Grinding the drill bit, how can grinding, and the method of quick crash is what ah?
By the back edge grinding behind. This is the slow grinding of the entire flank from the edge of the bit. It is easy to dissipate heat and grind. Based on the stability of the consolidation of one or two of the formula, the drill can be gently contact for a relatively small amount of grinding wheel, grinding, grinding to observe the uniformity of the spark, to adjust the size of the pressure, and bit cooling. When the cooling start again after grinding, to continue to set the formula to the one or two position, it is often in the beginning is not easy to grasp, often can't help to correct change their positions.
Deviation angle of drill shaft." Here is the relation between the axis of the drill bit and the surface of the wheel. "Frontal angle", that is, the top angle of 118 degrees + 2O half, about 60 degrees, this position is very important, directly affect the drill point size and the main cutting edge shape and cross blade edge angle. Often. One and two refers to the relative position of the drill before sharpening, and the two should take overall consideration, not to set aside the edge of the knife and ignore the angle of setting or to lay the oblique axis and ignore the blade. These errors are often present in actual operations. At this point, the drill is ready for contact with the wheel in place of the correct position.
The edge of the wheel is fixed by the blade." This is the first step between the bit and the grinding wheel. It is often the case that the blade has not been settled so that it is sharpened by the grinding wheel. It must be hard to wear. The "edge" here is the main cutting edge, and the "cut out" means the main cutting edge of the grinding part is in the horizontal position. "Wheel surface" refers to the surface of the grinding wheel. "By" means slowly moving closer. The drill cannot contact the grinding wheel at this time.
