1. Soak the millstone in water for one to five minutes. When there is oil, you can use some vegetable oil or other grease as lubricant.

2, fixed oilstone, fixed with wood or base.

3. Press the blade on the grindstone at an angle of fifteen degrees.

4, grinding from left to right or from right to left, do not plan up and down, easy hob, uneven grinding.

5. When the brightness and sharpness of the blade begin to strengthen, it can be re-polished by changing the density.

A millstone is a stone used to sharpen a knife. Any sandy rock can sharpen a sharp knife-gray clayey sandy rock may be the best. The timing is not bad, but it is rare. Granite can also be used. The key is that the grinded blade must be sharp and durable, and it is not easy to produce nicks.