Chapter 3 Communicating Design Ideas
83
If an object to be drawn is very small, it may be necessary to prepare
drawings to a scale larger than full size. Such a scale is referred to as an
enlarged scale. For example, a drawing that is twice full size has a scale of
2:1. Each 2″ (or each 2 cm) on the drawing paper represents 1″ ″ (or 1 cm) ″
of the actual object. The parts of the compass shown in Figure 3-35 are
drawn twice their actual size.
1 2
3
4
5
5
4
2
3
1
2 2
3
4 4
1
gure 3-32. Rules for creating hidden lines in a drawing.
Detail
dimension
Length: overall dimension
Diameter
dimension
Height:
overall
dimension
Detail
dimension
A
B
gure 3-33. A—Overall and detail
dimensions. B—Dimensioning the size and
location of a circle.
168°
Ø 2″
2
″
31″
8
″
6″
gure 3-34. A scale drawing of a skateboard. In this case,
the drafter included the bottom view instead of a top view
because it shows more detail. Notice that the bottom view
is placed below the front view in an orthographic drawing.