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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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Isometric pictorials l.jpg

Isometric Pictorials

Goals

Creating an isometric sketch


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Introduction to ProjectionsFour Basic Types

Note: An Isometric is special case of an Axonometric

Orthographic Projections

Axonometric

Pictorials

Oblique

Perspective


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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


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60o

60o

30o

30o

Isometric Axis

  • Making an Isometric Sketch

  • Defining Axis


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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


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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


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Usage of the Grid Paper

Correctorientation

Incorrect orientation

Note the alignment of the axes


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The Transformation BetweenThe Isometric Grid & Rectilinear Grid


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Object for Practice


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Front Face

Height

Width

Blocking in the Object

Begin with Front Face


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SideFace

Height

Depth

Blocking in the Object

Add Side Face


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Top Face

Blocking in the Object

Add Top Face


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Adding Detail

Cut Outs – Part 1


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Adding Detail

Cut Outs – Part 2


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Adding Detail

Cut Outs – Part 3


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Darken Final Lines

Part 4

Note:

All visible edges

will be darkened


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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


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Isometric ellipses

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

  • Holes

  • Cylinders


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Ellipses Can be in Any of Three Planes


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Sketching an Isometric of a Hollow Pipe


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Diameter

Diameter

Length

Step 1 - Creating the Base Box


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- 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)


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Sketch in Arcs

Tangent Points

Step 3 – Ellipse on Front Face


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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


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Create Box for Hole

Sketch Ellipse

Step 4 – Ellipse for Hole on Front Face


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Isometric of Hollow Pipe


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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


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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)?


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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


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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.


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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.


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In Class Assignment

  • Drawing 9: TG 2.23, 2.31, 2.37, & 2.38 in course packet

    • Use Isometric Sketch Paper (ISP)


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Assignments

  • Refer to daily assignment list


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