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Reading Objects

Study missing lines, orthographic views, and reading objects in AutoCAD 2002 2D. Learn about what lines can represent in 3D drawings and identifying parts in multiple views. Practice drawing missing views and orthographic projections.

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Reading Objects

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  1. Reading Objects Lecture 8 Autumn Quarter

  2. Topics For Today • Missing lines and views problems • Reading partial drawings • Orthographic Views in Multiview Drawings • AutoCAD 2002 – 2D Lesson 5 Autumn Quarter

  3. What a line can represent in a 3-D drawing EEdge view of a plane surface, and/or NIntersection of two surfaces, and/or LLimiting element of a curved surface Autumn Quarter

  4. L L N N E E E L L Sample E, N, and L’s Autumn Quarter

  5. Reading an Object • Look for points • Look for lines • Look for planes • Identify these parts in multiple views and the isometric view. Autumn Quarter

  6. Principal Planes - If a plane surface appears in true size in one view, it is parallel to the picture plane of that view and it will appear as an edge in adjacent views. Horizontal Surfaces – true size in top view Vertical Surface – true size in front view Autumn Quarter

  7. Planes – Inclined - If a line represents the edge view of a plane surface in one view, that surface will appear as characteristic shape, but not characteristic size, in other views. Inclined surface – not true size in either view, true length in edge view. Autumn Quarter

  8. Oblique Planes - An oblique surface will not appear as an edge (line) in any view, but will have “characteristic” shape although not true size in all three views. Autumn Quarter

  9. In Class Exercise Given the Top and Front views shown here, how many right side views can you draw? Hint: Verify by sketching the isometric view Autumn Quarter

  10. A B C Possible Solutions There are many more Autumn Quarter

  11. In Class Exercise Add the missing lines to complete the views Autumn Quarter

  12. In Class Exercise – Solution Autumn Quarter

  13. Today’s Assignment • Dwg 15 – MV-1 • Missing Views • Draw the missing view for each object • Due at end of class today • Dwg 16 – Lesson 5, Exercise 3 (page 5-28) • Draw 3-View Orthographic from Isometric • Due at beginning of next lecture Autumn Quarter

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