During the production and manufacture of cemented carbide bit, the main cutting edge of the bit will produce many burrs, so the burrs are fine. Under a hundred times microscope, the cutting edge of the bit will be serrated. If not removed, it is easy to produce the phenomenon of jumping edge falling

cemented Carbide left-hand drill, the biggest feature is high hardness, wear-resistant, long service life, the disadvantage is brittle, easy to break. High-speed steel left-hand drill is characterized by good toughness, HIGH-COBALT M42 material manufacturing hss steel left-hand drill has a higher hardness, the use of appropriate cutting dosage and smaller hole diameter on the use of automatic lathe drilling more reliable. All these two kinds of left drills have their own characteristics and can be selected flext-hand drill and HSS steel left-hand drill is often somewhat hesitant. The following is a brief int