L1— total length of brazed abrasive drill; l1— length of the working part of brazed abrasive drill; 2Φ1— apex angle of the cone; d1— substrate diameter of brazed abrasive drill; ht1—protrusion height of single abrasive particle of brazed abrasive drill; H1— line spacing of diamond abrasive particles of brazed abrasive drill; h1— space between diamond rows of brazed abrasive drill; D1— mean diameter of the brazed abrasive drillFig. (3) Geometric structure of brazed abrasive drill.