1. Prints: The Language of Industry1
Prints: The Language of Industry

2. Line Conventions and Lettering2
Line Conventions and Lettering

3. 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.

4. 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

5. Alphabet of Lines Most common line types: Visible lines Hidden lines
Center lines

6. Visible Lines

7. Hidden Lines

8. Center Lines

9. Alphabet of Lines Line types used in section views: Section lines
Cutting-plane lines
Short break lines

10. Lines Types Used in Section Views

11. Alphabet of Lines Line types used in dimensioning: Extension lines
Dimension lines
Leader lines

12. Lines Types Used in Dimensioning

13. Alphabet of Lines Additional line types: Break lines Phantom lines
Stitch lines
Chain lines

14. Lettering
In engineering drawings, the text and numeric information is referred to as lettering
Lettering is:
Uppercase
Vertical structure
Single stroke
Gothic

16. 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.

17. 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.

18. Single-stroke, Gothic style, uppercase letters
Describe standard lettering as illustrated here
Single-stroke, Gothic style, uppercase letters

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