112 Section 1 Introduction to Drafting
AutoCAD Example:
Command: extend↵
Current settings: Projection=UCS, Edge=Extend
Select boundary edges…
Select objects or select all:
(pick the objects to use
as a boundary)
1 found
Select objects: ↵
Select object to extend or shift-select to trim or
[Fence/Crossing/Project/Edge/Undo]:
(select the
objects to extend to the boundary)
Select object to extend or shift-select to trim or
[Fence/Crossing/Project/Edge/Undo]: ↵
Command:
Array
The
Array
command is essentially a copy
function. It makes multiple copies of selected
objects in a rectangular or circular (polar) pat-
tern. See Figure 4-15. CAD programs that have
3D drawing capability typically have an option
of the
Array
command to create arrays in 3D.
To create a rectangular array, you typically
select the object(s) to array, specify the number
of rows, specify the number of columns, and then
enter distance or “offset” values for the spacing
of the rows and columns. In Figure 4-15A, the
highlighted bolt head was arrayed to create
a pattern of two rows and three columns. An
offset value of 2.0 (equal to the spacing between
objects) was used for both the row and column
distances.
To create a polar array, you typically select
the object(s) to array, specify a center point about
which to array the object(s), enter the number
of objects in the array, and enter an angular
rotation value. In Figure 4-15B, the highlighted
circle was arrayed about the center point of the
part in a 360° pattern, with a total of 12 objects
specified.fi
AutoCAD Example:
Command: -array↵ y y
(If you enter the command
without the hyphen, the array settings are made in
a dialog box.)
Select objects:
(pick the objects to array)
Select objects: ↵
Enter the type of array [Rectangular/Polar] P: r↵ r r
Enter the number of rows (---) 1: 2↵
Enter the number of columns (|||) 1: 3↵
Enter the distance between rows or specify unit cell
(---): 2↵
Specify the distance between columns (|||): 2↵
Command: -array↵y y
Select objects:
(pick the objects to array)
Select objects: ↵
Enter the type of array [Rectangular/Polar] R: p↵
Specify center point of array or [Base]:
(pick a point
about which the objects will be arrayed)
Enter the number of items in the array: 12↵
Specify the angle to fi ll (+=ccw, –=cw) 360: ↵
Rotate arrayed objects? [Yes/No] Y: n↵
Command:
List/Properties
The
List
and
Properties
commands show
data related to an object. For example, the prop-
erties for a line may include the coordinates of
the endpoints, length, angle from start point,
and change in X and Y coordinates from the
start point. These commands can be useful in
determining the type of object, which layer it is
drawn on, and the color and linetype settings of
the object.
Figure 4-15. Creating rectangular and polar arrays.
A—A pattern of bolt heads drawn as a rectangular
array. The arrayed objects are shown in color. B—The
bolt holes in this part were drawn as a polar array. The
arrayed objects are shown in color.
A
B