Pare wood with knife, show up column lead core 3mm,then place sand paper on the firm surface, plumb core by sand paper ,mill slowly until penpoint become plane. fringe is sharp.

• 用削笔刀削去木干部分，使铅芯呈圆柱状露出约3mm，然后在坚硬的平面上放置砂纸，将铅芯垂直靠在砂纸上画圆圈，慢慢地研磨，直至铅笔尖易磨成平面，边缘锐利为止。