The drill bit should be a very common tool, among which the drill bit we have heard the most is the wood auger drill bit . However, it is easy to buy a drill bit, and subsequent maintenance and maintenance are not easy. Among them, grinding the drill bit is also a technical task.

The sharpening quality of the drill bit affects the drilling accuracy and the working ability of the drill bit. If the symmetrical configuration of the drill bit edge (or guide center) relative to its axis slightly deviates, it will cause the deflection of the drill bit during the working process. Decrease drilling accuracy. The sharp angle of the cutting edge of the drill depends on the quality of sharpening, material properties, and the geometry of the cutting part of the drill.

The two cutting edges should have the same length; the inclination angles of the two cutting edges relative to the axis of rotation of the drill bit should be the same; the chisel edge of the drill bit should be in a straight line after sharpening, and its center should be consistent with the axis of rotation of the drill bit. The transverse drill bit needs to sharpen the guide center, sinker knife, and cutting edge separately. The main blade is sharpened from the back, the sinking knife is sharpened from the inside (round and toothed sinking knives can be sharpened by hand with a smooth file or a hand file, and then polished with oilstone), and the guide center is to sharpen the tapered surface, The correctly ground guide center should have a symmetrical configuration surface, and the cone center of the cone should be consistent with the drill bit axis.

In addition to the wood auger drill bit, the HSS cobalt drill bit , which is known for its hardness, is also a very popular product.