2D Exercise 1
- Breno Cruz
- há 12 horas
- 2 min de leitura
This is the single most important concept in Fusion 360. If you master Sketches and Constraints, you master the software. If you ignore constraints, your models will "break" every time you try to change a dimension.
1. The Sketch
Definition: The 2D drawing that forms the foundation of every 3D object. The Golden Rule: Never try to draw perfectly. Draw the shape roughly, then use Constraints to make it perfect.
Blue Lines: The sketch is "Under-Constrained." You can drag lines around, and they will move. This is bad for final engineering.
Black Lines: The sketch is "Fully Constrained." It is locked in place and mathematically defined. This is your goal.
2. Constraints (The "Logic")
Constraints are Geometric Rules. instead of saying "This line is at 90 degrees," you say "This line is Perpendicular to that line." This means if you move one, the other follows automatically.
Here are the essential constraints you must know:
A. Coincident
What it does: Glues two points together.
Use it: To connect the corner of a square to the Origin point (0,0).
B. Horizontal / Vertical
What it does: Forces a line to be perfectly flat or perfectly upright.
Use it: When you drew a rectangle but one side is slightly crooked.
C. Tangent
What it does: Makes a line flow smoothly into a circle without a sharp corner.
Use it: Creating smooth transitions, like a belt on a pulley or a road curve.
D. Equal
What it does: Forces two lines to be the exact same length, or two circles to be the exact same size.
Use it: If you are drawing a square, draw a rectangle and apply "Equal" to the top and side. Now you only need one dimension instead of two.
E. Midpoint
What it does: Locks a point to the exact center of a line.
Use it: To center a triangle on top of a square.
F. Concentric
What it does: Forces two circles (or arcs) to share the exact same center point.
Use it: Making a washer or a pipe (inner circle + outer circle).
All dimensions are in mm/g/s/ISO
2D Sketch
Exercise 1 - 2D 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/Z2C0Oc83VYc