ASME Y14.2-2014 pdf free download.Line Conventions and Lettering Engineering Drawing and Related Documentation Practices
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.
1.2.9 Precedence of Standards. The following are ASME Y14 standards that are basic engineering drawing standards:
ASME Y14.1 Decimal Inch Drawing Sheet Size and Format
ASME Y14.1M Metric Drawing Sheet Size and Format
ASME Y14.2 Line Conventions and Lettering
ASME Y14.3 Orthographic and Pictorial Views
ASME Y14.5 Dimensioning and Tolerancing
ASME Y14.24 Types and Applications of Engineering Drawings
ASME Y14.34 Associated Lists
ASME Y14.35 Revision of Engineering Drawings and Associated Documents
ASME Y14.36M Surface Texture Symbols
ASME Y14.38 Abbreviations and Acronyms for Use on Drawings and Related Documents
ASME Y14.41 Digital Product Definition Data Practices
ASME Y14.100 Engineering Drawing Practices
All other ASME Y14 standards are considered specialty types of standards and contain additional requirements or make exceptions to the basic standards as required to support a process or type of drawing. 1.2.10 Unless Otherwise Specified (UOS). The phrase “unless otherwise specified” or UOS is used to indicate a default requirement. The phrase is used when the default is a generally applied requirement and an exception may be provided by another document or requirement.
2 REFERENCES The following revisions of American National Standards form a part of this Standard to the extent specified herein. A more recent revision may be used provided there is no conflict with the text of this Standard. In the event of a conflict between the text of this Standard and the references cited herein, the text of this Standard shall take precedence. ASME Y14.3-2012, Orthographic and Pictorial Views ASME Y14.5-2009, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engineers (ASME), Two Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900 (www.asme.org)
3 DEFINITIONS For definitions and illustrations of line types, see Fig. 3-1.
4 LINE CONVENTIONS
Line conventions describe the size, construction, and application of the various lines used in making drawings.Paragraphs 4.1 through 4.14 identify the type and style of lines for use on drawings.
4.1 Line Widths
Two widths of lines should be used on drawings (see Fig. 3-1). The ratio of line widths should be two-to-one (2:1). Recommended line widths are 0.3 mm minimum for thin lines and 0.6 mm minimum for thick lines. All lines
of the same type shall be uniform throughout the drawing.
4.2 Line Spacing
Spacing between parallel lines may be exaggerated to a maximum of 3 mm, so there is no fill-in when the drawing is reproduced.
4.3 Visible Lines
Visible lines are continuous and shall be used for representing visible edges or contours of objects (see Figs. 3-1 and 4-1).
4.4 Projection Lines
When used, projection lines indicate the line of sight between two successive orthographic views. See ASME Y14.3.ASME Y14.2 pdf download.ASME Y14.2-2014 pdf free download
