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3D Gem (hit a wall)


Mathius

So I'm trying to model something close to what is commonly known as an Oval cut gem.  It's not exactly that, it's close.  It basically goes from a 12 sided polygon to an 8 sided polygon core with a few trim pieces.  I'd like the underside to be basically hollow with an 1/8" thickness.

I've got years of paper drafting experience and I've dabbled with 3D programs and taken a few Autocad courses, but I'm new to DesignSpark and I'm trying to work it out with various youtube tutorials.

If I was doing this in a 3D modeling program, I'd lay out the "cuts" of the gem, extrude what I needed and simply move the faces to pull the contours where I want, but DS doesn't work that way.

I started with a circle, divided it into 30 degree increments, connected them to get a 12 sided polygon and started laying out my cuts from there. 

After playing around with the pull command I couldn't get the results I wanted, so I started moving the faces along the z axis and trying the blend command.   This worked great for the inside 8 sided polygon, but when I try to get the outside pieces to chamfer, all DS wants to do is either make a sheer vertical connection, or it won't do much at all. 

When I tried using the move command to raise the lines to meet, hoping it would pull the rest of the lines with the vertex, well, that caused the whole thing to get wonky. 

I have included the basic sketches and some 3d attempts I'm making and I'm hoping someone can give me some suggestions.