【變數X1】件2：法面模數3，螺紋數1 件3：齒數32
蝸桿之導程角 tanθ=L/(π*d')
蝸桿導程 L=P(1線螺紋)
tanθ=P/(π*d')
(軸向)節距 P=π*Ms
tanθ=π*Ms/(π*d')
tanθ=Ms/d'
模數(軸直角) Ms=Mn/cosθ
tanθ=(Mn/cosθ)/d'
sinθ/cosθ=(Mn/cosθ)/d'
sinθ=Mn/d'
sinθ=3/30
=3.01511344577
(軸向)節距P = 3.01511344577*3.1415926535897932384626433832795
= 9.4722582509948293642963438
=9.472
蝸桿節圓直徑 = 30mm【由圖上讀出】
(3.01511344577*32+30)/2=63.24181532442179
=63.242
【變數X2】件2：法面模數2.5，螺紋數2 件3：齒數38
蝸桿之導程角 tanθ=L/(π*d')
蝸桿導程 L=2P(2線螺紋)
tanθ=P/(π*d')
(軸向)節距 P=π*Ms
tanθ=π*Ms/(π*d')
tanθ=Ms/d'
模數(軸直角) Ms=Mn/cosθ
tanθ=(Mn/cosθ)/d'
sinθ/cosθ=(Mn/cosθ)/d'
sinθ=Mn/d'
sinθ=2.5*2/30
=2.5354627641855493252884
(軸向)節距P = 2.5354627641855493252884*3.1415926535897932384626433832795
= 7.9653911934157933631692068
=7.965
蝸桿節圓直徑 = 30mm【由圖上讀出】
(2.5354627641855493252884*38+30)/2=63.173792519525
=63.174
