(57) [Abstract] [Purpose] The vibration generated from the contact portion between the rotary dresser and the grinding wheel is to be detected without passing through the liquid. [Configuration] In addition to providing the vibration detecting means for detecting the vibration generated from the contact portion between the rotary dresser 10 and the grinding wheel 18 in the interior of the rotary dresser 10, and extracting an output signal of the vibration detection means via a slip ring 32 It was way.
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