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1·The spiral angle of graduated circle was rough estimated by measuring the addendum circle diameter and modified on milling machine.

测量齿顶圆直径估算分度圆螺旋角，用分度头在铣床上修正分度圆螺旋角，并进行误差分析。

2·The computing formula of theoretical cone angle of the wormwheel addendum cone and dedendum cone can be derived yet.

推导出蜗轮齿顶圆锥的理论锥角计算公式及齿根圆锥的理论锥角计算公式。

3·High tooth gear has small module, small pressure Angle, and large addendum to enlarge the transverse contact ratio, improve gear strength, and reduce the noise.

细高齿齿轮是采用小模数、小压力角、大齿顶高来加大端面重合度，达到提高齿轮强度、降低噪声的目的。