constant chord
... 分度圆锥面Reference cone 涡轮Worm wheel 固定弦齿厚Constant chord ...
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渐开线锥形齿轮由于同时存在锥度和螺旋角，使得其固定弦齿厚无法精确测量，也没有公法线。
There is no common normal in the conical involute gear and the fixed chordal tooth thickness can not be measured accurately because of the coexistence of helix angle and taper.
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