Chapter 8 Pictorial drawing: Isometric and oblique parallel projection After studying this chapter and working through the problems you should be able to do the following: produce isometric and oblique pictorial drawings from orthogonal views select the best viewing direction when making a pictorial drawing understand the relationship between two- and three-dimensional drawings

Figure 8.1 – Foreshortening of cube edges

Figure 8.2 – Concept of isometric axes

Figure 8.3 – Making an isometric scale

Figure 8.4 – Selection of isometric axes (d) (a) (b) (c) (e) (f) (g) (h) (i) (j)

Figure 8.5 – Isometric circles—ordinate method

Figure 8.6 – Isometric circles—four-centre method (b) half circles (c) quarter circles (a) full circles

Figure 8.7 – Isometric curves

Figure 8.8 – Isometric angles and non-isometric lines (a) isometric angles (b) non-isometric lines

Figure 8.9 – Making an isometric drawing (b) (e) (c) (f)

Figure 8.10 – Pictorial representation of fillets and rounds

Figure 8.11 – Pictorial representation of threads

Figure 8.12 – Pictorial representation of sections

Figure 8.13 – Dimensioning pictorial views

Figure 8.14 – Oblique parallel projection

Figure 8.15 – Length of depth lines in oblique parallel projection

Figure 8.16 – Irregular face parallel to picture plane

Figure 8.17 – Longest dimension parallel to picture plane

Figure 8.18 – Preferred pictorial view

Figure 8.19 – Oblique circles

Figure 8.20 – Oblique angles

Figure 8.21 – Selection of oblique axes