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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

Goals

Creating an isometric sketch


Introduction to ProjectionsFour Basic Types

Note: An Isometric is special case of an Axonometric

Orthographic Projections

Axonometric

Pictorials

Oblique

Perspective


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


60o

60o

30o

30o

Isometric Axis

  • Making an Isometric Sketch

  • Defining Axis


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


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


Usage of the Grid Paper

Correctorientation

Incorrect orientation

Note the alignment of the axes


The Transformation BetweenThe Isometric Grid & Rectilinear Grid


Object for Practice


Front Face

Height

Width

Blocking in the Object

Begin with Front Face


SideFace

Height

Depth

Blocking in the Object

Add Side Face


Top Face

Blocking in the Object

Add Top Face


Adding Detail

Cut Outs – Part 1


Adding Detail

Cut Outs – Part 2


Adding Detail

Cut Outs – Part 3


Darken Final Lines

Part 4

Note:

All visible edges

will be darkened


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


Isometric ellipses

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

  • Holes

  • Cylinders


Ellipses Can be in Any of Three Planes


Sketching an Isometric of a Hollow Pipe


Diameter

Diameter

Length

Step 1 - Creating the Base Box


- 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)


Sketch in Arcs

Tangent Points

Step 3 – Ellipse on Front Face


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


Create Box for Hole

Sketch Ellipse

Step 4 – Ellipse for Hole on Front Face


Isometric of Hollow Pipe


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


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)?


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


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.


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.


In Class Assignment

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

    • Use Isometric Sketch Paper (ISP)


Assignments

  • Refer to daily assignment list


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