Work flow for modeling an iron ornament

I’ve worked with Rhino now for a few years starting with version 5. I’ve drawn a lot of things and worked with grasshopper a lot. I’ve not done any modeling. Now I need to learn to model things like the picture in the included Rhino drawing file.
disc-element-2722dec.3dm (985.1 KB)
I have gotten part way on this thing. But I’m not sure I have started in the right way. I am looking for suggestions on work flow and on connecting the multiple surfaces. I’ve done one BlendSrf of one petal to the center. Not sure if this is the best way. The ultimate goal here is to be able to make an object that is water tight (it will be about 3/8" thick maybe) so that it can be 3D printed to create a pattern for casting in aluminum or iron. So ultimately I’ve got to worry about draft and other casting issues. But right now, I’m a beginner and trying to wrap my mind around connecting surfaces in the best way.

You’ll have to extend your surfaces so they intersect… Check out the model below.

If you would model your object on the origin, you would benefit from being able to quickly set the axis for the polar array…

disc-element-2722dec.3dm (1.0 MB)

1 Like

Thanks Martin,
I’ll work with that for a while.

1 Like

I’ve made some progress on my project. I’ve got my surfaces intersecting. I can join the main surfaces of the disc. But I’ve tried various things to get what I call the leaves and ridges to join and cannot. I know I am missing some basic something but can’t see it. Hope you can help.
joes-disc3-0123jan.3dm (1.3 MB)

As long as you don’t want to add any fillets, the surfaces you have work fine.

I moved the main surfaces to the left and joined those. I deleted two of the undersides on the blocks outside of the cylinder and was able to cap the polysurface with the cap command.

The main surfaces are now a closed polysurface and the 12 smaller polysurfaces can be added to it with the boolean union command.

joes-disc3-0123jan.3dm (2.3 MB)

The selected edge segments can be problematic if you want to addd fillets.

If the 12 polysurfaces could be modeled as single surfaces each, you would have less problems.

Thank you Martin. I think I see what you did. I had tried to union the leaves and ridges with the top surface but they wouldn’t go. So the main body had to be a closed polysurface before the boolean union would work?
I do understand the comment about the 12 polysurfaces being modeled as single surfaces. Clearly I have a way to go to learn about constructing surfaces like these. Modeling these things is new to me.

Yes that makes things easier.

It isn’t at simple as it seems…