1. Oblique and Isometric Drawings
GSMST

2. Review Learning Objectives
Sketch pictorials of an object (either oblique or isometric) given orthographic views of the object
Select the best orientation of an object shown in pictorial
Define what makes a drawing a: cavalier oblique, cabinet oblique, isometric, axonometric, perspective, or orthographic views

3. Pictorial
A three dimensional pictorial is a drawing that shows an object’s three principal planes, much as they would be captured by a camera
Sometimes they are called Technical Illustrations

4. Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics
Others
Perspectives

5. Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics
Others
Perspectives

6. Types Obliques Axonometrics Perspectives Cavalier Cabinet Isometrics
Others
Perspectives

7. Cavalier Oblique Front view true size
Receding Axis Angle (Normally 30°, 45° or 60°) is Variable
Depth dimension (receding axis) true size

8. Cabinet Oblique Front view true size
Receding Axis Angle (Normally 30°, 45° or 60°) is Variable
Depth dimension (receding axis) half size

9. Side by Side Comparison
Cavalier Oblique
Cabinet Oblique

10. Which is the cube ?

11. Were you right?

12. Angles in Oblique Angles in front view are drawn true size
Other angles must be located using coordinates
Appearance of angles may be distorted

13. Circles in Oblique Drawn true size in front view
Drawn as ellipses on receding planes
Layout using a Rhombus

14. Cylinders in Oblique Front and Back surfaces are circular
“Sides” are drawn as lines tangent to the front and back

15. Exercise
Sketch an Oblique of a “classical” tombstone. Add a bullet hole through the stone.

16. Types of Axonometrics

17. Orientation of Pictorial Objects

18. Isometrics Axes equally separated (120°)
H, W, and D measurements are true size along iso. axes
Angles must be located by coordinates
Circles appear as ellipses on all surfaces

19. Isometric Circles & Angles

20. Isometric Ellipses

21. The Isometric Ellipse Template

22. Using the Ellipse Template

23. Drawing Rounded Corners

24. Construction of Cylinders
Lightly block in the cylinder

25. Construction of Cylinders
Lightly block in the cylinder
Sketch the upper and lower ellipses

26. Construction of Cylinders
Lightly block in the cylinder
Sketch the upper and lower ellipses
Connect the ellipses with Tangent lines

27. Construction of Cylinders
Lightly block in the cylinder
Sketch the upper and lower ellipses
Connect the ellipses with Tangent lines
Darken the lines

28. Practice Exercise
Complete the orthographic views shown and Sketch an isometric of the part.