Sketch Basics
Sketch your own geometry — dimensions, constraints, and getting every line black — then extrude four tubes as separate bodies.
Key idea
A sketch isn't finished until every line is black.
Blue means it can still move.
01
SKETCHING FROM SCRATCH
In this lesson, you will learn all the basics to sketching and all the tools you will use
- Start a Sketch on a plane and draw a rectangle.
- Dimensions set sizes and distances; constraints set relationships.
- The origin is your anchor — tie geometry back to it.
FUSION 360 · SCREENSHOT
add → course-shots/1a-s1-06/1001.png
FIG 1001
Step 1Now let's learn the basic sketch tools. Start by creating a sketch, found in the solid tab under "Create"
Two Ways to Lock a Sketch
Dimensions
- Set an exact distance or size
- e.g. 4.25 in between rails
- Each one removes a degree of freedom
Constraints
- Define a relationship, no number
- Horizontal, Equal, Symmetric, Coincident
- One constraint often replaces several dimensions
02
EXERCISE: SKETCH A SIDE LAYOUT FOR A DRIVETRAIN
Start a new sketch and create some shapes
- Create a 8x2x1 box tubing
- Create a 2" radius circle and 1/4" thickness
- Lastly, do your best to recreate this skech using the tools we learned about
Recap
SKETCH IT YOURSELF
- Dimensions set size; constraints set relationships
- Black sketch = fully constrained; blue can move
- Fewer dimensions: use Symmetry and Equal
Your Task
Build this
- Model what this lesson covers in Fusion 360.
- Use the AltSkripts tools where they apply.
- Save it with a clear name.
How to submit
- In Fusion: Share → Public Link → Copy.
- Paste the link below.
- A coach reviews it in AltHub.