蝸桿螺紋數 N = 1
模數 M = 3
齒數 Z = 30
蝸輪面角度 X = 80
直徑係數 Q = 9.5
蝸桿螺距 P = Pi * "M"
蝸桿螺旋長度 E = 2 * "Z" + ("M"/2)
齒冠 S = "M"
蝸輪節圓直徑 Da = "M" * "Z"
蝸桿節圓直徑 De = "M" * "Q"
蝸輪喉徑 Db = ("Z"+2) * "M"
蝸輪外徑 Dc ="Db"+("De"-2*"S")*(1-Cos("X"/2))
蝸桿外徑 Df = "De"+2*"M"
中心距離 C = ("Da"+"De")/2
導程 L = "N" * Pi * "M"
蝸桿螺旋角 Y =atn("M"/"De")
法向模數 Mn = "M" * Cos"Y"