A diamond circular saw blade generates the vibration and the noise when it is rotating at high speed. It is known that the generation of the noise called “whistling noise” causes environmental pollution and reduction of the cutting precision. In this paper, the effects of the frequency and the mode of vibration of the blade on the generation of whistling noise were investigated experimentally and analyzed bx computer simulation, moreover photographing with a stroboscope was performed in order to study the relationship between the whistling noise and the air flow around the blade. According to the observation of the mode of vibration and the air flow around the blade, it was found that the nodal diameter exists every segment part and the vortex of air exists near the slit when the whistling noise is occurring. It was certified that the generation of whistling noise was caused by the vortex of air due to the flexuous vibration of segment part.
