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Whetstone working sound...
The sound of the HCR4000 whetstone grinding the steel... 
The subject was a 1.4116 steel with a hardness of 55-56HRC, which is typically the average hardness of German stainless steel kitchen knives. In this video, the point was NOT sharpening, but I wanted to show how the Haidu whetstone works, because the sound is not visible or audible in the photos.