| 摘要 |
The invention relates to a drill used for dry drilling, characterized by the asymmetry of those cutting edge parts only whose faces are in the drill core (8) area, in particular its entire chisel edge (9). This asymmetry can result from the fact that individual chisel edges (11, 12) have different lengths. For example, the different lengths of the individual chisel edges (11, 12) are indicated by the dimensions (A) and (B). |
