The drill shaft is slanting out of the front angle.." Here is the relation between the axis of the drill bit and the surface of the wheel. "Frontal angle", that is, the vertex angle of 118 degrees + 2O half, about 60 degrees, this position is very important, directly affect the top of the drillAngle size and main cutting edge shape and cross edge angle. To remind students to remember a commonly used 30 degrees, 60 degrees, 90 degrees triangular plate angle of 60 degrees, students easy to master. A formula and formula two refers to the relative position of the grinding beforeThe two should take overall consideration, and don't neglect to set the oblique angle in order to settle the edge of the blade, or ignore the edge of the blade in order to set the oblique axis. These errors are often present in actual operations. At this point the drill is in the correct position
A formula: "edge on the wheel surface." This is the first step between the bit and the grinding wheel, and it is often the students who have not cut the edges of the blade, so they start sharpening on the grinding wheel. It must be hard to wear. The blade here
Grinding twist drill with four formulas, here using four formulas to guide the grinding process. Better effect.
