![]() ![]() Yet, just this week I opened a model and somehow all references were lost. I’m going to pretend for a moment I haven’t spent 20+ years making sure my assemblies properly reference my parts. ![]() Now, let’s break these down and see how Fusion 360 approaches it differently. You know, in contrast to bottom-up modeling: Creating parts and adding them to an assembly. Here’s my definition of top-down design: Creating parts in context of an assembly. A smarty-pants, scholarly person on Wikipedia described top-down design as “breaking down of a system to gain insight into its compositional sub-systems in a reverse engineering fashion.” What-evs. I’ll cover that feature here in a moment, but it will make more sense if we have a better understanding of top-down design (or layout, skeleton, or multi-body modeling). In our first article, I mentioned five features in Fusion 360 and one of those features was As-Built Joints. Sound familiar at all? Well, this is where Fusion 360 approaches assemblies a little differently. I faced this frustration many times when just wanting to model up an idea–thinking about assembly structure when I just wanted to think about assembly design. But even before that, you consider how to build and organize the parts and assemblies? Bottom-up? Top-down? Sketch-driven? Parametric modeling is great for many, but not so friendly for conceptual modeling. If you’re a SolidWorks or Solid Edge user, you’re comfortable with building assemblies by mating components together. “Where we’re going, we don’t need mates.” ![]()
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