Fried Dough Twists drill is a commonly used drilling tool. Although its structure is simple, it is not easy to sharpen it. The key lies in mastering the methods and techniques of sharpening, and once mastered, problems will be easily solved.

The top angle of Fried Dough Twists drill is generally 118 °, which can also be regarded as 120 °. The main techniques for grinding drill bits are:

1. The cutting edge should be level with the grinding wheel surface. Before grinding the drill bit, first place the main cutting edge of the drill bit on a horizontal plane with the grinding wheel surface, position it properly, and then slowly lean against the grinding wheel surface.

2. The axis of the drill bit should be inclined at an angle of 60 ° with the grinding wheel surface. This angle is the sharp angle of the drill bit, which directly affects the size of the top angle of the drill bit, the shape of the main cutting edge, and the inclination angle of the lateral edge.

3. Grind back from the blade edge. After the cutting edge contacts the grinding wheel, it should be ground from the main cutting edge to the back surface. When the drill bit cuts in, it can gently touch the grinding wheel. First, perform a small amount of grinding, pay attention to the uniformity of the sparks, adjust the pressure on the hand in a timely manner, and also pay attention to the cooling of the drill bit. Do not let it grind too hard, which may cause discoloration of the cutting edge and lead to annealing of the cutting edge. When a high temperature is found at the cutting edge, it is necessary to cool the drill bit in a timely manner.

4. The cutting edge of the drill bit should swing up and down, and the tail of the drill bit should not be raised. This is a standard drill bit grinding action, where the main cutting edge swings up and down on the grinding wheel, while the hand holding the handle cannot swing. It is also necessary to prevent the back handle from tilting upwards, that is, the tail of the drill bit cannot be raised above the horizontal centerline of the grinding wheel, otherwise it will make the cutting edge dull and unable to cut.

The above are the relevant skills of Fried Dough Twists drill sharpening, and I hope it will be helpful to everyone.