Extruded boss on the sphere - CATIA V5 Exercise - 2D into 3D modeling

In this guide are displayed CATIA V5 steps that are required for extruded boss/base to the sphere surface and modeling of the overall model based on technical drawings.
2D into 3D solid modeling. Example of exercise.
3D Modeling:
Features to be used:
Sketch, Shaft, Boss-Extrude, Reference Geometry - Plane, Linear Pattern, Mirror Feature, Mirror Body, Hole, Hole with thread.

  1. Step 1:

    One of the most important steps is the introduction of the tangential plane at the spherical surface.
    Watch this video. Thanks.