Basic CAD Modelling (Onshape)

Lesson Overview

Students build a functional small box with a fitted lid in Onshape. The lesson develops confidence with sketching, extrusion, shell, project, mirror, remove, offset, new part creation, slots, wrap, and export. Students are also introduced to the idea of print-in-place.

Learning Objectives

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

• 1
  Create a simple box body using sketch, extrude and shell operations
• 2
  Use Project to reference existing geometry in a new sketch
• 3
  Use mirror and construction geometry to create symmetrical sketch features
• 4
  Create a lid as a new part using offset and extrude
• 5
  Create a slot or opening feature on a part
• 6
  Export multiple parts for 3D printing
• 7
  Describe what a print-in-place model is and why clearances matter

Singapore Curriculum Alignment

MOE Design & Technology: using CAD to model functional forms and make design decisions. ALP / maker learning: connecting digital models to fabrication.

Prior Knowledge Required

• Completion of introductory CAD lesson or equivalent familiarity with sketching and sketch planes
• Basic understanding of dimensions, symmetry and closed profiles

Materials & Resources