How do novices master the sharpening skills of twist drills?

The grinding quality of drill bit directly affects the quality and efficiency of drilling. If the drill bit is not well ground, the hole will be out of round and the hole wall will be rough.

Usually, a drill bit only grinds two flank surfaces, but at the same time, the top angle (the top angle of a standard twist drill is 1 18), the back angle and the inclination angle of the cross blade should be correct. There are two main methods for sharpening drill bits:

One is grinding from the side.

One is sharpening from the main cutting edge.

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