Design and Drawing for… · SHS2 Manufacturing Engineering

Lesson notes

Learning Objectives

Indicator: 2.2.1.LI.1 - Outline the importance of sectioning, dimensioning, and tolerance of geometric objects.

By the end of the lesson, learners can:

Define sectioning, dimensioning, and tolerance in the context of technical drawings, and state why each is used in manufacturing.
Explain at least three reasons why sectioning is important when communicating the internal features of a product.
Outline the rules of good dimensioning and apply them to identify correctly and incorrectly dimensioned drawings.
Describe the role of tolerances in manufacturing, including how they allow for acceptable variation in part sizes.
Justify why a product drawing without proper sectioning, dimensioning, or tolerance would lead to manufacturing errors and wasted materials.

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Curriculum details

Strand: Design and Prototyping (Strand 2)
Sub-strand: Design and Drawing for Manufacture (2.1)
Content standard: 2.2.1.CS.3 - Demonstrate that detailed and assembly drawings are significant for product design and manufacturing. 2.2.1.LO.1 Explain the importance of freehand sketch, projection of objects, detailed and assembly drawings in product design and manufacturing.
Indicator: 2.2.1.LI.1 - Outline the importance of sectioning, dimensioning, and tolerance of geometric objects.
Suggested placement: Semester 1, Week 19 (Week 19 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 63

Exemplars (from the NaCCA curriculum)

Collaborative/Research-Based Learning: In mixed-ability group, let learners read on sectioning, dimensioning and tolerance of geometric objects from the library, make presentations of their findings in class and receive feedback. Using sample drawings, lead learners to discuss the importance of sectioning, dimensioning and tolerance of geometric objects.
Teaching and Learning Materials:
- * Textbooks * Library facilities
- * Internet access * ICT equipment
- * Sample assemble drawing * Detailed drawing or charts
Assessment (2.2.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.