Reading engineering drawings

The following notes and illustrations are intended to assist in reading and understanding simple drawings. In all orthographic drawings, it is necessary to project at least two views of a three dimensional object - or one view and an adequate description in some simple cases, a typical example being the drawing of a ball

Reading Engineering DrawingsOrthographic Drawing Being Projected
Fig. 4.12 Stage 2
Orthographic Drawing Being Projected
Fig. 4.13 Stage 3

for a bearing. A drawing of a circle on its own could be interpreted as the end elevation of a cylinder or a sphere. A drawing of a rectangle could be understood as part of a bar of rectangular cross-section, or it might be the front elevation of a cylinder. It is therefore generally necessary to produce at least two views, and these must be read together for a complete understanding. Figure 4.15 shows various examples where the plan views are identical and the elevations are all different.

A single line may represent an edge or the change in direction of a surface, and which it is will be determined only by reading both views simultaneously. Figure 4.16 shows other cases where the elevations are similar but the plan views are considerably different.

A certain amount of imagination is therefore required when interpreting engineering drawings. Obviously, with an object of greater complexity, the reading of three views, or more, may well be necessary.

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Responses

  • Clorinda Cremonesi
    How to read engineering drawings?
    2 years ago
  • kauko
    How to interpret engineering drawings?
    2 years ago
  • michael
    How to read a profile view on an engineering drawing?
    5 months ago

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