2 Line Conventions and Lettering
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
Alphabet of Lines • Line types used in section views: • Section lines • Cutting-plane lines • Short break lines
Alphabet of Lines • Line types used in dimensioning: • Extension lines • Dimension lines • Leader lines
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