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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 - PowerPoint PPT Presentation
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2 Line Conventions and Lettering
Permission granted to reproduce for educational use only.
• 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.
Permission granted to reproduce for educational use only.
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
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Alphabet of Lines
• Most common line types:– Visible lines– Hidden lines– Center lines
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Visible Lines
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Hidden Lines
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Center Lines
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Alphabet of Lines
• Line types used in section views:– Section lines– Cutting-plane lines– Short break lines
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Lines Types Used in Section Views
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Alphabet of Lines
• Line types used in dimensioning:– Extension lines– Dimension lines– Leader lines
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Lines Types Used in Dimensioning
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Alphabet of Lines
• Additional line types:– Break lines– Phantom lines– Stitch lines– Chain lines
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Lettering
• In engineering drawings, the text and numeric information is referred to as lettering
• Lettering is:– Uppercase– Vertical structure– Single stroke– Gothic
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Permission granted to reproduce for educational use only.
• 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.
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• 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.
Permission granted to reproduce for educational use only.
• Describe standard lettering as illustrated here
Single-stroke, Gothic style, uppercase letters
