Abstract:In order to solve the problem that the existing dial indicator cannot provide the standard current in terms of the measurement of spindle radial pulsation, this paper proposes a method that a slide variable and precise resistor which is processed by special technology can be embedded into the traditional mechanical device. The micro variation of resistance value can be converted into voltage signal by means of the bridge circuit, and the resistance value is linearized by using the operational amplifier in accordance with its special properties, forming the interface signal conforming to the international standard. And then on this basis the threelayer network system composed of base measurement, data processing and real time monitoring is established. The function of the network is aiming to realize the remote data acquisition, signal transmission, numerical calculation and image processing. The comparative experiment between the newly designed instrument and standard grating ruler shows that the output value of the variable resistor and the liner mechanical displacement can present the strict correspondent relationship with each other and so as to lay the important foundation from experiment study at laboratory to practical application related to remanufacturing. The research results give that, compared with the traditional method, the new approach pays more attention to collect massive data and form appropriate sample collection to establish a suitable mathematical model. It depends on the fitting circumstances between the constructed curve and the observation point to further optimize the model and then predict the future trends, which can detect internal defects hidden deeply, so that the valuable reference information for guiding the maintenance works can be provided.