What is Drafting?    

  • It is a graphic (pictures) language.
  • Artistic Drawing - expresses a feeling.
  • Technical Drawing (drafting) - expresses an idea.
What is Drafting.jpg

The Purposes and Advantages of Drafting?

  • Used to communicate and develop ideas.
  • It is universal:  
    • Drawings can be understood worldwide.
    • Standards are needed otherwise drawings could not be used in another place easily.  
    • In Canada, standards are decided by the Canadian Standards Association (CSA).

Pencils

  • Darkness is determined by the width of the line and the amount of graphite in the pencil. 
  • Pencil lead is made up of graphite, clay and resin (usually).

 

Harder / Lighter ----------------------------------------------------------------------- Softer / Darker

9H---7H---6H---5H---4H---3H---2H---H---F---B---2B---3B---4B---5B---6B---7B

  • 4H (very light line weight) is used for construction lines, and guidelines (used in lettering). 
  • 4H or 2H (medium line weight) is used for hidden lines, centerlines and section lines.
  • HB (dark line weight) for visible or bodylines and lettering. 

Pens

  •  Inking - darkness is determined by the width of line only. 

Drawing Materials

Some Types of Print Media:

  • Regular Bond Paper - does not erase well. 
  • Plotting Bond Paper
  • Tracing Paper
  • Vellum - erases well but is expensive.
  • Mylar - plastic very strong and expensive.  

Media Sheet Sizes

  • Sheet sizes are multiples of the standard 8-1/2" x 11” sheet of paper.
  • This allows for the sheets to be folded down to fit a 9” x 12” envelope.
  • Metric sizes are similar to imperial sizes.

 

Imperial Sheet Sizes

Sheet Size Imperial Dimensions Metric Dimension
Size A 8-1/2" x 11" 280 x 216
Size B 11" x 7" 432 x 280
Size C 17" x 22" 560 x 432
Size D 22" x 34" 864 x 560
Size E 34" x 44" 1118 x 864

Note: Drawing Numbers usually start with the sheet size (ex. Dwg. No. C-215-1324)

  • This makes it easier to find the drawing:
    • A or B size would be in a filing cabinet. 
    • C and above in the drawing draws or hangers

Metric Sheet Sizes

Sheet Size Metric Dimension Imperial Dimensions
Size A4 297 x 210 11-1/16" x 8-9/16"
Size A3 420 x 297 16-1/2" x 11-1/16"
Size A2 594 x 420 23-3/8" x 16-1/2"
Size A1 841 x 594 23-3/8" x 23-3/8"
Size A0 1189 x 841 46-13/16" x 33-1/8"

Note: Drawing Numbers usually start with the sheet size (ex. Dwg. No. A4-215-1324)