Use surfaces to split bodies and faces

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Use surfaces to split bodies and faces.

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In this video, we'll use split body with a surface and split face with a surface.

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In Fusion 360, we want to carry on with our complex box.

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We're going to start by rolling the end of the features before the shell and we want to expand our Bodies folder and show our surface body.

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Going to rotate it around slightly so we can see all three faces that belong to the surface, navigate to surface tools and select offset.

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We're going to select all three faces of the surface and we're going to bring it down a distance of 30 mm.

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Notice that when we do this, the surface does not extend through the solid body.

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We're going to select OK, navigate back to our solid tools and we want to take a look at two of the split options.

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Split Face and Split Body.

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If we select Split Face first, we need to determine which faces we want to split.

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We want to split all the way around the outside of the part.

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Then we need to rotate it and select every face that we want to split.

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Then we can select our splitting tool.

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To do this, I'm going to navigate back to a home view and I'm going to select Body 3 that's inside of my browser.

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There's an option to extend the splitting tool which will allow us to extend out past that front edge where the surface doesn't intersect.

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We say, OK, note that we still have one solid body but now we've split the solid body on the outside only in the case of its faces.

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I'm going to select and delete the split face and take a look at split bodies.

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For split body instead of selecting individual faces, we’ll have to select a solid body.

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For the splitting tool, once again I'll select the Body 3 surface body and I'll allow it to extend the splitting tool and say OK.

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If we take a look at our browser, we now have Body 1 and Body 4.

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These are two separate solid bodies.

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If I hide my surfaces and I hide Body 1, I’m left simply with this top body.

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Next I want to add a fillet.

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In this case, I'll add a 15 millimeter fillet to the bottom edge and say OK.

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But what happens when we roll back past our shell?

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The shell was applied to the original bottom face of the original body.

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So if we take a look at this and we turn on our analysis,

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we can see what we've created is a solid body on top and a thin wall solid body on the bottom.

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Using split bodies means that the original face that we used for our shell was on the lower portion of the split body.

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So keep in mind when you're using tools like split body and split face and you start to reorganize the timeline,

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make sure you understand the implications of how those tools are going to be rebuilt.

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In the case of using something like a shell, we would want to make sure that we modify the shell feature.

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And instead of selecting the faces or bodies that we want to shell, we would select the entire body from the browser, say, OK.

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And now we've shelled just the inside of that body.

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If we turn off our section analysis, note that none of the external faces are open because we selected the entire body as the shell.

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So if you want to keep that upper body as the shell, you will need to rebuild some of the features in the timeline.

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For us, however, let's go ahead and navigate back to a home view and let's make sure that we save this before moving on.