2. 2 Line Conventions and Lettering

3. 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.

4. 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

5. Permission granted to reproduce for educational use only. Alphabet of Lines Most common line types: –Visible lines –Hidden lines –Center lines

6. Permission granted to reproduce for educational use only. Visible Lines

7. Permission granted to reproduce for educational use only. Hidden Lines

8. Permission granted to reproduce for educational use only. Center Lines

9. Permission granted to reproduce for educational use only. Alphabet of Lines Line types used in section views: –Section lines –Cutting-plane lines –Short break lines

10. Permission granted to reproduce for educational use only. Lines Types Used in Section Views

11. Permission granted to reproduce for educational use only. Alphabet of Lines Line types used in dimensioning: –Extension lines –Dimension lines –Leader lines

12. Permission granted to reproduce for educational use only. Lines Types Used in Dimensioning

13. Permission granted to reproduce for educational use only. Alphabet of Lines Additional line types: –Break lines –Phantom lines –Stitch lines –Chain lines

14. Permission granted to reproduce for educational use only. Lettering In engineering drawings, the text and numeric information is referred to as lettering Lettering is: –Uppercase –Vertical structure –Single stroke –Gothic

15. Permission granted to reproduce for educational use only.

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. Permission granted to reproduce for educational use only. 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. Permission granted to reproduce for educational use only. Describe standard lettering as illustrated here Single-stroke, Gothic style, uppercase letters