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。
2
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.