To reduce the noise of woodworking machinery, sound intensity (SI) measurements were made first for a circular saw machine to grasp the characteristics of the sound emissions and their flow states. We measured the sound of the rotating equipment without a working table and attached devices from a circular saw bench and that of the whole equipment, that is, a circular saw bench, 175 and 490 mm apart from the saw blade. The results are summarized as follows: (1) The sound was emitted radially from center of the circular saw towards the periphery, and the highest sound intensity level (SIL) was measured at 7 o'clock on the saw. As the maximum SIL in the isophonic contour diagram and the emitting direction in the vector diagram were changed by the measuring distance, it was suggested that the shorter the distance between the microphone and the measured objects, the easier the determination of the direction of the sound is. (2) There was a large difference between the SI above and under the working table of the circular saw bench. The SIL above the working table was less than that under the table, and the SI vector was directed from the diving side of the teeth to the rising side. The highest SIL under the working table was measured on the door of the dust collecting hood, and the SI vector under the table was directed to the same area of the results stated in (1).
