ASME Y14.3:2012 pdf download

ASME Y14.3:2012 pdf download.Orthographic and Pictorial Views
1 GENERAL
1.1 Scope This Standard establishes the requirements for creat- ing orthographic, and pictorial views on engineering drawing graphic sheets and in models. View require- ments are generally the same regardless of how they are created. Specifc requirements that are applicable only to constructed or to saved views are defned throughout the standard. The topics covered include the multiview system of drawing, selection, and arrangement of orthographic views, auxiliary views, section views, details, pictorial views, conventional representation of features with some practices applicable only to constructed views, practices applicable to saved views on drawing graphic sheets, and practices applicable only to saved views in models. The methods for constructing orthographic and pic- torial views are beyond the scope of this Standard. Space geometry and space analysis and applications are included in the appendices for informational purposes. 1.2 ASME Y14 Series Conventions The following conventions in paras. 1.2.1 through 1.2.10 are used in this and other ASME Y14 series of standards. 1.2.1 Mandatory, Nonmandatory, Guidance, and Optional Words (a) The words “shall” and “will” establish a manda- tory requirement. (b) The words “should” and “may” establish a rec- ommended practice. (c) The words “typical,” “example,” “for reference,” or the Latin abbreviation “e.g.,” indicate suggestions given for guidance only. (d) The word “or” used in conjunction with a manda- tory requirement or a recommended practice indicates that there are two or more options for complying with the stated requirement or practice.
1.2.3 Invocation of Referenced Standards. The fol- lowing examples defne the invocation of a standard when specifed in the references section and referenced in the text of this Standard: (a) When a referenced standard is cited in the text with no limitations to a specifc subject or paragraphs(s) of the standard, the entire standard is invoked. For example, “dimensioning and tolerancing shall be in accordance with ASME Y14.5” is invoking the com- plete standard because the subject of the standard is dimensioning and tolerancing and no specifc subject or paragraph(s) within the standard are invoked. (b) When a referenced standard is cited in the text with limitations to a specifc subject or paragraph(s) of the standard, only the paragraph(s) on that subject is invoked. For example, “assign part or identifying num- bers in accordance with ASME Y14.100” is only invok- ing the paragraph(s) on Part or Identifying Numbers because the subject of the standard is engineering draw- ing practices and part and identifying numbers is a spe- cifc subject within the standard. (c) When a referenced standard is cited in the text without an invoking statement, such as “in accordance with,” the standard is for guidance only. For example, “for gaging principles see ASME Y14.43” is only for guidance, and no portion of the standard is invoked. 1.2.4 Parentheses Following a Defnition. When a defnition is followed by a standard referenced in paren- theses, the standard referenced in parentheses is the source for the defnition.
1.2.6 Acronyms and Abbreviations. Acronyms and abbreviations are spelled out the frst time it is used in this Standard, followed by the acronym or abbreviation in parentheses. The acronym is used thereafter through- out the text. 1.2.7 Units. The International System of Units (SI) is featured in this Standard. It should be understood that U.S. customary units could equally have been used without prejudice to the principles established. 1.2.8 Figures. The fgures in this Standard are intended only as illustrations to aid the user in under- standing the practices described in the text. In some cases, fgures show a level of detail as needed for empha- sis. In other cases, fgures are incomplete by intent so as to illustrate a concept or facet thereof. The absence of fgure(s) has no bearing on the applicability of the stated requirements or practice. To comply with the require- ments of this Standard, actual data sets shall meet the content requirements set forth in the text. To assist the user of this Standard, a listing of the paragraph(s) that refer to an illustration appears in the lower right- hand corner of each fgure. This listing may not be all-inclusive. The absence of a listing is not a reason to assume inapplicability. Most fgures are illustrations of models in a three-dimensional environment. Figures illustrating drawings in digital format have a border included. When the letter “h” is used in fgures for letter heights or for symbol proportions, select the applicable letter height in accordance with ASME Y14.2.