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Isometric Pictorials

Isometric Pictorials. Goals Creating an isometric sketch. Introduction to Projections Four Basic Types. Note: An Isometric is special case of an Axonometric. Orthographic Projections. Axonometric. Pictorials. Oblique. Perspective. Introduction to Isometric Projection. CUBE.

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Isometric Pictorials

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  1. Isometric Pictorials Goals Creating an isometric sketch

  2. Introduction to ProjectionsFour Basic Types Note: An Isometric is special case of an Axonometric Orthographic Projections Axonometric Pictorials Oblique Perspective

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

  4. 60o 60o 30o 30o Isometric Axis • Making an Isometric Sketch • Defining Axis

  5. 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

  6. 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

  7. Usage of the Grid Paper Correctorientation Incorrect orientation Note the alignment of the axes

  8. The Transformation BetweenThe Isometric Grid & Rectilinear Grid

  9. Object for Practice

  10. Front Face Height Width Blocking in the Object Begin with Front Face

  11. SideFace Height Depth Blocking in the Object Add Side Face

  12. Top Face Blocking in the Object Add Top Face

  13. Adding Detail Cut Outs – Part 1

  14. Adding Detail Cut Outs – Part 2

  15. Adding Detail Cut Outs – Part 3

  16. Darken Final Lines Part 4 Note: All visible edges will be darkened

  17. Sketching a Circle • Draw a square whose sides are the diameter of the circle. • 2. At the center of each side define the point of tangency for the circle. • 3. Draw the diagonals of the square. • 4. Orient the paper so you can draw equal arcs to construct the circle

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

  19. Ellipses Can be in Any of Three Planes

  20. Sketching an Isometric of a Hollow Pipe

  21. Diameter Diameter Length Step 1 - Creating the Base Box

  22. - Corner to corner to get center - Lines to tangent points Tangent Points Lines to Tangent Points Step 2 – Ellipse on Front Face(Reference Technical Graphics, Section 4.2.7)

  23. Sketch in Arcs Tangent Points Step 3 – Ellipse on Front Face

  24. 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

  25. Create Box for Hole Sketch Ellipse Step 4 – Ellipse for Hole on Front Face

  26. Isometric of Hollow Pipe

  27. 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

  28. 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)?

  29. 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

  30. 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.

  31. 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.

  32. In Class Assignment • Drawing 9: TG 2.23, 2.31, 2.37, & 2.38 in course packet • Use Isometric Sketch Paper (ISP)

  33. Assignments • Refer to daily assignment list

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