Oblique projection

Figure 6.8 shows part of a plain bearing in orthographic

Planometric Drawing

Fig. 6.3 Construction principles for points in space, with complete solution

Figure 6.8 shows part of a plain bearing in orthographic

View Orthographic Projection Drawing

Fig. 6.3 Construction principles for points in space, with complete solution

Oblique Drawing
7
Oblique Drawings Sketches
Fig. 6.4 Views (b), (c) and (d) are isometric projections of the section in view (a)
Plan Oblique Projection

Fig. 6.6 Isometric constructions for corner radii

Robot Orthographic

Fig. 6.6 Isometric constructions for corner radii projection, and Figs 6.9 and 6.10 show alternative pictorial projections.

It will be noted in Figs 6.9 and 6.10 that the thickness of the bearing has been shown by projecting lines at 45° back from a front elevation of the bearing. Now, Fig. 6.10 conveys the impression that the bearing is thicker than the true plan suggests, and therefore in Fig. 6.9 the thickness has been reduced to one half of the actual size. Figure 6.9 is known as an oblique

Plotted curve

Plotted curve

Oblique Curves

Curve by approximate construction faces and backwards to the opposite sides. Note that the points of tangency are marked, to position the slope of the web accurately.

With oblique and isometric projections, no allowance is made for perspective, and this tends to give a slightly unrealistic result, since parallel lines moving back from the plane of the paper do not converge.

—*

A

V

V

Curve by approximate construction

Fig. 6.7 Relationship between plotted points and constructed isometric circles

Fig. 6.7 Relationship between plotted points and constructed isometric circles

projection, and objects which have curves in them are easiest to draw if they are turned, if possible, so that the curves are presented in the front elevation. If this proves impossible or undesirable, then Fig. 6.11 shows part of the ellipse which results from projecting half sizes back along the lines inclined at 45°.

A small die-cast lever is shown in Fig. 6.12, to illustrate the use of a reference plane. Since the bosses are of different thicknesses, a reference plane has been taken along the side of the web; and, from this reference plane, measurements are taken forward to the boss

Oblique Perspective Curved

Tangency

Tangency

Dimetric Projection
Fig. 6.12

Further information regarding pictorial representations, reference can be made to BS EN ISO 5456 - 3. The Standard contains details of Dimetric, Trimetric, Cavalier, Cabinet, Planometric and Perspective projections.

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  • olga
    How to construct the plan a tetrahedron in an orthographic projection?
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