Two types of sensor fusion approaches are reported for quality assurance based on the decision making process via the sensor fusion technique: quasi-sensor fusion with several data-processed signals from a single sensor and general sensor fusion using multiple sensors. The former method may be expected to provide new information about an object to be measured from a single sensor, i.e., a strain gauge in this study. The latter method with a tool dynamometer and a strain gauge is, on the other hand, important on a practical production floor for real in-process measurement. Experimental results show the effectiveness of both techniques.

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