This angle is the sharp angle of the drill bit. If the angle is not correct, it will directly affect the size of the top angle of the drill bit, the shape of the main cutting edge and the bevel of the chisel edge. This refers to the position relationship between the axial line of the drill bit and the surface of the grinding wheel. It is OK to take 60 °, which is generally more accurate. Attention shall be paid to the relative horizontal position and angle position of the drill before sharpening. The two positions shall be considered as a whole. Do not neglect to set the angle for the sake of setting the cutting edge,dhd drill bit, or neglect to set the cutting edge for the sake of setting the angle. 3. After the cutting edge contacts the grinding wheel, grind from the main cutting edge to the rear, that is, start from the cutting edge of the drill to contact the grinding wheel, and then grind slowly along the entire rear face. When the drill bit cuts in, it can gently touch the grinding wheel,dth rock bit, first carry out a small amount of sharpening, and pay attention to the uniformity of sparks, adjust the pressure on the hand in time, and pay attention to the cooling of the drill bit, so as not to let it grind too much, resulting in discoloration of the cutting edge and annealing of the cutting edge. When the cutting edge temperature is found to be high, the drill bit should be cooled in time. 4. This is a standard drill grinding action. The main cutting edge should swing up and down on the grinding wheel, that is, the hand holding the front of the drill should evenly swing the drill up and down on the grinding wheel surface. However, the hand holding the handle should not swing, DHD Drill bit ,Tapered Rock Bit, and the rear handle should be prevented from warping upward, that is, the tail of the drill bit should not be higher than the horizontal center line of the grinding wheel, otherwise the cutting edge will be blunt and unable to cut. This is the most critical step, and whether the drill is well or not has a lot to do with it. When the grinding is almost done, start from the cutting edge and rub it gently to the back corner to make the back of the blade smoother. 5. After one cutting edge is ground, grind the other cutting edge. Ensure that the cutting edge is in the middle of the drill axis and the cutting edges on both sides are symmetrical. Experienced masters will look at the symmetry of the drill tip in the light and grind it slowly. The clearance angle of the cutting edge of the drill is generally 10 ° -14 °. If the clearance angle is too large, the cutting edge will be too thin, the vibration will be severe during drilling, the orifice will be trilateral or pentagonal, and the chips will be needle-shaped; if the clearance angle is small, When drilling, the axial force is very large, it is not easy to cut in, the cutting force increases, the temperature rise is large, the drill is heated seriously, and even can not drill. The clearance angle is suitable for grinding, the sharp edge is centered, and the two cutting edges are symmetrical. When drilling, the drill bit removes chips briskly without vibration, and the aperture will not expand. 6. After the two cutting edges have been sharpened, the drill bit with a larger diameter should also be sharpened. After the two cutting edges of the drill bit are ground, there will be a plane at the tip of the two cutting edges, which will affect the central positioning of the drill bit. It is necessary to turn down a corner behind the cutting edge and grind the plane at the tip of the cutting edge as small as possible. The method is to erect the drill, aim at the corner of the grinding wheel, and pour a small groove against the tip of the blade at the root behind the blade. This is also an important point for bit centering and cutting briskness. Note that when grinding the chamfer of the cutting edge, do not grind it on the main cutting edge, which will make the rake angle of the main cutting edge too large and directly affect the drilling. There is no certain formula for the sharpening of drill bits. It is necessary to accumulate experience in practical operation, through comparison, observation, repeated experiments and exploration, and with a certain degree of human intuition, in order to better grind the drill bits. Disclaimer: This article is reproduced on the Internet,mining drill bit, and the copyright belongs to the original author. If copyright is involved, please contact to delete! The content in the article only represents the author's personal views, and the reprint is different from the recognition or holding of the same views on this platform. Return to Sohu to see more Responsible Editor:. wt-dthtools.com