I have question. Are the faint lines that appear in the borders of the middle patch (created by a sweep of one curve and two edges as profiles, with tangent option activated), a result of imperfect tangency or simply the outcome of having a second surface created inside another one?
If I were to manufacture that part would those lines be there?
Yes I realize that I can trim that patch a notch lower with 2 curves and then blend but I think that creates a tiny, tiny buldge plus the edges on the vertical sides create a small opening that is quite visible even with an additional cut and blend.

Thanks

Hi niko,

> a result of imperfect tangency or simply the outcome
> of having a second surface created inside another one?

Looks like imperfect tangency.


> If I were to manufacture that part would those lines
> be there?

It really depends on which manufacturing method you were using.

But it's not too likely that such a small subtle detail like that is actually going to come through the manufacturing process.

- Michael

Ok what can I do to perfect this, short of using the cut and blend method?
The middle (kink curve) is the outcome of a projected curve on the bigger surface(after the initial cut), then blended and then points moved or cutting and orienting a smaller section curve and then blending it again.
I hope that makes sense Michael..
Thanks in advance.

Hi niko - the easiest thing is to not worry about it - if you are manufacturing this part there is no way that tiny level of detail is going to make it into the end result.

Otherwise if you want to get a smooth result between pieces you need to use Fillet or Blend to generate continuous surfaces, other techniques won't work.

- Michael

Or also you might want to use Rhino and try the MatchSrf command in Rhino which is an editing tool that adjusts an untrimmed edge of one surface to be smooth with another. It could help you in this kind of situation.

- Michael