Lines, lettering and dimensioning

Think of technical drawing like writing a letter to an engineer who must build exactly what you've designed. Lines are your vocabulary. Continuous thick lines show the object's outline, while thin dashed lines represent hidden edges you cannot see. Dimension lines with arrows tell workers the actual measurements needed.

Lettering must be clear and uniform so nobody misreads your design. According to British Standards (BS), letters should be upright, evenly spaced, and consistent in size. Imagine designing a building plan for a Lagos construction company—poor lettering could cause costly mistakes on site.

Your title block, usually in the bottom right corner, contains your name, the drawing date, scale, and what the drawing shows. Border lines frame your entire drawing professionally. All these elements follow BS 8888 standards to ensure any engineer worldwide understands your work correctly.

Technical drawing is like writing a message to engineers and builders. The lines you draw must follow strict rules so everyone understands the same thing. In Nigeria, when architects design a house in Lagos, they use specific line types: thick solid lines for main outlines, thin lines for hidden details, and dashed lines for construction guides. These rules come from BS 308A, which is the British Standard that guides how technical drawings should look worldwide.

Lettering must be clear and uniform so no one misreads your dimensions. When you write measurements on your drawing—like "5cm" or "3m"—the numbers and letters must be legible and positioned correctly. Dimensioning means adding all necessary measurements to show exact sizes. This prevents confusion on building sites or in factories.