3.齒頂(冠)圓錐角

變數Ⅰ

Re =

= 41.777

sinθa = 2.5 / 41.777

θa = sin-1( 2.5 / 41.777 )

= 3.425˚

件3的齒頂圓錐角 = 節圓錐角(θ) + θa

= 38.928˚ + 3.425˚

= 42.352˚

變數Ⅱ

Re =

= 41.552˚

sinθa = 2.5 / 41.552

θa = sin-1( 2.5 / 41.552 )

= 3.443˚

件3的齒頂圓錐角 = 節圓錐角(θ) + θa

= 43.781˚ + 3.443˚

= 47.224˚