... Normal space-width taper 正常齿槽宽收缩 Normal thickness taper 正常齿厚收缩 Normal tilt 法向刀倾 ...
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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.
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。
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