How to Grind a Wood Drill Bit?
Grinding method: When grinding, keep the main cutting edge on one side of the drill bit horizontal and slightly higher than the horizontal plane passing through the center of the grinding wheel. High side defects. Maintain the correct angle between the drill bit axis and the grinding surface of the grinding wheel (half the drill tip angle). With the right hand in front and the left hand in the back, hold the drill bit and contact the grinding surface of the grinding wheel. The right hand rotates the drill bit around its own axis according to the rotation direction during work, applying appropriate pressure. The left hand moves downward synchronously with the right hand, and the left hand moves downward. The amount of pressure and pressure depends on the size of the angle. Large-diameter drill bits should be moved laterally and ground on both sides frequently. When the drill tail swings, it must not exceed the horizontal plane to prevent negative relief angle grinding. When the cutting edge is about to be ground, it is not advisable to grind from the back of the knife to the cutting edge to avoid annealing of the cutting edge. For small diameter drill bits, do not pick up the drill bit after grinding one side, just turn to the other side to grind. Since the hand position remains unchanged, the two main cutting edges of the drill bit are not prone to one being higher and the other being lower. When grinding a chisel edge with a small diameter drill, it is easy to control the width and symmetry of the chisel edge from the outside of the side and then move to the corner of the grinding wheel. Controlling the amount of grinding is not easy. For large-diameter drill bits, the chisel edge can be shortened directly with the grinding wheel fillet.