DRAFTING AND COMPUTER-AIDED DESIGN 10

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					    DRAFTING AND
COMPUTER-AIDED DESIGN
         10
ISOMETRIC DRAWINGS: THIRD LINES
ISOMETRIC DRAWINGS: THIRD LINES

The following “Third Lines” exercise is
 designed to assist you in developing
 your ability to sketch isometric
 drawings. This exercise involves
 finishing an isometric drawing by adding
 isometric lines parallel to the height,
 depth and width axes.
   ISOMETRIC DRAWINGS: THIRD LINES
To complete the
  isometric drawing
  shown, the third
  lines (isometric
  lines, parallel to the
  height, depth and
  width axes) must be
  drawn in.
ISOMETRIC DRAWINGS: THIRD LINES

In these exercises it will be assumed that
  the boxes being drawn are solid—you
  need not worry about hidden lines.
ISOMETRIC DRAWINGS: THIRD LINES

Remember that the
 isometric lines you
 draw must be
 parallel to one of the
 three axes.
In the following slides,
  you will view the
  step-by-step
  completion of a third
  lines exercise.
ISOMETRIC DRAWINGS: THIRD LINES
 ISOMETRIC DRAWINGS: THIRD LINES
Some tips:
Draw each line only once—do not shade.
Draw the lines lightly (these lines are
 construction lines), then darken each
 line (to make the lines drawing lines)
 when it intersects another line.
ISOMETRIC DRAWINGS: THIRD LINES

Return to the Sketching and Freehand
 Drawing Fundamentals web page to
 print a copy of the third lines exercise.