STEP 5

While the light is on and the motor rotation is stable, put the chuck set into shelf grinding. The slot of fix clamping nut is fitted with the two pins of shelf grinding. Put the drill gently into shelf grinding until reach the grinding slip. Grind the drill by moving left and right until the noise stop. And the turn to the other side. Grind the drill with the same way.

The smallest grinding size of drill is 2mm.

The point angle of drill is from 118 to 135 degree.