Lines in Isometric Drawing
♦ Hidden Lines
The use of hidden lines in isometric drawing is governed by
the same rules as in all other types of projection: Hidden lines
are omitted unless they are needed to make the drawing
clear. If a projecting part cannot be clearly shown with out the
use of hidden lines, then hidden lines are needed.
♦ Center Lines
The use of center lines in isometric drawing is governed by
the same rules as in multi view drawing: center lines are
drawn if they are needed to indicate symmetry, or if they are
needed for dimensioning. In general, center lines should be
used sparingly, and omitted in cases of doubt. The use of too
many center lines may produce a confusion of lines, which
diminishes the clearness of the drawing.