Technical Drawing

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

## Title blocks

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A title block should not exceed 170mm in width. Includes enough information to enable the drawing to be completely identified, and some additional and clarifying information. In no particular order:

* Title;
* Drawing number;
* Draughtsperson (Drafter);
* Checker;
* Approver;
* Scale (or not to scale - NTS);
* Dates;
* Sheet number;
* Revisions;
* Units (if other than millimeters);
* Disclaimers including copyright (of both the drawing and the design);
* Context such as company name, address, etc.

Also, some title blocks may include:

* Field for "Next Assembly";
* Field for "Used on";
* Third angle projection clarification;
* Reference number; and
* URL.

## Line types

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Line types are entities used on a drawing that have specific characteristics and meaning. The characteristics may be applied to lines and arcs.

Line types.

Common line types include:

* Continuos / solid
* Center (center line)
* Hidden
* Phantom

## Line widths

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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  |  | stroke-width:0.70mm; stroke-linejoin:bevel
General Outlines  | 0.35mm  |  | stroke-width:0.35mm; stroke-linejoin:miter
Hidden Outlines  | 0.35mm  |  | stroke-width:0.35mm; stroke-linejoin:miter; stroke-dasharray:7,2

Note: Line width is different than line weight.

## Representation of materials

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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

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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.