Copyright Goodheart-Willcox Co., Inc. 144 AutoCAD and Its Applications—Advanced One cam lobe is created, but it is not in the proper position. With the left UCS current, move the cam lobe –.375 units on the Z axis. If a different UCS is current, the axis of movement will be different. This places the front surface of the cam lobe on the back surface of the fi rst bearing. Now, make a copy of the lobe that is located –.5 units on the Z axis. Finally, copy the fi rst two cam lobes –1.25 units on the Z axis. You now need to rotate the four cam lobes to their correct orientations. Make sure the left UCS is still current. Then, rotate the fi rst and third cam lobes 30°. If a different UCS is current, you can use the 3DROTATE command. The center of rotation should be the center of the shaft. There are many points on the shaft to which the Center object snap can snap they are all acceptable. You can also use the construction point as the center of rotation. Rotate the second and fourth cam lobes –30° about the same center. Finally, use the UNION command to join all objects. The fi nal object should appear as shown in Figure 6-19. Use the view cube to see all sides of the object. You can also create a rotating display using the 3DORBIT command. Multiple Intersecting Extrusions Many solid objects have complex curves and profi les. These can often be constructed from the intersection of two or more extrusions. The resulting solid is a combination of only the intersecting volumes of the extrusions. The following example shows the construction of a coat hook. 1. Construct the first profile, Figure 6-21A. 2. Construct the second profile located on a common point with the first, Figure 6-21B. 3. Construct the third profile located on the common point, Figure 6-21C. 4. Extrude each profile the required dimension into the same area. Be careful to specify positive or negative heights for each extrusion, Figures 6-21D and 6-21E. 5. Use the INTERSECT command to create a composite solid from the volume shared by the three extrusions, Figure 6-21F. INTERSECT Ribbon Home Solid Editing Solid Boolean Solid, Intersect Type INTERSECT IN