Basic requirements for fonts (GB/T14691-1993, GB/T14665-1993):
1. The fonts written in the drawings must be: neat, clear strokes, neatly arranged, evenly spaced.
2. The nominal size series of font height (indicated by h) are: 1.8, 2.5, 3.5, 5.7, 10, 14, 20mm. if you need to write larger characters, the font height should be increased by the ratio of the. The height of the font represents the number of the font.
3. The Chinese characters shall be written in long imitation Song font and shall adopt the simplified characters stipulated in the Simplified Chinese Character Program officially announced by the State Council of the People's Republic of China. The height of the Chinese character h should not be less than 3.5mm, and its character width is generally: h/ .
4. Letters and numbers are divided into type A and type B. The stroke width (d) of type A font is 1/14 of the height (h) of the character; the stroke width (d) of type B font is 1/10 of the height (h) of the character; only one type of font is allowed to be used on the same drawing.
5. Letters and numbers can be written in italic and straight type. Italicized letters are angled to the right at 75° to the horizontal datum line.
6. Numbers and letters used as indices, fractions, limit deviations, footnotes, etc., should generally be in a small font.
Requirements for fonts in CAD:
1, Chinese characters are generally output in block letters; letters and numbers are generally output in italics.
2, the decimal point for output, should occupy a word space, and is located in the center of the lower.
3, punctuation, except for ellipses and dashes for two words, the rest are a symbol of a word.
4, the font height h and drawing width of the relationship between the selection, see Table 1.
5, the font of the smallest word (word) spacing, line spacing, and spacing or the minimum distance between the basic line and the font, see Table 2.