How to grind teeth with woodworking band saw?

Who is the band saw operator? What does "eight-character mill" mean? According to the hardness of cutting materials, the specific requirements for grinding teeth with woodworking band saw are as follows: soft materials: tooth height 1/2~ 1/3 pitch; The radius of tooth root arc is not more than 3.5 mm; The angle of the tooth tip is 30-45 degrees; The tooth back angle is 15~30 degrees; The front angle is 20~35 degrees; The front angle of the tooth is 55~70 degrees. Hard material: tooth height 1/3~ 1/4 pitch; The radius of tooth root arc is not more than 3.5 mm; The angle of the tooth tip is 40-55 degrees; The tooth back angle is 20~35 degrees; The front angle is 5~25 degrees; The front angle of the tooth is 65~85 degrees. The grinded saw blade can ensure the normal operation and safe operation of the band saw,