Pc-based Open Cnc System

Today, Computer Numerical Control (CNC) machines are found almost everywhere, from small job shops in rural communities to Fortune 500 companies in large urban areas. The productivity of manufacturing has been greatly upgraded as the result of the employment of the CNC technology. The possession and annual output of CNC machine indicate the manufacturing ability of the country. The improvement of CNC machine benefits from the development of CNC system.All of the conventional CNC systems are interface closed. It is difficult to change them or to add new function for users. Open-CNC systems can solve this problem. And the structure of the open-CNC system with its platform on the base of the Personal Computer (PC) is an important trend of the present CNC technology.We introduce in detail the structure and platform of the open-CNC system in this thesis. The present state of open-CNC systems is analyzed. The hardware structure is discussed. We choose the CNC enclosed PC structure. The motion control card based on PCI bus is designed. The module of software is divided. The function of each module is designed and the driver program is discussed. These provide reference frame and realization base for further research.