Engineering H191 Engineering Fundamentals and Laboratory I

# Engineering H191 Engineering Fundamentals and Laboratory I

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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. Object for Practice AU 2005

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

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

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

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

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

16. Isometric View AU 2005

17. 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

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

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

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

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

22. 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

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

24. Isometric of Hollow Pipe AU 2005

25. 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

26. 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

27. 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

28. 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

29. 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

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