| Gear measuring is very important in precise measurement. With the evolution of optics, mechanics,electronics and computer technology, gear measuring technology is more consummate. The gearmeasuring include complex error measuring and monomial error measuring. The monomial errormeasuring has been used widely, because it can have a good guidance in machining techniques. The gear measuring based on coordinate method can finish the measurement with a high precision. So, studing the system of the gear measuring process controlling and data processing has very important practical meaning.Based on the available 3001 omnipotent gear measuring machine and analysis of measuring principle and technology measuring method of large gear has been researched in this paper in-suit measurement of cylindrical gear based on measure every tooth by coordinate is presented and practiced consequently. Every tooth profile error was acquired in the positive travelling of measuring ball;and every pitch error was acquired in the backstroke of measuring ball. And then ,the gear whole error was obtained by integrating tooth profile error and pitch error into a same coordinate system with mathematical operation.The realization method of setting up a measuring and controlling system of the omnipotent gear measuring machine was discussed, basing on motion control and combining with probe measurement techniques to correct errors. The open control system, status inspection and control system, data collection system were established according to the mechanical characteristics. The hardware condition of automatic measuring cylindrical gear was founded by these means.Basing on the criterion of software engineering, the codes of measuring and controlling system were written, which was a part of user application software in gearmeasuring center. It includes data collection program, status inspection and control program,motion control and user interface program etc. Working together with the hardware, the functions of measuring errors in involutes cylindrical gear were accomplished.And the paper focuses on the system design requirements and scheme, the working principle of the optical grating ruler, the sense finding and digital subdivision technology for the grating Moire fringe signal, and the hardware and software design of the system. And in the meantime, put forward an algorithm of digital subdivision and identifying direction about phase sector on which based Cohen-Sutherland code theory. The algorithm can drive grating signal 800 subdivide and technology of reversible Count using software. Moreover, it is merely require to revise subdivided software to add the grating signal subdivided figure. The paper study the basic theory of column gear measurements, making the omnipotent gear measuring machine as the hardware platform, the gear measuring data processing and the error appraisal mathematical model is established. In the system software ,system measuring and control platform has been established based on Visual C++ 6.0 and Sql Sever 2000.The data acquisition and movement controlling have been realized,and the software of in-suit profile measurement of large gear has been developed. Finally, real-time data acquisition display,error assessment, measure_ ment results display and reports print have been realized in the software system.During the design and development of the omnipotent gear measuring machine,it shows that the principle is correct and the technology is feasible based on a large amount of experiments and analysis. The test demonstrates that the entire system stable and reliable, and essentially meet the design requirement which the paper was expected propose.
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