Helical Gear Generator Fixed -

[ x = r_b \cdot (\cos \theta + \theta \sin \theta) ] [ y = r_b \cdot (\sin \theta - \theta \cos \theta) ]

where ( r_b ) is the base circle radius and ( \theta ) is the roll angle. For helical gears, the transverse pressure angle ( \alpha_t ) relates to the normal pressure angle: helical gear generator

[ \tan \alpha_t = \frac\tan \alpha_n\cos \beta ] [ x = r_b \cdot (\cos \theta +