Biomass material grinding process is an important step to make best quality wood pellets because some raw materials are not available for wood pellet mill directly, such as wood blocks, wood logs, grains as well as other large size woody materials. These kind of materials need to be crushed into sawdust firstly with electric wood hammer mill. This electric wood hammer mill is used to crush raw materials with diameter of less than 50mm, while wood crusher is suitable for wood materials with diameter of 50-200mm.