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Engi 1504 – Graphics

Engi 1504 – Graphics. Lecture 4: More on visualization Review of isometrics Adjacent and similar areas Projection studies and assignment 4. Isometric Example. Isometric Sketching: Steps. Visualize object by breaking into known shapes (circles, prisms, etc)

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Engi 1504 – Graphics

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  1. Engi 1504 – Graphics Lecture 4: More on visualization • Review of isometrics • Adjacent and similar areas • Projection studies and assignment 4

  2. Isometric Example

  3. Isometric Sketching: Steps • Visualize object by breaking into known shapes (circles, prisms, etc) • Define overall size defining width, height and depth • Sketch known shapes • Connect ‘loose ends’ • Darken

  4. Adjacent Areas • Adjacent areas are surfaces that reside next to each other • The boundary between surfaces is represented by a line indicating a change in plane

  5. Many possible solutions Use all views necessary to represent the object clearly • Adjacent areas represent surfaces that are: • At different levels • Inclined or oblique • Cylindrical • A combination of the above

  6. Similar Areas • A surface always appears as either a line or as an area • When a surface appears as an area it may be true size or distorted. • Only angles and lengths of sides are changed, the number of sides and their sequence are unaffected

  7. Similar Areas cont. Rule of configuration: Every plane surface, regardless of shape, always appears either as an edge or as a figure of similar configuration

  8. Similar Areas cont. If a surface shows similar configuration in two views and appears as an edge in the third view: Inclined surface An inclined surface is perpendicular to one of the principal planes of projection and inclined to the others. If a surface shows similar configuration in all views: Oblique surface

  9. Inclined and Oblique Surfaces Inclined (vertical) Inclined Inclined Oblique

  10. Inclined and Oblique Surfaces Based on what we’ve learned, where is the error? Remove corners

  11. Projection Studies

  12. Projection Studies

  13. Finding Missing Information • Today’s assignment is to complete the views of an object that are missing some information. • Let’s looks at Example 2.8 in the text.

  14. Finding Missing Information • Given that the front view is incomplete and the side view is complete, draw the top view, complete the front view, and sketch the isometric

  15. Finding Missing Information • Front view: there is no line corresponding to the bottom of the slot

  16. Finding Missing Information • Top view: project the width, depth and slot points

  17. Finding Missing Information • Darken lines and complete the sketch

  18. Class Assignment 4 • Sketch the missing view (or missing lines) and an isometric for Questions 104 and 106 in workbook. • Notes: • the missing views must be completed using your drawing instruments • the isometric must be done freehand

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