Thank you very much for replying. I thought i was pretty explicit, but it doensnt seem to be the case...No problem, i ll try to be more concise.
Regarding your 1st paragraph, is not what I want at all, in fact that is what is already in the picture of previous attachment.
What i want is a radial offset. To help you better picture it, imagine u give thickness to this shape inwards.
I want that curve on the edge of the inner wall.
How do i achieve such curve, which is a offset of the edge u see highlighted on the pic attached?
How to do it in CREO?, I know fully well how to do it in Catia or NX, or alias.
Not in Creo, as i am learning it.
Thank you!
I see. I have done this in several ways but not with an offset of the existing edge in the way you are trying to do it. For some reason, Creo doesn't know how to make that edge smaller... only larger.
However, it is easy to achieve what you want with a projection rather than an offset. In this case, you would offset the edge in the sketch. You can then project it on that inner surface.
I was able to achieve the same as you describe by offsetting the outer surface toward the inside. Not quite as straight forward as the surface must intersect the inner surface. Never the less, it too created the offset you want, and probably more accurately.
In the following image, you can see various offset edges. You can offset the edge from the inner surface or the outer and they will behave differently. But they must both grow "outward" for some reason.
The stepped flange was done with an offset; the top surface was the original cutting plane. The inner surface was an offset from the outside but it can be any intersecting plane.
I find it very difficult to work with curve geometry when creating surface features. The only place that the curves are useful is in 2D (sketch). However, the offset command does have some very powerful features to properly map 2D onto surfaces. But whenever you, you want to manipulate surfaces with surface rather than curves.
