When attacking M2～M4 stainless steel workpieces, the taps are thin, the head tapping and cutting amount is large, and the stainless steel material is difficult to process. The workpiece has poor thread roughness, tapping and broken taps. In order to change this situation, I grind the cutting edge of the tap tap to 1/3 (see picture), and then use the oil stone to grind the back corner of the tap a few times, so that
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