Smooth extension needed

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 From:  simba
6863.1 
Hello,

I need to smoothly extend a section by about 20mm-25mm. At the end the extension should be 4mm thick actually about 10mm should be 4mm thick. The extension (red) should smoothly blend into the existing part and extend seamlessly the top surface of the part. The extension should only apply to a certain length of the part.

I have bee playing with cuts, blends, sweeps but didn't get a nice result.

The attached model shows the idea of the part.

How can I partially extend the "edge" of the part with a seamless extension the top surface?

S.
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 From:  Michael Gibson
6863.2 In reply to 6863.1 
Hi simba, I'm sorry but it's not really clear to me yet what you're trying to do here..

By "extension" do you mean you want the red part to increase in length until it matches the rest of the other larger part?

Or do you mean that red part is already the extension that you want to have and you are only focused on trying to blend that with the larger part?

- Michael
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 From:  Michael Gibson
6863.3 In reply to 6863.1 
You might try surface control point editing for what you're describing.

Run Edit > Separate on your part, then run ShrinkTrimmedSrf on it (push Tab and then type ShrinkTrimmedSrf and push enter), then use Edit > Show pts to turn on control points, move only these points over to modify just a range of the surface:






Use Edit> Add pt to add more points to the surface to localize the deformation effect to a smaller region if wanted.


Otherwise if you want to smoothly blend your existing separately created protrusion you'll be looking at using either Fillet or Blend to do that, but it's kind of an awkward position how it's currently situated trying to stick out of a tightly bent area and kind of not fully submerged into it either.

- Michael

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 From:  simba
6863.4 
Hello again,

the red sketch is the envisioned result. I've attached another file which should give a better idea of the requirements.

Basically I need an almost L shaped extension of the edge like the red shape which extends the upper surface like indicated in green and blends into the side (the upper surface points to other parts of my design - blue arrows). At he end the extension should be 4mm thick.

The existing shape must only be modified near the edge for a defined length so working with surface points doesn't work as this would change the shape of the original part. It would be ok to cut the edge if e.g. blend would be part of the solution.

I hope that's a clearer explanation.

S.
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 From:  Michael Gibson
6863.5 In reply to 6863.4 
Hi simba, re:

> so working with surface points doesn't work as this would change the shape of the original part.

The amount of disturbance of the original part can be reduced if you insert additional points into the surface, see the attached 3DM file for an example.





The surface retains the same overall shape, it's only changed in shape in the localized area around the moved control points.

That's probably the easiest way to get the seamless and smooth type qualities that you were asking about originally.

If you want to build something as a separate part you're probably looking at cutting away some holes in between the pieces and doing Blend, but your case here with the very tightly bent shape right in the area you want to blend from will probably make that rather difficult.

- Michael

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