... coarse grinding, used to give knife edge or repair the seriously damaged edge, suitable for blunt knives.Hold the ... an angle of 10 - 30 °, grind the edge on the surface of stone back and forth with ... gentle pressure, and sharpen it until the edge sharp enough.After sharpening the tool, it needs ... grinding, a necessary step to eliminate burrs of the edge.Use more gentle pressure, repeat step 1, and ...