Papers by Keyword: Gear Measurement

Abstract: Conoprobe is used for non-contact measurement utilizing conoscopic holography technology, which has characteristics of high measurement precision and large measuring angle range. However, the conoprobe performs inaccurate and instable in gear measurement applications. To verify its accuracy, an experiment setup is built using high performance coordinate measuring machine (CMM) to measure surfaces of gaugeblocks that have similar material as gear workpieces. Compared the collected data from the CMM with the conoprobe values, those problems mentioned above are validated. In this study it can be stated that measuring accuracy of conoprobe drops dramatically when measuring bright metal surfaces, and even its measuring error could be more than dozens of microns when the measurement is in large angle, therefore it is completely not fit for precision measurement applications.

Abstract: A orthogonal-shaft face gear drive with spur involute pinion is considered. The mathematical model of the face gear tooth flank was studied and the correction parameters was taken into account. The measurement grid schema was accomplished on the rotary projection of theoretical tooth flank, with the real tooth flank data from three-dimensional measuring machine or gear measuring center, the tooth flank deviation could be calculated. The effect of correction parameters on tooth flank deviation was investigated and the correction method for the single index generating grinding was proposed. Finally a numerical example was presented and the results show that the method proposed can decrease the tooth flank deviation.

Abstract: Many different methods have been developed for the measurement of transmission error (T.E.) at gears meshing. Each strategy improved the measurement performance is based on comparing the phases of sequence signals by counting the number of encoder pulses. The phase comparison method of T.E. is a dynamic measurement algorithm with lower angular resolution and many constrained conditions. This paper presents a new numerical algorithm aimed to provide the high accuracy information of instantaneous T.E. in the form of angular displacement. The analysis approach uses phase shift and demodulation technology in frequency domain to process the signals generated by encoders fixed on the both shaft of the gear driving mechanism. Finally, the algorithm is tested by simulation of gear meshing signal in Matlab software.

Abstract: The detection technique of small module gears has a very important research and application value. In this paper, a composite measuring method is presented based on combining traditional mechanical contact measurement with optical image non-contact measurement. First of all, this paper analyzes the basic principle of composite probe composed of optical fiber stylus and CCD imaging system. The tail-end of the stylus is shaped into a micro-sphere, where a small refection mirror is designed. When the laser is transmitted through the fiber, a round facula can be seen from the CCD camera. The micro-sphere is kept contact with the surface of the measured gear at the time of measuring and the error of the measured gear will be reflected by the offset of the facula center. Meanwhile, the sub-pixel extraction algorithm for the center of facula image is presented. Then the calibration principle and method of probe system is analyzed in detail. Finally, the data processing principle of the presented method is discussed for gear measurement.