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Engineering H191 Engineering Fundamentals and Laboratory I

Engineering H191 Engineering Fundamentals and Laboratory I. Week 02 Day 03 Isometric Pictorials. Objectives. Projections: The Four Basic Types Creating Isometric sketches Sketching Ellipses. Orthographic Projections. Projections: Four Basic Types.

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Engineering H191 Engineering Fundamentals and Laboratory I

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  1. Engineering H191Engineering Fundamentals and Laboratory I Week 02 Day 03 Isometric Pictorials

  2. Objectives • Projections: The Four Basic Types • Creating Isometric sketches • Sketching Ellipses AU 2005

  3. Orthographic Projections Projections: Four Basic Types Note: Isometric is a special case of Axonometric Axonometric Pictorials Oblique Perspective AU 2005

  4. Introduction to Isometric Projection CUBE • Isometric means equal measure • All planes are equally or proportionately shortened and • tilted • All the major axes (X, Y, Z) are 120 degrees apart AU 2005

  5. 60o 60o 30o 30o Isometric Axis • Making an Isometric Sketch • Defining Axis AU 2005

  6. Height Width Depth • Making an Isometric Sketch • Axis Convention Choose the longest dimension to be the width (or the depth) for optical stability Front view Isometric Axis Convention AU 2005

  7. Height Width Depth • Making an Isometric Sketch • Axis Convention Choose the longest dimension to be the width (or the depth) for optical stability Front view Isometric Axis Convention AU 2005

  8. Height Depth Width • Making an Isometric Sketch • Axis Convention Choose the longest dimension to be the width or the depth for optical stability Front view Isometric Axis Convention AU 2005

  9. Usage of the Grid Paper Correct orientation Incorrect orientation Note the alignment of the axes AU 2005

  10. Going From Isometric to Rectilinear AU 2005

  11. Object for Practice AU 2005

  12. Front Face Height Width Blocking in the Object Begin with Front Face AU 2005

  13. Side Face Height Depth Blocking in the Object: Add Side Face AU 2005

  14. Top Face Blocking in the Object: Add Top Face AU 2005

  15. Adding Detail Cut Outs – Part 1 AU 2005

  16. Adding Detail Cut Outs – Part 2 AU 2005

  17. Adding Detail Cut Outs – Part 3 AU 2005

  18. Darken Final Lines - Part 4 Note: All visible edges will be darkened AU 2005

  19. Draw the Isometric • Use Isometric Grid Paper • Block is 6 x 3 x 3 AU 2005

  20. Isometric View AU 2005

  21. Sketching a Circle • Draw a square whose sides are the diameter of the circle. • At the center of each side define the point of tangency for the circle. • Draw the diagonals of the square. • Orient the paper so you can draw equal arcs to construct the circle AU 2005

  22. Isometric ellipses • In an isometric drawing, the object is viewed at an angle, which makes circles appear as ellipses. • Holes • Cylinders AU 2005

  23. Ellipses Can be in Any of Three Planes AU 2005

  24. Sketching an Isometric of a Hollow Pipe AU 2005

  25. Diameter Diameter Length Step 1 – Creating the Base Box AU 2005

  26. - Corner to corner to get center - Lines to tangent points Tangent Points Lines to Tangent Points Step 2 – Ellipse on Front Face AU 2005

  27. Sketch in Arcs Tangent Points Step 3 – Ellipse on Front Face AU 2005

  28. Repeat for ellipse on rear face Draw Tangent Lines for Profile Complete Visible Part of Back Ellipse Step 3 – Ellipse on Back Face and Profile AU 2005

  29. Create Box for Hole Sketch Ellipse Step 4 – Ellipse for Hole on Front Face AU 2005

  30. Isometric of Hollow Pipe AU 2005

  31. Summary • Technical drawings are an effective communication media • Projections of various types can be used • Isometric projections and creating isometric sketches has been introduced • Assignments will emphasize simple isometric sketches AU 2005

  32. Review Questions b) c) d) a) 120° 60° 60° 90° 60° 120° 120° 240° • _______ sketches present the object in a single view, with all three dimensions represented • _______ sketches present the object in a series of projections, each one showing only two of the objects’ three dimensions • Which among the following is NOT an isometric axes (Hint: Use the Isometric Grid paper for reference)? AU 2005

  33. Tips for Drawing Assignments • Follow Sketching and Text conventions from the reading assignment • Refer to reading assignment to clarify questions • Title Information is required. Avoid labels on the sketch. • Leave the construction lines – MUCH lighter and thinner than the finished lines • Include centerlines on isometrics AU 2005

  34. Tips for Drawing Assignments • Do not try to shade drawing – this is not a pencil sketching class. • Use grid paper. Try to sketch along grid lines. Practice sketching straight lines and curves on a grid sheet. AU 2005

  35. Tips for Pictorial Views • In pictorial views, hidden lines are not shown unless absolutely required for clarity • Non-visible bottom of a blind hole • Important feature of object not in direct view • In pictorial views, holes or notches without bottom/end visible should be assumed to go completely through the object. • Centerlines are to be shown on all isometric pictorials. AU 2005

  36. In Class Assignment • TG 2.23, 2.33, 2.36, & 2.38 in course packet • Use Isometric Sketch Paper (ISP) AU 2005

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