topic Betreff: Surface modeling geometry issues in Fusion Design, Validate & Document Forum

Surface modeling geometry issues

Anonymous — Wed, 09 Jun 2021 20:08:29 GMT

Hello,

I am trying to model a solid body using surface modeling tools. I have gotten pritty far but I cannot seem to create the surfaces on the sides of my model that would complete the solid body.

The closest I have gotten is, "surface patch as bounded" with all three edges selected and it presents as a good surface and then when I click ok, it creates some wild geo.

I have tried everything I can think of but fusion just seems to create weird geometry no matter how I set up the patch.

I would love some help with how I can complete my body.

I have provided the fusion file

Thanks,

Betreff: Surface modeling geometry issues

mango.freund — Wed, 09 Jun 2021 22:22:58 GMT

Hello @Anonymous -- voila ça va -- mango

Betreff: Surface modeling geometry issues

Anonymous — Thu, 10 Jun 2021 20:54:38 GMT

Thank you for your reply.

Betreff: Surface modeling geometry issues

TrippyLighting — Thu, 10 Jun 2021 21:20:52 GMT

Your loft profile sketches are not properly constrained and not dimensioned. The lack of tangency constraints will make it difficult to achieve good surfaces. I'd work on that before attempting to loft and patch.

@mango.freund did you check the surfaces after patching ?

They are concave and I believe that is not desirable in this case.

Betreff: Surface modeling geometry issues

mango.freund — Fri, 11 Jun 2021 04:01:02 GMT

hallo @TrippyLighting -- Of course you are right and I also know how to help myself, but there was no question about it. besides what I believe and what I know you have to tell apart. it may just as well be that convex is false. you show me a weakness - I appreciate that. too often I don't pay attention to such important questions - thank you.

https://www.youtube.com/watch?v=XvXU0UBtSRQ lg mango

Betreff: Surface modeling geometry issues

TrippyLighting — Fri, 11 Jun 2021 09:33:35 GMT

Thanks for linking to that video.

The author misses to explain some fundamental concepts and also never uses the available tools to check his surface quality. The case presented in the video is much simple than the one presented by the OP.

1. All the diameters are the same.

2. The ends are cylindrical, so the loft "flows" into them tangentially.

Re: Surface modeling geometry issues

rushabhthakkar_910 — Fri, 11 Jun 2021 17:30:19 GMT

https://youtu.be/NypRE2aFhh4 ; https://youtu.be/HmgwKewMcw8 ; https://www.autodesk.com/products/fusion-360/blog/our-top-5-surfacing-tips-and-tricks-for-class-a-geometry/ ; Might Help you..

Re: Surface modeling geometry issues

TrippyLighting — Fri, 11 Jun 2021 19:35:56 GMT

And another misleading blog post that mentions Class A surfacing abilities in conjunction with Fusion 360.

Betreff: Surface modeling geometry issues

Anonymous — Fri, 11 Jun 2021 19:37:14 GMT

Hey, Yes thank you I did notice the surface inconsistency in the solution above. Obviously this solution will not work for me, I have had to adjust the design a little. I was able to get a good surface by adjusting the two smaller diameters to be the same creating a 3 point plane. The surface was able to solve once I did this.

Re: Surface modeling geometry issues

Anonymous — Fri, 11 Jun 2021 19:41:57 GMT

Thank you, but this video presents no real solution to my issue. I watched this video when I was learning the basics, this video is very helpful for that, but is not as helpful in more advanced scenarios.

Betreff: Surface modeling geometry issues

Anonymous — Fri, 11 Jun 2021 19:46:58 GMT

Thank you for posting this video. It is actually a very interesting technique even though it does not solve my issue completely because as Trippy Lightning points out all the diameters in my design are different. however I was able to adjust my design so that two diameters are the same and one is larger this allowed my surface to solve without any inconstancy.

Re: Surface modeling geometry issues

TrippyLighting — Fri, 11 Jun 2021 19:47:51 GMT

@Anonymous can you post your model in its current state?