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Isometric Pictorials

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Isometric Pictorials

Goals

Creating an isometric sketch

Note: An Isometric is special case of an Axonometric

Orthographic Projections

Axonometric

Pictorials

Oblique

Perspective

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

Correctorientation

Incorrect orientation

Note the alignment of the axes

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

- 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

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

Diameter

Diameter

Length

- Corner to corner to get center

- Lines to tangent points

Tangent Points

Lines to Tangent Points

Sketch in Arcs

Tangent Points

Repeat for ellipse on rear face

Draw Tangent Lines for Profile

Complete Visible Part of Back Ellipse

Create Box for Hole

Sketch Ellipse

- 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

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.

- 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.

- Drawing 9: TG 2.23, 2.31, 2.37, & 2.38 in course packet
- Use Isometric Sketch Paper (ISP)

- Refer to daily assignment list