Rough Grinding Stone

A rough grinding stone is a type of whetstone used in the knife-sharpening process. The coarse grain of a rough grinding stone is suitable for sharpening the edge of a knife. The following is a description of the characteristics and usage of a rough grinding stone.


  1. Coarse grains: Rough abrasive stones have coarse grains and can quickly sharpen the cutting edges, typically around No. 200.
  2. High grinding power: Rough abrasive stones, with their coarse grains and rough surfaces, provide effective grinding power for shaping cutting edges and repairing damaged areas.


  1. Soak in water: Before using a rough grinding stone, soak it in water. Water serves to release frictional heat on the surface of the whetstone and prevents overheating during the sharpening process. As you grind, the mud is released, allowing you to sharpen knives more efficiently.
  2. Sharpen at the Correct Angle: When sharpening knives with a rough grindstone, it is important to sharpen the knife at the correct angle. In general, hold the knife at an angle of 20 to 30 degrees and sharpen it by moving it back and forth on the whetstone.
  3. Uniform sharpening: It is important to apply force evenly to sharpen the edge of the knife. Keep in mind that the entire surface of the knife should be sharpened evenly.
  4. Finishing with a medium grit stone: Once you have finished sharpening the edge with a rough grit stone, it is recommended that you then use a medium grit stone to finish the blade. The medium grit stone has a finer grit and is responsible for smoothing the edge of the blade.

The rough grindstone is used at the beginning of the knife sharpening process and serves to sharpen the cutting edge. Proper sharpening and use of the whetstone can restore the sharpness of the knife.

*This is a translation by a translation tool.