# pictorial drawings gmed unit 1. pictorial drawings

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- Slide 1
- Pictorial Drawings GMED UNIT 1
- Slide 2
- Pictorial Drawings
- Slide 3
- 15-1 Pictorial Drawings Types of pictorial drawings Types of axonometric drawings Isometric drawings PhotoDisk
- Slide 4
- Types of pictorial drawings: Axonometric projection
- Slide 5
- Types of pictorial drawings: Oblique projection
- Slide 6
- Types of pictorial drawings: Perspective
- Slide 7
- 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. Definition: Axonometric projection PhotoDisk
- Slide 8
- Types of axonometric projection: Isometric The three 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 Dimetric Two of the principal faces and axes are equally inclined to the plane of projection
- Slide 9
- SHAPE DESCRIPTION The AXONOMETRIC projection is a three dimensional representation in which the lines of sight are perpendicular to the plane of projection. ISOMETRICDIMETRICTRIMETRIC
- Slide 10
- Isometric drawings The object is revolved 45 to the horizontal. Lines are drawn to true length. The object is tipped up or down 35 16.
- Slide 11
- ISOMETRIC PROJECTION True measurements are made along three major axes, which are: VERTICAL 30 degrees up to the RIGHT 30 degrees up to the LEFT Drawing object to actual measurement 30
- Slide 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.
- Slide 13
- ISOMETRIC PROJECTION When sketching, use isometric grid paper as a guide.
- Slide 14
- 15-2 Curved Surfaces in Isometric Circles and arcs in isometric drawings Irregular curves PhotoDisk
- Slide 15
- A circle drawn in isometric has the shape of an ellipse on any of the three faces.
- Slide 16
- Quick Quiz Isometric, dimetric, and trimetric are types of what kind of pictorial drawing? Axonometric projection
- Slide 17
- 15-3 Common Features in Isometric Isometric sectioning Drawing conventions: Fillets, rounds, and threads PhotoDisk
- Slide 18
- Sections in isometric The section is taken on an isometric plane. In full section, construction lines represent the part cut away.
- Slide 19
- 15-4 Oblique Projection Types of oblique projection Drawing objects in oblique projection Inclined surfaces
- Slide 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.
- Slide 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.
- Slide 22
- 15-5 Common Features in Oblique Circles and arcs Sections in oblique Drawing conventions Lawrence Lawry
- Slide 23
- Circles in oblique projection When possible, the face having circles or arcs should be selected for the front face.
- Slide 24
- Methods for drawing circles or arcs on an oblique face: The offset measurement method In CAD: Use the ellipse command, specifying degree of exposure. The four-center method
- Slide 25
- Quick Quiz What are the two types of oblique projection? Cavalier and cabinet
- Slide 26
- 15-6 Parallel, or One-Point, Perspective Perspective projection Types of perspective drawings Perspective drawing and sketching PhotoDisk
- Slide 27
- Definitions: Picture plane: The plane of projection Station point: The position of the observers eye
- Slide 28
- Definitions: Horizon: An imaginary horizontal line taken at eye level Vanishing point: A point on the horizon where receding lines converge
- Slide 29
- Types of perspective drawings Parallel One vanishing point
- Slide 30
- Types of perspective drawings Angular Two vanishing points
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- Types of perspective drawings Oblique Three vanishing points
- Slide 32
- SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 1. PARALLEL Vanishes to one point VP
- Slide 33
- SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 2. ANGULAR Vanishes to one point
- Slide 34
- SHAPE DESCRIPTION There are three types of PERSPECTIVE projections: 3. OBLIQUE Vanishes to one point
- Slide 35
- 15-7 Angular, or Two-Point, Perspective Angular perspective drawing and sketching Angular perspective in CAD
- Slide 36
- Grids for angular perspective sketching Exterior Worms-eye view Birds-eye view Interior
- Slide 37
- 15-8 Solid Modeling Types of solid modeling Image generation Data extraction Jonnie Miles
- Slide 38
- Types of solid modeling: Wire-frame models Solid models Surface models
- Slide 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
- Slide 40
- Quick Quiz What kind of perspective drawing has two vanishing points? Angular perspective

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