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Pictorial Drawings

GMED UNIT 1. Pictorial Drawings. Pictorial Drawings. 15-1 Pictorial Drawings. Types of pictorial drawings Types of axonometric drawings Isometric drawings. PhotoDisk. Types of pictorial drawings:. Axonometric projection. Types of pictorial drawings:. Oblique projection.

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Pictorial Drawings

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  1. GMED UNIT 1 Pictorial Drawings

  2. Pictorial Drawings

  3. 15-1 Pictorial Drawings Types of pictorial drawings Types of axonometric drawings Isometric drawings PhotoDisk

  4. Types of pictorial drawings: • Axonometric projection

  5. Types of pictorial drawings: • Oblique projection

  6. Types of pictorial drawings: • Perspective

  7. Definition: Axonometric projection • A projected view in which the lines of sight are perpendicular to the plane of projection, but in which the three faces of a rectangular object are all inclined to the plane of projection. PhotoDisk

  8. Types of axonometric projection: • Isometric • The three principal faces and axes are equally inclined to the plane of projection • Dimetric • Two of the principal faces and axes are equally inclined to the plane of projection • Trimetric • All three faces and axes make different angles with the plane of projection

  9. SHAPE DESCRIPTION The AXONOMETRIC projection is a three dimensional representation in which the lines of sight are perpendicular to the plane of projection. ISOMETRIC DIMETRIC TRIMETRIC

  10. Isometric drawings • The object is revolved 45 to the horizontal. • The object is tipped up or down 3516’. • Lines are drawn to true length.

  11. 30° 30° 30° ISOMETRIC PROJECTION True measurements are made along three major axes, which are: • VERTICAL • 30 degrees up to the LEFT • 30 degrees up to the RIGHT Drawing object to actual measurement

  12. ISOMETRIC PROJECTION The basic procedure used in drawing isometrics is to use an isometric grid. Next, draw all lines along the three major axes.

  13. ISOMETRIC PROJECTION When sketching, use isometric grid paper as a guide.

  14. 15-2 Curved Surfaces in Isometric Circles and arcs in isometric drawings Irregular curves PhotoDisk

  15. A circle drawn in isometric • has the shape of an ellipse on any of the three faces.

  16. ? Quick Quiz • Isometric, dimetric, and trimetric are types of what kind of pictorial drawing? • Axonometric projection

  17. 15-3 Common Features in Isometric Isometric sectioning Drawing conventions: Fillets, rounds, and threads PhotoDisk

  18. Sections in isometric • The section is taken on an isometric plane. • In full section, construction lines represent the part cut away.

  19. 15-4 Oblique Projection Types of oblique projection Drawing objects in oblique projection Inclined surfaces

  20. Oblique projection drawings • The object is placed with one face parallel to the frontal plane. • The other two faces are placed on oblique (receding) planes at a convenient angle. • The three axes are vertical, horizontal, and receding.

  21. Types of oblique projection • Cavalier oblique • All lines a drawn in their true length. • Cabinet oblique • Lines on the receding axis are shortened by one-half.

  22. 15-5 Common Features in Oblique Circles and arcs Sections in oblique Drawing conventions Lawrence Lawry

  23. Circles in oblique projection • When possible, the face having circles or arcs should be selected for the front face.

  24. Methods for drawing circles or arcs on an oblique face: • The offset measurement method • The four-center method • In CAD:Use the ellipse command, specifying degree of exposure.

  25. ? Quick Quiz • What are the two types of oblique projection? • Cavalier and cabinet

  26. 15-6 Parallel, or One-Point, Perspective Perspective projection Types of perspective drawings Perspective drawing and sketching PhotoDisk

  27. Definitions: • Picture plane: The plane of projection • Station point: The position of the observer’s eye

  28. Definitions: • Horizon: An imaginary horizontal line taken at eye level • Vanishing point: A point on the horizon where receding lines converge

  29. Types of perspective drawings • Parallel • One vanishing point

  30. Types of perspective drawings • Angular • Two vanishing points

  31. Types of perspective drawings • Oblique • Three vanishing points

  32. VP SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 1. PARALLEL Vanishes to one point

  33. SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 2. ANGULAR Vanishes to one point Vanishes to one point

  34. SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 3. OBLIQUE Vanishes to one point Vanishes to one point Vanishes to one point

  35. 15-7 Angular, or Two-Point, Perspective Angular perspective drawing and sketching Angular perspective in CAD

  36. Grids for angular perspective sketching • Interior • Bird’s-eye view • Exterior • Worm’s-eye view

  37. 15-8 Solid Modeling Types of solid modeling Image generation Data extraction Jonnie Miles

  38. Types of solid modeling: • Wire-frame models • Surface models • Solid models

  39. Types of solid models • Constructive Solid Geometry (CSG)(15-8-7 to come)Combines shapes using Boolean operations (union, subtraction, and intersection) • Boundary Representation (BREP) • Joins surfaces using extrusion or by revolution

  40. ? Quick Quiz • What kind of perspective drawing has two vanishing points? • Angular perspective

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