Copyright Goodheart-Willcox Co., Inc. 86 AutoCAD and Its Applications—Advanced All of the options of the UCS command can be selected from the UCS icon shortcut menu, which is accessed by right-clicking on the UCS icon. See Figure 4-9. The options are discussed in this chapter as they apply. Moving and Rotating the UCS Earlier in this chapter, you used spherical coordinates to locate a small sphere on the surface of a larger sphere. You also drew a cone with the center of its base on the surface of the large sphere. However, the axis of the cone, which is a line from the center of the base to the tip of the cone, is not pointing to the center of the sphere. Refer to Figure 4-3. This is because the Z axes of the large sphere and cone are parallel to the world coordinate system (WCS) Z axis. The WCS is the default coordinate system of AutoCAD. In order for the axis of the cone to project from the sphere’s center point, the UCS must be changed. Working with different UCSs is discussed in more detail in the next section. However, the following is a quick overview and describes how to draw a cone with its axis projecting from the center of the sphere. UCS icon selected Pick Move and Align option UCS icon aligned with top face of wedge A B Figure 4-8. A—To align the UCS with the face of an object, select the UCS icon and pick Move and Align from the UCS icon origin grip menu. B—The UCS icon is dragged over an edge and a point is selected using object snaps. UCS icon shortcut menu Figure 4-9. The UCS icon shortcut menu provides access to the options of the UCS command and UCS icon settings.