Copyright Goodheart-Willcox Co., Inc. Chapter 7 Sweeps and Lofts 161 to the fi rst cross section, last cross section, both fi rst and last cross sections, or all cross sections. See Figure 7-13. Select the normal setting in the drop-down list. You will have to experiment with these settings to get the desired loft shape. In manufacturing, plastic or metal parts are sometimes formed in a two-part mold. A slight angle is designed into the parts on the inside and outside surfaces to make removing the part from the mold easier. This taper is called a draft angle. The Draft angles option allows you to add a taper to the beginning and end of the loft. When setting the draft angle, you can set the angle and magnitude. See Figure 7-14. The default draft angle is 90°, which means the transition is perpendicular to the cross section. The magnitude represents the relative distance from the cross section, in the same direction as the draft angle, before the transition starts to curve toward the next cross section. Magnitude settings depend on the size of the cross sections, the draft angle values, and the distance between the cross sections. You may have to experiment with different magnitude and angle settings to get the desired loft shape. The Close surface or solid option is used to connect the last cross section to the fi rst cross section. See Figure 7-15. This option “closes” the loft, similar to the Close option of the LINE or PLINE command. The shapes from Figure 7-8 are shown in Figure 7-16 with the Close surface or solid option on. This option is only available when the Ruled or Smooth Fit option is selected. A B C D C B A Figure 7-13. The profiles in Figure 7-8A are lofted with the Normal to: option on in the Loft Settings dialog box. Cross sections were selected from bottom to top. Compare these results with Figure 7-8B and Figure 7-12. A—Start cross section. B—End cross section. C—Start and End cross sections. D—All cross sections. Figure 7-14. When setting the draft angle, you can set the angle and the magnitude. A—Draft angle of 90° and a magnitude of zero. B—Draft angle of 30° and a magnitude of 180. C—Draft angle of 60° and a magnitude of 180.