Lesson Notes By Weeks and Term v5 - Grade 10
Revision and examination preparation (Grade 10 EGD) – Week 7 focus
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Revision and examination preparation (Grade 10 EGD) – Week 7 focus
Download the Lessonotes Mobile South Africa app for faster lesson access on Android and iPhone.
Subject: Engineering Graphics and Design
Class: Grade 10
Term: Term 4
Week: 7
Theme: General lesson support
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This week is crucial for consolidating your understanding of the Grade 10 EGD curriculum. We'll be focusing on revision strategies and practicing examination-style questions. Excelling in EGD opens doors to various career paths, from architecture and engineering to product design and construction. South Africa's infrastructure development heavily relies on skilled individuals who can interpret and create technical drawings. Understanding EGD concepts empowers you to contribute to building a better future for our nation, from designing sustainable housing to developing innovative transportation systems.
This section will cover the main topics from the first two terms, essential for exam success. a)
Orthographic Projection: Orthographic projection is a method of representing a 3D object in 2D by projecting its visible faces onto multiple planes, typically the front (or elevation), top (or plan), and side views. In South Africa, we generally use Third-Angle Projection. This means the view is placed behind the object as you are looking at it. Imagine the object inside a glass box; the orthographic views are what you see "through" the box, drawn onto the sides of the box.
Key Principles: Projection Lines: Perpendicular lines extending from each point on the object to the projection planes.
Line Conventions: Use thick, continuous lines for visible edges, dashed lines for hidden edges, and thin lines for construction and dimensioning.
Arrangement of Views (Third-Angle): The plan view is above the elevation, and the side view (usually left side view) is to the right of the elevation.