Figure 6.9 The direction of sightC. Section Lining
Section lining shows where the object is sliced or cut by the
cutting plane line. Section lining is represented by thin, black
lines drawn at 45^0 to the horizontal. Section lining is spaced
by eye from 1.5mm to 6mm apart, depending up on the
overall size of the object. The average spacing used for most
drawings is 3mm. Section lines must be of uniform thickness
(thin black) and evenly spaced by eye.
If the cutting plane passes through more than two parts,
section lining of each individual part must be drawn at
different angles. Where an angle other than 45^0 is used, the
angle should be 30^0 or 60^0. Section lining should not be
parallel with the sides of the object to be section lined.