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2 Line Conventions and Lettering

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• Identify the standard alphabet of lines.• Describe the types of lines by appearance and

purpose.• Identify the style of lettering recommended for

standard industrial drawings.


Line Conventions

• A convention is a generally accepted way of doing something

• A list of line types is used throughout industry to show the conventional practice for industrial prints

• This list is defined in many references as the alphabet of lines


Alphabet of Lines

• Most common line types:– Visible lines– Hidden lines– Center lines


Visible Lines


Hidden Lines


Center Lines


Alphabet of Lines

• Line types used in section views:– Section lines– Cutting-plane lines– Short break lines


Lines Types Used in Section Views


Alphabet of Lines

• Line types used in dimensioning:– Extension lines– Dimension lines– Leader lines


Lines Types Used in Dimensioning


Alphabet of Lines

• Additional line types:– Break lines– Phantom lines– Stitch lines– Chain lines


Lettering

• In engineering drawings, the text and numeric information is referred to as lettering

• Lettering is:– Uppercase– Vertical structure– Single stroke– Gothic



• What is the alphabet of lines?

A list of line types used throughout industry with each line type having a specific form to represent a certain meaning.


• Describe in terms of the alphabet of lines the lines that appear in this illustration

Visible lines, hidden lines, center lines, phantom lines, section lines, cutting-plane line, viewing-plane line, dimension lines, extension lines, leader lines, and chain line.


• Describe standard lettering as illustrated here

Single-stroke, Gothic style, uppercase letters