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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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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

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

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

The Transformation BetweenThe Isometric Grid & Rectilinear Grid

Cut Outs – Part 1

Cut Outs – Part 2

Cut Outs – Part 3

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

Sketching an Isometric of a Hollow Pipe

- 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)Repeat for ellipse on rear face

Draw Tangent Lines for Profile

Complete Visible Part of Back Ellipse

Step 3 – Ellipse on Back Face and ProfileSummary

- 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)?

- 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

- 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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