There is only approximate way to work out the normalchordaltooththickness 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。
2
There is no common normal in the conical involute gear and the fixed chordaltooththickness can not be measured accurately because of the coexistence of helix angle and taper.