Drafting Techniques, Continued
PLASTIC-GRAPHITE: Plastic-graphite leads are similar to plastic leads but
are produced differently. The two types of plastic-graphite leads are fired
and extruded. Plastic-graphite leads produce good opaque lines suitable for
microform reproduction. They do not smear easily and also erase well.Line
resolution is of paramount importance.
Crisp, black line work and lettering
indicate good pencil technique.
Figure 3-2 illustrates good pencil techniques.
Figure 3-2.Pencil techniques.
You may use any type of pen to ink over pencil tracings.
The most common
types in use are the ruling pen with an adjustable blade and the technical
reservoir pen. Reservoir pens are gaining in popularity because you can
connect them to compass legs to draw circles.
Figure 3-3 is a compass attachment for a reservoir pen.
compass attachment to
hold reservoir pens.
Continued on next page