STANDARDS

American industry has adopted a new standard, Geometrical Dimensioning and Tolerancing, ANSI Y14.5M-1982. This standard is used in all blueprint production whether the print is drawn by a human hand or by computer-aided drawing (CAD) equipment. It standardizes the production of prints from the simplist hand-made job on site to single or multiple-run items produced in a machine shop with computer-aided manufacturing (CAM) which we explained in chapter 2. DOD is now adopting this standard For further information, refer to ANSI Y14.5M-1982 and to Introduction to Geometrical Dimensioning and Tolerancing, Lowell W. Foster, National Tooling and Machining Association, Fort Washington, MD, 1986.

The following military standards contain most of the information on symbols, conventions, tolerances, and abbreviations used in shop or working drawings:

Flgure 4-19.-Typical examples of symbol use.

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