1. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Get out your notebooks.
2.1 Oblique Pictorials
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2. Learning Objectives Review Line Conventions and Isometric Drawings.
You will be able to understand the differences between Isometric, Oblique and Perspective drawings
You will understand the differences between Cavalier and Cabinet oblique drawings.
You will be able to create oblique drawings.

3. Review: Line Conventions Matching
Number 1-9 in your notebook
Construction Line
Hidden Line
Object Line
Dimension Line
Center Line
Section Line
Short Break Line
Extension Line
Long Break Line
Typically represented as a jagged cut or break
Defines the center of arcs, circles and symmetrical parts.
Lightly drawn lines to guide drawing other lines and shapes.
Show interior detail not visible from the outside of the part.
Define where material is cut away.
Shows distance
Freehand line drawn to show where a part is broken to reveal detail.
Thick, dark and defines the item.
Shows where dimension starts and stops.

4. Order the following lines by Precedence
Hidden Lines
Object Lines
Center Lines
Cutting Plane Lines

5. Isometric and Oblique Pictorials
Pictorial Drawing
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
2D illustration of a 3D object
Shows three faces of an object in one view
Provides a realistic view of an object
Three types
Isometric
Oblique
Perspective
Isometric
Oblique (Cavalier)
Oblique (Cabinet)
Perspective
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6. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Isometric
An Oblique pictorial starts with a straight-on view of one of the object’s faces, which is often the front face
Angled, parallel lines are drawn to one side to represent the object’s depth. Common oblique angles include 30°, 45°, and 60°
Oblique
You may choose to use an oblique representation for design ideas in IED. And, you should be able to identify the two different oblique views – cavalier and cabinet.
45°
Project Lead The Way, Inc.
Copyright 2012

7. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Two common types of oblique pictorials:
Cavalier
Cabinet
The difference between the two is how the depth of the object is represented
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012 7

8. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
More realistic view because depth does not appear distorted
Object appears deeper than it actually is
A cavalier oblique [click] represents the object with full depth [click]. This tends to create the illusion that the object is deeper than it actually is. [click]
A cabinet oblique [click] represents the object with half depth [click]. The cabinet oblique, although actually drawn to half depth provides a more realistic view. [click]
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

9. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Follow along with your worksheet.
The following slides show the steps in creating oblique pictorials of the puzzle piece shown below.
Imagine a glass box that encloses the entire object.
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10. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
BOX
Front
Depth
OUTSIDE
Construction
Object
INSIDE
SHADE
Oblique Pictorials
BOX:
Front.
Overall Height
Overall Height
Overall Width
Overall Width
Project Lead The Way, Inc.
Copyright 2012

11. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Overall Depth
1. BOX:
Depth: Complete “the box” by sketching depth lines to the overall depth of the object at a given angle (45 degrees here).
Cabinet is drawn half depth
Cavalier is drawn full depth
For the same object, the “front” (straight on) face is drawn the same for the cavalier and the cabinet oblique views.
For a cavalier oblique, the depth of the object is drawn to full scale.
For the cabinet oblique, the depth is drawn to a length of half of the actual depth measurement.
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

12. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Outside:
Sketch points and construction lines to identify the edges of the object faces that occur on the visible surfaces of “the box”.
Cabinet is half depth
Cavalier is full depth
[Note the shading on the photographic image that is replicated in the sketch.]
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

13. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Outside:
Sketch points and construction lines to identify the edges of the object faces that occur on the visible surfaces of “the box”.
Cabinet is half depth
Cavalier is full depth
[Note the shading on the photographic image that is replicated in the sketch.]
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

14. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Outside:
Sketch points and construction lines to identify the edges of the object faces that occur on the visible surfaces of “the box”.
Cabinet is half depth
Cavalier is full depth
[Note the shading on the photographic image that is replicated in the sketch.]
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

15. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Outside
Object Lines
Use object lines to trace over the construction lines to delineate the edges of the object faces that occur on the visible surfaces of “the box”.
Cabinet is half depth
Cavalier is full depth
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

16. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Inside:
Construction Lines
Sketch additional construction lines to identify edges of the object inside of the box.
Cabinet is half depth
Cavalier is full depth
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

17. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Inside:
Object Lines
Trace over construction lines with object lines to delineate the remaining object lines.
Cabinet is half depth
Cavalier is full depth
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

18. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Create the Oblique Cabinet view.
Cabinet is half depth
Cavalier is full depth
Now, you create the cabinet oblique sketch of the puzzle piece.
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

19. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
4 Shading: You may use tonal shading to enhance the appearance of the perspective sketch and create a more realistic representation.
Cabinet is half depth
Cavalier is full depth
Cavalier Oblique
Cabinet Oblique
Project Lead The Way, Inc.
Copyright 2012

20. Summary: Oblique Construction
BOX
Front
Depth
OUTSIDE
Construction
Object
INSIDE
SHADE

21. Isometric and Oblique Pictorials
Introduction to Engineering Design
Unit 2 – Technical Sketching and Drawing
Oblique Pictorials
Examples
Interlocking pavement concept
Game system controller
Project Lead The Way, Inc.
Copyright 2012

22. Exercises
Complete the 2.1 Oblique Sketching Practice Worksheet