![]() the tail of drill bit must not be tilted above the horizontal centerline of the grinding wheel, otherwise, the cutting edge will be blunt and unable to cut. However, the hand holding the handle cannot swing, and the rear handle must be prevented from tilting upward, i.e. The main cutting edge should swing up and down on the grinding wheel, that is, the hand holding the front of the drill should make the drill bit swing up and down on the grinding wheel surface evenly. This is a standard action for drill grinding. The cutting edge should swing up and down, and the tail of the drill bit should not be tilted. ![]() Do not neglect to set the angle for setting the cutting edge, or neglect setting the cutting edge for the angle.ģ. Both should be considered in an all-round way. This angle( 60 degrees ) is the point angle of the drill bit, which directly affects the size of the top angle, the shape of the main cutting edge and the angle of the chisel edge. This refers to the positional relationship between the axis and the surface of the grinding wheel, which can be seen accurately at 60 degrees. Attention should be paid to the relative horizontal position and angular position before sharpening. The axis of the drill bit should be inclined at an angle of 60 degrees to the grinding wheel surface. If the back angle is ground suitably, the front tip is centered, and the two edges are symmetrical when drilling, chip removal is brisk, the drill bit has no vibration, and the hole diameter will not be enlarged.Ģ. If the angle is small, the axial force during drilling will be very large, causing that it is not easy to cut in, the cutting force increases, the temperature rises greatly then the drill bit heats up seriously, and even it cannot be drilled. If the angle is large, the edge will be too thin, the vibration will be severe during drilling, the orifice will be triangular or pentagonal, and the chips will be needle-shaped. ![]() The back angle of cutting edge is generally 10-14 degrees. It must be ensured that the cutting edge is in the middle of the axis and the edges on both sides should be symmetrical. An experienced technician will see the symmetry of tip against the light and slowly grind it. Ensure that the blade tip is opposite to the axis and both sides are symmetrically, then slowly repaired. Once the methods are got, the problem will be solved easily.ġ. Although it has a simple structure, it is not easy to sharpen indeed. The key lies in mastering the methods and skills. The twist drill bit is a kind of common drilling tool for machining.
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