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Oblique and Isometric Drawings

Oblique and Isometric Drawings. GSMST. 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

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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.

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