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The stroke thickness is related to the character height (for example, 2.5 mm high characters would have a stroke thickness - pen nib size - of 0.25 mm, 3.5 would use a 0.35 mm pen and so forth).
Range of Nominal Sizes – The nominal size is typically one of the sequence 2.5 mm, 3.5 mm, 5 mm, 7 mm, 10 mm, 14 mm, 20 mm. Successive members of this sequence are approximately in a ratio of the square root of 2, as in the ISO 216 series of paper sizes.
Therefore, a drawing will indicate both its scale (ratio) and the unit of measurement being used. In Britain, and elsewhere, the standard units used on architectural drawings are the (SI) units millimetres (mm) and metres (m), whereas in France centimetres (cm) and metres are most often used.
Means that a feature of size is at the limit of its size tolerance in the direction that leaves the most material on the part. Thus an internal feature of size (e.g., a hole) at its smallest diameter, or an external feature of size (e.g., a flange) at its biggest thickness. The GD&T symbol for MMC is a circled M.
3.175 mm An historic scale for ships, also used for spacecraft. 1:91.44: 3.333 mm A popular scale for World War II hobbyist miniature wargaming. Also known as "20 mm figure scale" in wargaming. 1:90: 3.387 mm A scale proposed by some European manufacturers (e.g. Wiking) to supersede HO scale. 1:87.1: 3.5 mm: Model railways (HO/h0)
Thickness for pens and plot: 0.13 mm Gray, 0.18 mm Red, 0.25 mm White, 0.35 mm Yellow, 0.50 mm Magenta, 0.70 mm Blue, 1.00 mm Green. In AutoCAD usually parts to be printed in black are drawn in 1 to 7 basic colors. Color layer: Green-Center, Magenta-Measure of length, and Blue-Hidden.
Letter templates are used for drawing text, including digits and letter characters. Diagrams are usually of a standard letter shape and size to conform to standards of encodings (e.g. DIN or ANSI). For example, in Finland the series used is 1.8 mm, 2.5 mm, 3.5 mm, 5.0 mm and 7.0 mm.
The term "isometric" comes from the Greek for "equal measure", reflecting that the scale along each axis of the projection is the same (unlike some other forms of graphical projection). An isometric view of an object can be obtained by choosing the viewing direction such that the angles between the projections of the x , y , and z axes are all ...