Line Conventions and Lettering

2. 2 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. Describe standard lettering as illustrated here Single-stroke, Gothic style, uppercase letters