* The point angle of drill is from 95°to 135°。
* While grinding, don’t hold the stem of drill, it will affect the accuracy.
D. Grind the lip relief angle
Put the chuck set into the lip relief ange grinding shelf. The slot of clamping
nut must fit with the pin of the grinding shelf. Insert the drill gently into
grinding shelf until reach the grinding wheel. Grind the drill by moving left
and right until the grinding sound disappears. And then turn to the other
side, do the same to grind the drill.
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