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Nothing is certain in the design process, especially if one has to start from only photos to design from.
The power of the 3D design is not in the making of a drawing, but to the easy way of applying changing to the design. For instance, the ball-bearing that is needed in the middle of the steering column has a different diameter than imagined. We go into the 3D model and choose the cylinder needed for the bearing. The software program (here CATIA V4) shows the size of the hole:
We select "R1 = 20.000" and then we type "30" and voila!
Now the drawing , we instruct the computer to refresh the views and voila!
