SHS3 Design And Communication Technology · Semester 2 Week 13: Mechanical Drawing

Lesson notes

Learning Objectives

Indicator: 3.3.2.LI.3 - Prepare detailed working drawings to scale using appropriate drawing instrument or CAD

By the end of the lesson, learners can:

Define detailed working drawings and distinguish them from assembly drawings prepared in Week 12.
Identify and label the key elements of a detailed working drawing, including dimensions, tolerances, surface finish symbols, title block, and material specification.
Measure an actual machine part or component using callipers and a steel rule to obtain the dimensions needed for a scaled drawing.
Prepare a detailed working drawing of a cylindrical machine part (shaft or pin) to a stated scale using drawing instruments (set-square, compass, dividers).
Produce the same detailed working drawing using basic CAD tools (line, dimension, and text commands) at the same scale, and compare the two results.

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Curriculum details

Strand: Extended Drawing (Strand 3)
Sub-strand: Mechanical Drawing (3.2)
Content standard: 3.3.2.CS.1 - 3.3.2.CS.1 Understand the concept of Mechanical drawing. 3.3.2.LO.1 Apply the concept of assembly and working drawings in applied technology.
Indicator: 3.3.2.LI.3 - Prepare detailed working drawings to scale using appropriate drawing instrument or CAD
Suggested placement: Semester 2, Week 13 (Week 33 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. 102

Exemplars (from the NaCCA curriculum)

Managing talk for learning, Activity-based learning:
1. Use board illustrations, pictures, and charts to engage learners in a whole class discussion to explain detailed working drawing
2. Demonstrate the preparation of detailed working drawing with the use of board illustrations, charts, videos and pictures in a whole class.
3. Prepare detailed working drawings of a given machine part or system to scale using appropriate drawing instruments and CAD.

Assessment (3.3.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.

Teaching and Learning Materials:
- Models
- charts and drawing instruments
- such as set-squares
- protractor
- pair of compasse
- dividers
- reference books
- drawing studio
- access to internet
- LCD Projector.