By using it, the model of equal lead on the cutter can be applied to the cylinder, cone and sphere.
通过该模型，分别建立了柱面上、球面上和锥面上球头立铣刀的等导程螺旋线的数学模型。
An electric pencil sharpener USES a toy motor as power and is composed of conic casing with tubular ends, multi-edge cutter for wooden part and a small abrasive wheel for lead core.
一种电动卷笔器，玩具电动机经齿轮减速装置与一中部为锥形，两端为空心圆筒的多刀刃卷笔刀筒机械连接。小砂轮套装在玩具电动机轴上。
An electric pencil sharpener USES a toy motor as power and is composed of conic casing with tubular ends, multi-edge cutter for wooden part and a small abrasive wheel for lead core.
一种电动卷笔器，玩具电动机经齿轮减速装置与一中部为锥形，两端为空心圆筒的多刀刃卷笔刀筒机械连接。小砂轮套装在玩具电动机轴上。
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