Copyright Goodheart-Willcox Co., Inc. 290 AutoCAD and Its Applications—Advanced PROFESSIONAL TIP PROFESSIONAL TIP You can quickly enter the MOVE, ROTATE, or SCALE command for a subobject by selecting the subobject, right-clicking, and picking the command from the shortcut menu. Rotating Edges Before you select an edge to rotate, do a little planning. Since there are a wide variety of edge rotation options, it will save time if you fi rst decide on the location of the base point about which the edge will rotate. Next, determine the direction and angle of rotation. Based on these criteria, choose the option that will accomplish the task the quickest. To use the ROTATE command to rotate an edge, enter the command and pick the edge using the [Ctrl] key. Select a base point and then enter the rotation. You can also select the edge, pick the edge grip, and cycle to the ROTATE mode. Edges are best rotated using the rotate gizmo. It provides a graphic visualiza- tion of the axis of rotation. If you select a dynamic UCS while using the 3DROTATE command, you have a variety of rotation axes to use because the gizmo can be located on a temporary plane. There are a few options to achieve different results when dynamically rotating an edge. The [Ctrl] key is used to access these options. First, select the edge. Then, pick the gizmo and press and release the [Ctrl] key to cycle through the options. If the [Ctrl] key is not pressed, the rotated edge maintains its length, but the shape and planes of adja- cent faces are changed. See Figure 11-25A. If the [Ctrl] key is pressed once, the length of the rotated edge is modifi ed because the planes of adjacent faces are maintained. See Figure 11-25B. If the [Ctrl] key is pressed twice, the rotated edge maintains its length, but if the rotation causes faces to become nonplanar, the adjacent faces may be triangu- lated. See Figure 11-25C. Pressing the [Ctrl] key a third time resets the function. Scaling Edges Only linear (straight-line) edges can be scaled. Circular edges, such as the ends of cylinders, can be modifi ed using grips or the SOLIDEDIT command. These tools can be used to change the diameter or establish taper angles. See Chapter 12 for a complete discussion of the SOLIDEDIT command. A B Triangular face added Triangular face added Figure 11-24. Triangulated faces are clear in plan views. A—Front plan view. B—Side plan view.