DOE-HDBK-1016/2-93Engineering Fabrication,ENGINEERING FABRICATION, CONSTRUCTION,Construction, and Architectural DrawingsAND ARCHITECTURAL DRAWINGSRev. 0Page 5PR-06DimensioningDrawingsFor any engineering fabrication, construction, or architectural drawing to be of value, exactinformation concerning the various dimensions and their tolerances must be provided by thedrawing. Drawings usually denote dimensions and tolerances per the American NationalStandards Institute (ANSI) standards. These standards are explained in detail in Dimensioningand Tolerancing, ANSI Y14.5M - 1982. This section will review the basic methods of denotingdimensions and tolerances on drawings per the ANSI standards. Dimensions on a drawing can be expressed in one of two ways. In the first method, the drawingis drafted to scale and any measurement is obtained by measuring the drawing and correcting forthe scale. In the second method, the actual dimensions of the component are specified on thedrawing. The second method is the preferred method because it reduces the chances of errorand allows greater accuracy and drawing flexibility. Because even the simplest component hasseveral dimensions that must be stated (and each dimension must have a tolerance), a drawingcan quickly become cluttered with dimensions. To reduce this problem, the ANSI standardsprovide rules and conventions for dimensioning a drawing. The basic rules and conventionsmust be understood before a dimensioned drawing can be correctly read.
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