Lesson Overview

Students are introduced to Computer-Aided Design (CAD) using Onshape. They learn what CAD is, why it is used for accurate 2D and 3D design, and how to begin modelling with sketches, planes, revolve, loft, pattern tools, image import and export for 3D printing. This lesson builds foundational digital fabrication skills aligned with the Singapore Design & Technology syllabus.

Learning Objectives

By the end of this lesson, students will be able to:

1
Explain what CAD is and describe why it enables precise design and faster iteration
2
Navigate the Onshape workspace, create a document, and check units before modelling
3
Create sketches on the top, front and right planes
4
Use the Revolve feature to create cylindrical or rotational forms
5
Use Loft to transition between sketches on multiple planes
6
Apply circular or linear sketch patterns to repeat geometry
7
Import an image as a tracing reference and export a part as STL for 3D printing

Singapore Curriculum Alignment

Aligned to MOE Design & Technology: visualisation, modelling and communicating design ideas. Supports the Applied Learning Programme (ALP): computational thinking, design iteration and digital fabrication awareness.

Prior Knowledge Required

Basic computer literacy (login, mouse / trackpad use, file naming)
Recognition of simple geometric shapes and measurements
No prior CAD experience required

Materials & Resources

Item	Quantity
Laptop or desktop computer with internet access	1 per student or pair
Onshape account (student login ready before class)	1 per student
Mouse (recommended for easier navigation)	1 per student
Teacher demonstration screen / projector	1
Hand sketch or reference image for image-import task	1 per student

Safety Notes

Maintain good posture and hand position during extended computer use
Use device chargers and cables safely and keep walkways clear
Save work regularly and use clear file names to prevent accidental loss of progress