Technical Drawing

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This is a style guide for technical drawing, whether on paper or screen.

Line Types[edit | edit source]

Standard widths: 0.13mm, 0.18mm, 0.25mm, 0.35mm, 0.50mm, 0.70mm. These are designed to be scaled to different ISO standard paper sizes and still be of a standard width (i.e. there is a multiplier of √2 between each).

Use Width Example SVG style guide
Page & title box borders 0.70mm Technical Drawing Line Types, 0.70mm solid.svg stroke-width:0.70mm; stroke-linejoin:bevel
General Outlines 0.35mm Technical Drawing Line Types, 0.35mm solid.svg stroke-width:0.35mm; stroke-linejoin:miter
Hidden Outlines 0.35mm Technical Drawing Line Types, 0.35mm dashed.svg stroke-width:0.35mm; stroke-linejoin:miter; stroke-dasharray:7,2

Title Blocks[edit | edit source]

Include enough information to enable the drawing to be completely understood. In no particular order:

  • Context (of the subject);
  • Draughtsperson;
  • Scale;
  • Date;
  • Revisions;
  • Title;
  • Units (if other than milimeters);
  • Copyright (of both the drawing and the design);
  • Reference number; and
  • URL.

A title block should not exceed 170mm in width.

Representation of Materials[edit | edit source]

Materials are represented by hatch patterns. The patterns are classified under ISO or ANSI guidelines, though other predefined patterns may be used; for instance, ANSI38 is used to denote aluminum. The hatch pattern can only tell what type of material in general form, that is, it does not indicate the specific composition.

Brickwork[edit | edit source]

Brickwork in section is represented by parallel 0.35mm lines, outlining the actual (i.e. scaled) width of the brickwork, with double 0.25mm lines crossing at 45˚, spaced three line-thicknesses apart and such that one pair starts 1/3 of the wall thickness from where the previous pair met the opposite line.