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4.1 Orthographic Drawing
Wood Technology · Grade 11 · 14 lessons in the design
What this covers
- Meaning and purpose of orthographic drawing in woodwork
- How a view is formed by orthographic projection
- The three principal views: front elevation, plan and side elevation
- First angle orthographic projection
- Third angle orthographic projection
- The difference between first angle and third angle projection
- Line conventions used in orthographic drawing
- Dimensioning orthographic drawings
- Drawing orthographic views to scale
- Drawing pictorial objects from orthographic views
- Using CAD to draw orthographic projections
- Orthographic drawing as a means of communication
What you will be able to do
- draw views of objects in first and third angle orthographic projection
- draw pictorial objects from orthographic views
- appreciate orthographic drawings as a means of communication
Key questions
“Why is orthographic drawing important in technical drawing?”
Lessons
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What orthographic drawing is
40 min · 1 practice tasks · quizExplain what orthographic drawing is and why it matters in woodwork.
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How a view is formed by projection
40 min · 1 practice tasks · quizExplain how flat views are formed by orthographic projection.
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The three principal views
40 min · 1 practice tasks · quizDescribe the front elevation, the plan and the side elevation.
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First angle orthographic projection
40 min · 1 practice tasks · quizPlace and draw views using first angle projection.
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Third angle orthographic projection
40 min · 1 practice tasks · quizPlace and draw views using third angle projection.
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First angle and third angle compared
40 min · 1 practice tasks · quizCompare the first angle and third angle methods and the projection symbols.
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Line conventions in orthographic drawing
40 min · 1 practice tasks · quizUse the standard types of line correctly in an orthographic drawing.
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Dimensioning orthographic drawings
40 min · 1 practice tasks · quizAdd sizes to an orthographic drawing correctly.
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Drawing orthographic views to scale
40 min · 1 practice tasks · quizChoose and use a scale when drawing orthographic views.
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Sketching orthographic views from a pictorial object
40 min · 1 practice tasks · quizSketch the three views of an object shown as a picture.
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Drawing a block in first angle
40 min · 1 practice tasks · quizDraw a full first angle projection of a simple block.
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Drawing a block in third angle
40 min · 1 practice tasks · quizDraw a full third angle projection of a simple block.
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Drawing pictorial views from orthographic views
40 min · 1 practice tasks · quizBuild a pictorial view from a set of orthographic views.
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Using CAD and communicating with orthographic drawings
40 min · 1 practice tasks · quizExplain how CAD is used to draw orthographic projections and review the node.