- Understanding Solid Objects
- Understanding Sketching Techniques
- 3.1 Technique of Lines
- 3.2 Sketching Straight Lines
- 3.3 Sketching Circles, Arcs, and Ellipses
- 3.4 Maintaining Proportions
- 3.5 One-View Drawings
- 3.6 Pictorial Sketching
- 3.7 Projection Methods
- 3.8 Axonometric Projection
- 3.9 Isometric Projection
- 3.10 Isometric Drawings
- 3.11 Making an Isometric Drawing
- 3.12 Offset Location Measurements
- 3.13 Hidden Lines and Centerlines
- 3.14 Angles in Isometric
- 3.15 Irregular Objects
- 3.16 Curves in Isometric
- 3.17 True Ellipses in Isometric
- 3.18 Orienting Ellipses in Isometric Drawings
- 3.19 Drawing Isometric Cylinders
- 3.20 Screw Threads in Isometric
- 3.21 Arcs in Isometric
- 3.22 spheres in Isometric
- 3.23 Oblique Sketches
- 3.24 Length of Receding Lines
- 3.25 Choice of Position in Oblique Drawings
- 3.26 Ellipses for Oblique Drawings
- 3.27 Angles in Oblique Projection
- 3.28 Sketching Assemblies
- 3.29 Sketching Perspectives
- 3.30 Curves and Circles in Perspective
- 3.31 Shading
- 3.32 Computer Graphics
- 3.33 Drawing on Drawing
- Key Words
- Chapter Summary
- Worksheets
- Review Questions
- Sketching Exercises
This chapter is from the book
This chapter is from the book
This chapter is from the book
3.11 Making an Isometric Drawing
Rectangular objects are easy to draw using box construction, which consists of imagining the object enclosed in a rectangular box whose sides coincide with the main faces of the object. For example, imagine the object shown in the two views in the Step by Step feature at right enclosed in a construction box, then locate the features along the edges of the box as shown.
The Step by Step feature on the next page shows how to construct an isometric drawing of an object composed of all “normal” surfaces. Normal is used technically to mean “at right angles.” A normal surface is any surface that is parallel to the sides of the box. Notice that all measurements are made parallel to the main edges of the enclosing box—that is, parallel to the isometric axes. No measurement along a nonisometric line can be measured directly with the scale, as these lines are not foreshortened equally to the normal lines. Start at any one of the corners of the bounding box and draw along the isometric axis directions.
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3.43 Isometric drawings are not typically dimensioned. When they are, the dimensions should appear in the same plane as the isometric axes and read from the bottom of the sheet or aligned in the isometric planes. (Courtesy of Brandon Wold.)
STEP by STEP: BOX CONSTRUCTION
Follow these steps to create an isometric sketch of a rectangular object.
Lightly draw the overall dimensions of the box.
Draw the irregular features relative to the sides of the box.
Darken the final lines.
STEP by STEP: DRAWING NORMAL SURFACES IN ISOMETRIC
Follow these steps to create an isometric drawing of the object shown below, which has normal surfaces only.
Select axes along which to block in height, width, and depth dimentions.
Locate main areas to be removed from the overall block. Lightly sketch along isometric axes to define portion to be removed.
Lightly block in any remaining portions to be removed through the whole block.
Lightly block in features to be removed fom the remaining shape along isometric axes.
Darken final lines.
