190 Section 2 Drafting Techniques and Skills
Enlarge or Reduce a
Plane Figure Using
Grid Squares
may be enlarged or reduced figures
in size by using the grid square method
shown in Figure 6-40. In this method, a grid
of squares is drawn to establish a different
size in relation to the original object. This
method is similar to the duplication method
previously discussed for plane figures with fi
irregular curves. However, grid squares are
drawn instead of reference lines, and the lines
and curves making up the plane figure are fi
plotted on the squares.
Figure 6-40. Plane fi gures can be enlarged or reduced in size by using the grid square method. With this
method, grid squares are drawn and points are plotted to defi ne the lines and curves. The fi gure shown is drawn
at twice the size of the original.
Original Size
Twice Size
Enlarge or Reduce
an Object Using
the Scale Command
CAD
The
Scale
command is used to enlarge or
reduce objects in size. After entering the com-
mand, select the objects to scale. You can enter
a scale factor for the enlargement or reduction,
or you can specify a reference dimension. The
object is scaled in relation to the base point you
select. If you do not want to affect the existing
object, you can make a copy of the object during
the scale operation. The following procedure
scales an object using a scale factor.
1. The object to be scaled is given,
Figure 6-41A.
2. Enter the
Scale
command. Select the lines
making up the bolt.
3. Select the base point. Use the Endpoint
object snap to select the lower-left corner
of the bolt head.
4. Enter a scale factor of .5. This scales the object
to half the size of the original, Figure 6-41B.