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2022年4月4日 · What is a Datum Reference Frame? Datums are used in Geometric Dimensioning and Tolerancing drawings to create a reference system for inspecting a manufactured part. This reference system is called a Datum Reference Frame …

2023年4月11日 · ASME Y14.5 (1994) defines a datum as “A theoretically exact point, axis, or plane derived from the true geometric counterpart of a specified datum feature. A datum is an origin from which the location or geometric characteristics of features of a part are established.”

2025年1月2日 · Datums are basically the starting point of any measurement—they keep measurements accurate throughout the manufacturing, the assembly, and the quality checks. 1. Primary Datums. When you measure a part, your first …

A datum is a theoretical reference point, line, or plane used to define where measurements and controls should originate on a part. Datums are critical because they establish a consistent frame of reference for defining size, location, orientation, and form in GD&T.

A datum reference or just datum (plural: datums [Note 1]) is some geometrically important part of an object—such as a point, line, plane, hole, set of holes, or pair of surfaces—that serves as a reference in defining the geometry of the object and (often) in measuring aspects of the actual geometry to assess how closely they match with the ...

2024年10月9日 · The three DRF datums—primary, secondary, and tertiary—generate three perpendicular planes that lead to the 3D coordinate system. These datums include datum A, datum B, and datum C. Datum A is the primary reference constraining 3 DoFs. A flat surface or an axis can serve as datum A.

2021年12月11日 · A datum can be, for example, a surface or an axis from a symmetrical feature or other geometrical features. Datum A is the main datum on GD&T tolerances on a part and also the main reference for the other datums (in this case datum B and datum C) on the part.

2020年1月22日 · Datums are used to orient measurements. In the case of something simple such as a perpendicularity specification, the datum is the surface against which the toleranced feature is checked. For a positional tolerance, features are located relative to a datum.

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