- 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
3.14 Angles in Isometric
Angles project true size only when the plane containing the angle is parallel to the plane of projection. An angle may project to appear larger or smaller than the true angle depending on its position.
Because the various surfaces of the object are usually inclined to the front plane of projection, they generally will not be projected true size in an isometric drawing.
STEP by STEP: HOW TO DRAW ANGLES IN ISOMETRIC
The multiview drawing at left shows three 60° angles. None of the three angles will be 60° in the isometric drawing.
Lightly draw an enclosing box using the given dimensions, except for dimension X, which is not given.
To find dimension X, draw triangle BDA from the top view full size, as shown.
Transfer dimension X to the isometric to complete the enclosing box. Find dimension Y by a similar method and then transfer it to the isometric.
Complete the isometric by locating point E by using dimension K, as shown. A regular protractor cannot be used to measure angles in isometric drawings. Convert angular measurements to linear measurements along isometric axis lines.
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