ASME Y14-41:2003 pdf download

ASME Y14-41:2003 pdf download.DIGITALPRODUCT DEFINITION DATA PRACTICES
1 GENERAL
1.1 Scope
This Standard establishes requirements and refer- ences documents applicable to the preparation and revi- sion of digital product definition data, hereafter referred to as data sets. This Standard defines exceptions and additional requirements to existing ASME standards for using product definition digital data sets or drawings in digital format. Where no exception or additional re- quirements are stated, existing ASME standards shall apply.
1.2 Structure of Standard
This Standard supports two methods of application: model only, and model and drawing in digital format. The structure starts with the requirements common to both methods, and then branches to the other sections that have differing requirements for each method. In addition, it provides a guide for the many CAD software packages to develop better modeling and annotation practices for computer aided design and engineering disciplines.
1.3 Figures
The figures in this Standard are intended only as illus- trations to aid the user in understanding the practices described in the text. In some cases, figures show a level of detail as needed for emphasis; in other cases, figures are only complete enough to illustrate a concept or facet thereof. The absence of figures has no bearing on the applicability of the specified requirement or practice. To comply with the requirements of this Standard, actual data sets shall meet the content requirements set forth in the text. To assist the users of this Standard, a listing of the paragraph(s) that refer to an illustration appears in the lower right-hand corner of each figure. This listing may not be all-inclusive. The absence of the listing is not a reason to assume inapplicability. Most figures are illustrations of models in a three- dimensional environment. Figures illustrating drawings in digital format have a border included.
1.4 Reference to This Standard
When data sets are based on this Standard, this fact shall be noted in the data setor in a documentreferenced by the data set. References to this Standard shall state ASME Y14.41-2003.
1.9.1 Definitions
annotation: dimensions, tolerances, notes, text, or sym- bols visible without any manual or external manipu- lation. annotation plane: a conceptual plane containing annota- tion that either perpendicularly intersects, or is coinci- dent with one or more surfaces of a feature. assembly model: a model in which the product described is an assembly of two or more items. associated entities: the portion of a product definition to which annotation pertains. associated group: a user-defined set of related digital ele- ments. associativity: the established relationship between digital elements. attribute: a dimension, tolerance, note, text, or symbol required to complete the product definition or feature of the product that is not visible but available upon interrogating the model. data: information represented in a formal manner suit- able for communication, interpretation, or processing by human beings or computers. datum system: a partial or complete datum reference frame. derivative: data duplicated or extracted from the original. A copy of a derivative is also a derivative. design model: the portion of the data set that contains model and supplemental geometry. digital element: geometric element, feature, group of fea- tures, annotation, associated group, or attribute that ex- ists in a data set. digital element identifier: a label or name used to specify a unique digital element. direction dependent tolerance: a tolerance that invokes a zone of parallel lines or curves. geometric element: a graphic entity used in a data set. For example, point, line, plane, surface, solid, model coordinate system, or crosshatching.