3D Exercise 76
- Breno Cruz
- Dec 26, 2025
- 2 min read
In this CAD tutorial we'll use the features:
1. Extrude
Definition: The primary tool for turning a 2D sketch into a 3D solid. How it works: You select a closed sketch profile and pull it. Best for: Creating the main "Master Block" of your design before you start carving it out.
2. Shell
Definition: Hollows out a solid body. How it works: You select a solid block and select the top face to "remove." Fusion leaves you with thin, uniform walls (e.g., 2mm thick). Best for: Instantly turning your Extruded block into a container or housing.
3. Rib
Definition: Creates thin support walls (webs) to strengthen a part. How it works:
The Problem: Drawing a sketch for a support triangle, extruding it, and trying to get it to touch a curved wall perfectly is difficult.
The Solution: With Rib, you just draw a single line. The tool extends that line sideways to create thickness and downwards until it hits the floor and walls, filling the gap perfectly. Best for: Strengthening tall standing features (like screw posts) so they don't snap off.
4. Hole
Definition: A smart tool for creating standard drill holes. How it works: Instead of sketching a circle and cutting it, you click a point and select "M4 Screw." Fusion automatically sizes the hole and creates the recess for the screw head (counterbore) if you want it. Best for: Creating the mounting points inside your screw posts.
5. Mirror
Definition: Creates a symmetrical copy. How it works: You model one detailed screw post with its Rib and Hole on the left side. Then, you use Mirror to copy those three features to the right side. Best for: Saving time. Never model the same screw boss twice!
6. Combine
Definition: Performs Boolean operations (Join, Cut, Intersect). How it works:
Join: If you modeled a separate handle or foot, use Combine to fuse it to the main box.
Cut: If you have a "Lid" body and a "Box" body, you can use the Box to cut a lip into the Lid so they fit together. Best for: Merging separate bodies into a single manufacturable part.
7. Fillet
Definition: Rounds off sharp edges. How it works: Applies a radius to edges. Best for: Applied last to smooth out the Ribs and the outer edges of the box.
All dimensions are in mm/g/s/ISO
3D Sketch
Exercise 76 - 3D practice drawing for all CAD software ( AutoCAD, SolidWorks, 3DS Max, Autodesk Inventor, Fusion 360, CATIA, Creo Parametric, SolidEdge etc.)
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Tutorial In Autodesk Fusion: https://youtu.be/EswUY6bAjow