Normal chordal thickness 法向弦齿厚 ; 法面弦线齿厚
chordal tooth thickness [机] 弦齿厚
outer chordal thickness 大端弦齿厚
Normal l chordal thickness 法向弦齿厚
normal chordal tooth thickness [机] 法向弦齿厚
Transverse chordal tooth thickness 端面弦齿厚 ; 弦齿厚
noumal chordal tooth thickness 法向弦齿厚
There is only approximate way to work out the normal chordal tooth thickness of worm and wormwheel at present.
目前所见到的圆柱蜗杆蜗轮分度圆弦齿厚计算公式均为近似公式。
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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