How to orient a curvy part in a drawing ?
-> On a rectangular part 1.) I click on the large plane surface of a part
and then 2.) I select a straight X-vector line from the part.
What NX 9.0: "Normal direction" and "X direction" mean in a common sense ?
They are unknown definitions to me. Are they NX only terms ?
No such things in Inventor or Pro-e or such...
The normal direction is the direction on your curvy part that you want to point normal to the drawing.
The X direction is the vector on you curvy part you want to point to the right.
If there is nothing useful to select then it could help to create a datum CSYS in the orientation that you want your view (like Z for sheet normal and X as right direction). You can then select two axes of the datum CSYS to orient your model.
The CSYS can be put on a layer you turn off later.
I prefer DickBaardse's solution, but if using the master model method, you can alternatively use Move Component and locate your component to the correct posiition for your Top View , etc..
Either will work fine.