SHS1 Manufacturing Engineering · Semester 2 Week 3: Manufacturing tools and equipment

Lesson notes

Learning Objectives

Indicator: 1.3.1.LI.1 - Set the datum for a work piece and select coordinates systems for dimensioning an object.

By the end of the lesson, learners can:

Define a datum and identify the three types of datum (point, centre line, and edge) used in marking out a work piece.
Explain the three coordinate systems (cartesian, rectangular, and polar) and describe how each is used to dimension an object.
Set a datum on a given work piece and use it to mark out a rectangular shape on cardboard.
Convert a simple dimension given in one coordinate system to another system, for example, expressing a point located by cartesian coordinates as a polar coordinate.
Justify the choice of a particular datum and coordinate system for dimensioning a given component, based on its shape and manufacturing requirements.

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Curriculum details

Strand: Manufacturing tools, equipment and processes (Strand 3)
Sub-strand: Manufacturing tools and equipment (3.1)
Content standard: 1.3.1.CS.1 - Demonstrate knowledge and understanding of marking out and measurement. 1.3.1.LO.1 Apply the principles of marking out, measurement and gauging; and accurately use industry standards in manufacturing a product.
Indicator: 1.3.1.LI.1 - Set the datum for a work piece and select coordinates systems for dimensioning an object.
Suggested placement: Semester 2, Week 3 (Week 23 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. 40

Exemplars (from the NaCCA curriculum)

Talk for Learning: Discuss with learners the dimensioning of an object using cartesian, rectangular, and polar coordinate systems. Learners, in their mixed-ability groups, use the three types of a datum to mark out a rectangular shape on a cardboard.
Project-Based Learning:
- Learners in mixed-ability groups mark out and cut a rectangular shape of any dimension from a cardboard using a point, centre line, or edge as the datum.
- Learners in think-pair-share use the cartesian, rectangular, and polar coordinate systems to dimension a rectangular metal component, discuss their results with colleagues, and receive feedback. Encourage learners to accept and respect contributions from peers.
Teaching and Learning Materials:
- Cardboard
- Rectangular metal components
- Wooden or metal work piece
- Marking out tools
Assessment (1.3.1.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding.