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PROJECTIONS

PROJECTIONS. 11.2. DEF: a projection is a representation of a three-dimensional shape on a two-dimensional surface. PROJECTIONS. PROJECTIONS. Projections are arranged into 3 categories: multi-view Isometric oblique. An example of an isometric projection. DRAWING TERMINOLOGY.

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PROJECTIONS

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  1. PROJECTIONS 11.2

  2. DEF: a projection is a representation of a three-dimensional shape on a two-dimensional surface. PROJECTIONS

  3. PROJECTIONS Projections are arranged into 3 categories: multi-view Isometric oblique An example of an isometricprojection

  4. DRAWING TERMINOLOGY OBSERVATORY p., 343

  5. PROJECTIONS DIFFER IN 2 ASPECTS: DIFFERENCE #1 DIFFERENCE #2 Angle between the visual rays & the sheet of paper. • Position of the object with respect to the surface it is drawn on. • The table on the next slide will illustrate these differences.

  6. COMMON TYPES OF PROJECTIONS OBSERVATORY p., 344

  7. DEF: an orthogonal projection is a projection in which the visual rays are perpendicular from the surface of the paper. ORTHOGONAL PROJECTIONS

  8. PROJECTIONS

  9. ISOMETRIC vs. OBLIQUE ISOMETRIC OBLIQUE

  10. DEF: an isometric projection is a “perspective” drawing of an object where the principal edges are arranged on 3 isometric angles (120o degrees). ISOMETRIC PROJECTIONS

  11. ISOMETRIC PROJECTIONS OBSERVATORY p., 347 OBSERVATORY p., 347

  12. Isometric drawing 50 To create the box, use construction lines to outline an isometric box as large as the overall object to be drawn. We will illustrate the main stages of isometric drawing of the object shown above in multi-view. We will use a method called box construction. The vertical axis is equal to the real height. The two other axes, drawn at 30° to horizontal, correspond to the actual width and length of the object. 20 20 28 35 10 14 8

  13. Isometric drawing Measurements are reported on the isometric axes, or on lines parallel to these axes. The box is an isometric drawing as large as the overall object to be shown. Its lines are drawn very faintly. The object is drawn by removing volumes from the box. A 30º- 60º set square is used to trace the isometric lines.

  14. Isometric drawing Measurements are reported on the isometric axes, or on lines parallel to these axes. The box is an isometric drawing as large as the overall object to be shown. Its lines are drawn very faintly. The object is drawn by removing volumes from the box. A 30º- 60º set square is used to trace the isometric lines.

  15. Isometric drawing STAGE 1 STAGE 2 STAGE 3 STAGES OF DRAWING IN ISOMETRIC PERSPECTIVE Measure on the axesand trace the details in construction lines. Carry out the final layout. Sketch the box.

  16. Isometric drawing STAGES OF DRAWING IN ISOMETRIC PERSPECTIVE STAGE1 STAGE2 STAGE3 Measure on the axes and trace the details in construction lines. Carry out the final layout. Sketch the box.

  17. DEF: a multi-view projection is a 2-D representation of the different views on an object. MULTI-VIEW PROJECTIONS

  18. MULTI-VIEW PROJECTIONS OBSERVATORY P., 345

  19. MULTI-VIEW PROJECTIONS OBSERVATORY P., 346

  20. Try it yourself! • Begin working on the lab entitled projections. • Answer all questions on pages 1-2 and complete the multi-view projection.

  21. PERSEPCTIVE Drawings with “perspective” represent all 3 dimensions in a single view.

  22. DEF: a perspective drawing in which one of the sides of the object is parallel to the paper, but the depth is represented by parallel lines drawn at oblique angles. OBLIQUE PROJECTIONS

  23. 3 main drawings used in an engineering projects are: General Exploded views Detail Drawings THE USE OF PROJECTIONS IN ENGINEERING DRAWINGS

  24. GENERAL DRAWINGS An engineering drawing that shows the overall design of an object. OBSERVATORY p., 349

  25. EXPLODED-VIEW DRAWINGS An engineering drawing that shows the different parts, or features, of the object separately. OBSERVATORY p., 349

  26. DETAIL DRAWINGS An engineering drawing that specifies all of the details necessary to make a particular part of an object.

  27. TYPES OF ENGINEERING DRAWINGS

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