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Technical DrawingVisual Communication of Technical Information
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Technical DrawingVisual Communication of Technical Information
Unit Overview – 5 to 10 classes Precise Drawings Give More
Information Types of Technical Drawing
Isometric Projections Parallel, Perspective, and Oblique Orthographic Projections
Multi-view Sketches Practice
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Tech Drawing -- Overview
Good drawings convey detailed information about solutions to technical problems. In this unit you will learn:
Technical Drawing (focus of two types)
Puzzle cube design and fabrication Orthographic and Isometric Layouts
Manufacturing diagrams
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How can we present an object and learn the most about it?
This view shows a square object with a number and some other detail
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This view shows two sides and more information. Note: All vertical lines are parallel
Isometric Projection
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This view shows three sides and even more information. All vertical lines are parallel; all other lines are 30 to 60 degrees above the horizon.
Isometric Projection
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A see-through version lets us infer information about the hidden sides
Isometric Projection
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Oblique Projection
The front is drawn on the X and Y axes. The side and top are drawn at an oblique (not square) angle in the Z direction. A lot of information is shown regarding the front; less about the top and side.
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Parallel Projection
Parallel lines remain parallel regardless of how they really appear
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Perspective Projection
Parallel lines meet in the distance as they really appear
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Perspective and Parallel
The cube is scaled to be 12 ft.
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How can we make a standard drawing of this object?
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To begin:
Horizon
All vertical lines are perpendicular to the horizon
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Next:
Horizon
All other lines rise at 30 degrees from the horizon
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Continue:
Horizon
All lines that complete the diagram are parallel to one of the three main lines
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Complete:
Horizon
The final isometric drawing presents three sides and infers information about the other sides
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Practice
Take a few minutes to copy EACH of these isometric figures in your notebook or on plain paper
1.
2.
Start with each of the three isometric axes
Add vertical lines from the corners. They should be parallel to the center line
Height
WidthDepth
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Practice
Take a few minutes to copy EACH of these isometric figures on a practice sheet
3.
4.Erase where you need to
Add lines for width parallel to the width axis
Finish the cube with lines for depth parallel to the depth axis
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Practice
Draw an isometric sketch of the boxes in the front of the room
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This is Isometric Paper
Horizon
To make drawing easierUse isometric paper
Graph paper with linesThat follow isometric60-degree axes
Use this to practice Drawing isometricfigures
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More Practice
There are seven 3-D figures made of cubes on your work sheet.
Construct each using plastic cubes.
`
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More Practice
Then draw each on isometric paper.
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A standard method of 3-dimentional (3D) drawing that shows the most detail about three adjacent sides of an object.
Isometric Projection