ASME AED-1:2018 pdf free download

ASME AED-1:2018 pdf free download.Aerospace and Advanced Engineering Drawings.
1.2 Conventions
The conventions in paras. 12.1 through 1.2.10 are used in this Standard. With the exception of the system of units described in para. 1.2.7. these conventions are similar to the conventions used in the ASME Y14 standards.
1.2.1 Mandatory, Nonmandatory, Guidance, and Optional Words
(a) The words “shall” and “will” establish a mandatory requirement.
(b) The words “should” and “may” establish a recommended practice.
(c) The words “typicaL”“exampie”“for reference,” and the Latin abbreviation “e.g. indicate suggestions given for guidance only.
(d) The word “er” used in conjunction with a mandatory requirement or a recommended practice indicates that there are two or more options on how to comply with the stated requirement.
1.2.2 Cross-Reference of Standards. Cross-reference of standards in text with or without a date following the standard designator shall be interpreted a follows:
(a) Reference to ASME Y14 standards in the text without a date following the standard designator Indicates that the issue of the standard identified in the References section (section 2) shall be used to meet the requirement
(b) Reference to ASME Y14 standards in the text with a date following the standard designator Indicates that only that issue of the standard shall be used to meet the requirement.
1.2.3 liwocation of Referenced Standards. The following examples define the Invocation of a standard when specified in the References section (section 2) and referenced in the text of this Standard:
(a) When a reference standard Is cited In the text with no limitations to a specific subject or paragraph(s) of the standard, the entire standard is invoked, eg.,”Dimensloning and tolerancing shall be in accordance with ASME Y145” is invoking the complete standard because the subject of the standard is dimensioning and tolerancing 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 the standard, only the paragraph(s) on that subject are invoked. e.g.. “Assign part or identifying numbers in accordance with ASME Y14.100” Is invoking only the paragraph(s) on part or Identifying numbers because the subject of the sta,idard is engineering drawing practices, and part or identifying numbers is a specific subject within the standard.
fr) When a reference standard is cited in the text without an invoking statement such as “in accordance with.” the standard is for guidance only; e.g. “For gaging principles, see ASME Y14.43” is for guidance only, and no 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 drawing entries. Notes depicted in initial uppercase or lowercase letters are to be considered supporting data to the contents of this Standard and are not intended for literal entry on drawings. A statement requiring the addition of a note with the qualifier “such as” is a requirement to add a note, and the content of the text is allowed to vary to suit the application.
1.2.6 Acronyms and Abbreviations. Acronyms and abbreviations are spelled out the first time used in this Standard, followed by the acronym or abbreviation in parentheses. The acronym or abbreviation is used thereafter throughout the text,
1.2.7 Units. U.S. Customary units are featured in this Standard. It should be understood that the International System of Units (SI) could equally have been used without prejudice to the principles established.
5 ASSEMBI.Y TOLERANCING
Assembly dimensioning and Lolerancing pertain to the geometric control of component features that are only applicable on assembly product definitions. This section outlines the conditions necessary for such a practice to be valid.
The following two primaly types of features need to be controlled with tolerance at an assembly level:
(a) Exisrin9 Features With Adjustment atAssembly. The component or subassembly containing the feature has freedom for adlustment during the assembly process to allow the specilled feature to comply with the dimensional requirements after it is assembled as described in par-a. 5.1.