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Oblique and Isometric Drawings

Oblique and Isometric Drawings

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Oblique and Isometric Drawings

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

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

  6. Side by Side Comparison Cavalier Oblique Cabinet Oblique

  7. Which is the cube ?

  8. Were you right?

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

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

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

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

  13. Types of Axonometrics

  14. Orientation of Pictorial Objects

  15. 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

  16. Isometric Circles & Angles

  17. Isometric Ellipses

  18. Using the Ellipse Template

  19. Drawing Rounded Corners

  20. Construction of Cylinders • Lightly block in the cylinder

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

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

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

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