This paper introduces the auto measure system of the unity error parameter of the precision gear. This system has a good interface , a good display can be easily used. By overcoming the defects of conventional devices, this measurement system is more practical. The measurement and calculation methods are discussed ,along with the structure chart of the hardware , the flow chart of the system software on the basis of VB and some programs.
The system is programmed using Visual Basic 6.0 and it can be divided into five modules according to the different method of measurement: Main window body, the single circle circular pitch accumulated error measuring module, the radial jitter error measuring module, the single tooth strobe measuring module and the circle circular pitch error measuring module. According to carrying out the dissimilarity of the function, the system can be divided into two modules: The data processing module, the display module.
Keywords：unity error parameter ,；the gear klot parameter, error measure,；Visual Basic 6.0 programming； Rectangle graph display
