Fusion Tutorial 1c: Design of an Electronic Box, Continued

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Introduction

This tutorial is the third in a series teaching basic Fusion CAD sketching and modeling tools.

In the previous tutorial, we took the design a simple hollow box and added mounting features to it, using some parametric design tools available in Fusion. In this tutorial we will continue to add the features that will give the box its function: A sample electronics enclosure that could be made on a 3D printer.

In this tutorial we will add some more mounting features for attaching a lid to the box, and for mounting a circuit board inside the box. For the most part the tools used will be the same as those used in the previous tutorial, except we will introduce cutting of the solid using the () "Extrude" tool, as well as copying and pasting sketch features in multiple places.

This tutorial is paced somewhat faster than the previous ones because it is assumed you've had some practice with the sketching and modeling tools in Fusion.

Sketch Mounting Lugs for a Lid

Lugs to hold a lid onto the top of the box are flush with the upper edge of the box. To draw on that plane, select the flat narrow upper surface of the edge of the box.

Select the () "Corner Rectangle" tool. If you hover the cursor over the inside edge of the box, the cursor should "snap" onto the edge. Click and drag the cursor from one edge around the corner to the adjacent edge. Make sure the endpoints are both attached to the edges, as indicated by large black dots. Don't worry about the actual dimensions at this point.

Select the () "Sketch Dimension" tool from the "Create" menu. Set ONE dimension of one of the rectangles to 3/8" (0.375"). Select the () "Equal" tool and set the lengths of the other seven external rectangle edges to the same value. You will need to pick line segments in pairs, rather than selecting all of the segments at once. The edges to set are the ones that are collinear with the four edges of the box inner wall.

Select the () "Fillet" tool from the "Modify" group and fillet all four inside corners to a radius of 0.15". If you are unclear how to sketch these fillets, please refer to the earlier tutorial.