橡胶垫钻头采用调质钢经车削制成,其内有定位针2和弹簧4,钻头柄上端用铆钉1铆死。使用时,先将橡胶垫用图钉固定在平整的木块上,钻头柄部用钻夹头装入钻床主轴孔内,中心定位针2对准所要钻削的孔中心,即可钻孔。其卸料由弹簧4自行顶出定位针2完成。 Rubber pad drill made of quenched and tempered steel by turning, which has a positioning pin 2 and spring 4, the upper end of the bit shank with rivets riveting. When using, the rubber pad is fixed on the flat wood block with a pushpin, and the drill shank is inserted into the drill spindle hole by a drill chuck, and the centering pin 2 is aligned with the center of the hole to be drilled for drilling. Its unloading by the spring 4 self-ejecting pin 2 to complete.