Line Conventions and Lettering - PowerPoint PPT Presentation

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Line Conventions and Lettering

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  1. 2 Line Conventions and Lettering

  2. 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.

  3. 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

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

  5. Visible Lines

  6. Hidden Lines

  7. Center Lines

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

  9. Lines Types Used in Section Views

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

  11. Lines Types Used in Dimensioning

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

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

  14. 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.

  15. 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.

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