Generating addendum modification coefficient (with allowance)

The addendum modification coefficients x_F are relative to the finished gear. They can be calculated from, for example, the actual base tangent length.

The input options correspond to those of the addendum modification coefficient of the nominal gear. 

From the addendum modification coefficient x_E of the finished gear, the corresponding nominal addendum modification coefficient x is determined for the selected tooth size dimension. Then the sum of the nominal addendum modifications is used to determine the nominal addendum modification coefficient of the mating gear.