SHS2 Design And Communication Technology · Semester 2 Week 12: Mechanical Drawing

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.2 - Draw the sectional views of machine parts and components using drawing instruments

By the end of the lesson, learners can:

Identify the correct cutting plane line placement for various machine parts based on the principles of sectioning studied in Week 11.
Draw a full sectional view of a simple machine component (such as a bush or pulley) using drawing instruments with correct hatching.
Draw a half sectional view of a symmetrical machine part, correctly showing both the external and internal features in the appropriate halves.
Apply the correct hatching technique, including spacing, angle, and direction, to distinguish cut surfaces from uncut surfaces in their drawings.
Assess their own and peers’ sectional drawings against a checklist of standard sectioning conventions, identifying at least two corrections needed.

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Curriculum details

Strand: Extended Drawing (Strand 3)
Sub-strand: Mechanical Drawing (3.2)
Content standard: 2.3.2.CS.1 - 2.3.2.CS.1 Understand the concept of building drawing. 2.3.2.LO.1 Make accurate sectional drawings of machine parts or components, adhering to the principles of sectioning in engineering. 2.3.2.LO.2 Use your understanding on the principles of electrical circuit and circuit diagrams to explain electrical circuit and circuit diagrams,
Indicator: 2.3.2.LI.2 - Draw the sectional views of machine parts and components using drawing instruments
Suggested placement: Semester 2, Week 12 (Week 32 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. 74

Exemplars (from the NaCCA curriculum)

Activity-based learning, Experiential learning: Help learners to use drawing instruments to draw the sections of some parts of a machine such as a bolt, nut, thread, full, half, broken out, offset sections, etc.

Assessment (2.3.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.

Teaching and Learning Materials:
- Models
- Charts
- Reference books
- Drawing studio
- Drawing instruments
- Access to internet
- LCD Projector