer(PC) grows very fastly which has many characteristics such as powerful function, widely using and opening system structure, so new generation CNC system based on PC is the development trend of NC system.In this paper, firstly, position measurement tache in CNC system is treated, and the methods of raising space resolution of measurement component is discussed. On the basis of the above, we put forward a new grating signal subdivision method by means of software based on PC and design the corresponding hardware interface circuit. Secondly, servo control tache is introduced briefly, and how to realize a closed-loop position control system which uses stepping motor as driver component is presented. In addition, interpolation arithmetic in CNC system is discussed detailedly and a new idea and realizing method is advanced.We discuss the real-time control problem in Windows 95/98/2000/NT operation systems in detail on the basis of analyzing the system structure of these platforms. And concrete realizing methods of how to manage bottom hardware by device driver in Windows 95/98/2000/NT are given, which resolves the timing interpolation and gathering data in Win32 environment in CNC system.In a word, we advance a bran-new project to resolve the two critical problems in establishing high precision CNC system based on Personal Computer and bring it into effect. |
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