ASME Y14.2:2014 pdf download

ASME Y14.2:2014 pdf download Line Conventions and Lettering Engineering Drawing and Related Documentation Practices
1GENERAL1.1 Scope
This Standard establishes the line and lettering practices for use in the preparation of drawings, including therecognition of the requirements for computer aided design (CAD) and manually prepared drawings. When noexception or additional requirements are stated, existing ASME standards shall apply.
1.2 ASME Y14 Series Conventions
The conventions in paras. 1.2.1 through 1.2.10 are used in this and other ASME Y14 standards.1.2.1 Mandatory,Recommended,Guidance, and Optional Words
(a)The words “shall” and “will”establish a mandatory requirement.(b) The word”should” establishes a recommended practice.
(c)The word “may” establishes an optional practice.
(d) The words “typical,””example,” “for reference,” or the Latin abbreviation “e.g.” indicate suggestions givenfor guidance only.
(e)The word “or”used in conjunction with a mandatory requirement or a recommended practice indicates thatthere are two or more options for complying with the stated requirement or practice.
1.2.2 Cross-Reference of Standards. Cross-reference of standards in text with or without a date following thestandard designator shall be interpreted as follows:
(a)Reference to other ASME Y14 standards in the text without a date following the standard designator indicatesthat the issue of the standard identified in the References section (section 2) shall be used to meet the requirement.(b)Reference to other ASME Y14 standards in the text with a date following the standard designator indicatesthat only that issue of the standard shall be used to meet the requirement.
1.2.3 Invocation of Referenced Standards.The following examples define the invocation of a standard whenspecified in the References section (section 2) and referenced in the text of this Standard:
(a) When a referenced standard is cited in the text with no limitations to a specific subject or paragraph(s) ofthe standard, the entire standard is invoked.For example, “Dimensioning and tolerancing shall be in accordancewith ASME Y14.5″is invoking the complete standard because the subject of the standard is dimensioning andtolerancing and no specific subject or paragraph(s) within the standard are invoked.
(b) When a referenced standard is cited in the text with limitations to a specific subject or paragraph(s) of thestandard, only the paragraph(s) on that subject is invoked.For example, “Assign part or identifying numbers inaccordance with ASME Y14.100″is invoking only the paragraph(s) on part or identifying numbers because thesubject of the standard is engineering drawing practices and part or identifying numbers is a specific subject withinthe 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 andno portion of the standard is invoked.
1.2.4 Parentheses Following a Definition. When a definition is followed by a standard referenced in parentheses,the standard referenced in parentheses is the source for the definition.
1.2.5 Notes.Notes depicted in this Standard in ALL UPPERCASE letters are intended to reflect actual drawingentries.Notes depicted in initial uppercase or lowercase letters are to be considered supporting data to the contentsof this Standard and are not intended for literal entry on drawings. A statement requiring the addition of a notewith the qualifier “such as” is a requirement to add a note, and the content of the note is allowed to vary to suitthe application.
1.2.6 Acronyms and Abbreviations. Acronyms and abbreviations are spelled out the first time used in this Standard followed bythe acronym orabbreviationinparentheses. The acronymis used thereafterthroughoutthe 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 figures in this Standard are intended only as illustrations 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 incomplete by intent so as to illustrate a concept or facet thereof. The absence of figure(s) has no bearing on the applicability of the stated requirements 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 user 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 a listing is not a reason to assume inapplicability. Some figures 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 figures for letter heights or for symbol proportions, select the applicable letter height in accordance with para. 6.4.