Offset needed, how do I replicate the same fillet and connect it smooth?

Rhino Rhino for Windows
1

Layer original is" “DONJI dio”. Layer “offset” was the first part, and the next 2 layers is where I’m at

I want to make this canal smaller by offsetting it for 5 mm from both sides. Now, my plan was to select this curve, offset it inwards (right) and then sweep along so the radius is the same and constant.

However, I can’t really offset it as you can see. I tried DupEdge - Join - Offset, but this is not the curve I need

As a 2nd option, in layer “offset +5offsrf” i tried offsetting the surface, but i realised I don’t want the surface to go “up”, but only sideways (inwards). So I offsetted only the vertical part without the radius. How do I replicate the radiuses on the new, offsetted part?

hardtopIvo za glodanje.3dm (3.9 MB)

slika
slika1409×761 78.8 KB

2

image
image1562×791 104 KB

hardtopIvo za glodanje DC01.3dm (6.6 MB)

I exploded the object.
Deleted the fillets.
Extended and trimmed the surfaces.
Joined the surfaces.
FilletEdge

3

Thank you for your reply.

I see the way, the problem is, I’m a beginner so I get lost in the “easier” things, i.e. i tried extending the surfaces on your model, but when I extend the first, the second (horizontal) won’t extend for me (picture)

Or perhaps I misunderstood.

If you could post some more screenshots I would be really grateful. If it’s too much for your time I don’t mind paying a beer for it

5

Your surfaces extended for me with no problems after I exploded the object.

ExtendSrf will extend a surface, but not a polysurface. A polysurface is several surfaces joined together.

6

slika
slika972×716 89 KB
When I use ExtendSrf, I can move this edge to the right, but not to the left where I want it. Why is that?

As I said I’m a total beginner so pardon me for these basic questions..

7

Is there a reason you are using the file I uploaded with the surfaces moved instead of your original file?

ExtendSrf on that surface has a problem. I started a thread about it. ExtendSrf not working on trimmed edge

That surface is a trimmed surface. Work around:
DupEdge
Untrim
ExtendSrf
OffsetCrvOnSrf the duplicated edge curve
Trim

In this situation.
Offset the side surface.
Untrim the side surface and ExtendSrf it if needed so that it will project above the top surface.
Untrim the top surface.
ExtendSrf the top surface if needed so it will intersect the side surface.
Trim the intersecting surfaces.

By the way, the tolerance in your file is 0.29449. The tolerance should be between 0.01 and 0.00001

8

Thank you for your help.

I was using your file because if I can achieve the result I want on the little segment you did, I should be able to easily replicate on the whole mode.

At the moment I am still getting “Offset curve on surface failed” and “Failed to extend”.

I’ll experiment some more then come back.

9

@davidcockey David, could you check your DM? I’ve sent you a message. Thank you