Although a simulator is sometimes useful for training the operation of man-machine system ,its application to machine tool operation has been hardly studied so far. In this paper, the authors propose a method for high efficiency skill training of small-diameter deep-hole drilling by using the simulator developed previously. For the training system, a function to display an ideal operation pattern and difference from that of a trainee graphically has been added to the simulator. A new index for evaluating the skill level has been also introduced by using this difference. As the results, it is found that 10 to 15 times of training using he simulator improves trainees' skill. In addition, the training by the simulator with emphasized sensory display together with the normal simulator is highly effective to overcoming saturation of skill level.
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