Half Section

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Section A-A in view D is known as a full section because the object is cut completely through. OFFSET  SECTION.—In this type of section, the cutting plane changes direction backward and forward (zig-zag) to pass through features that are important to show.  The  offset  cutting  plane  in  figure  3-18  is positioned  so  that  the  hole  on  the  right  side  will  be shown in section. The sectional view is the front view, and the top view shows the offset cutting plane line. HALF  SECTION.—This   type   of   section   is shown in figure 3-19. It is used when an object is symmetrical  in  both  outside  and  inside  details. One-half of the object is sectioned; the other half is shown as a standard view. The object shown in figure 3-19 is cylindrical and cut into two equal parts. Those parts are then divided equally to give you four quarters. Now remove a quar- ter. This is what the cutting plane has done in the pictorial view; a quarter of the cylinder has been re- Figure 3-18.—Offset section. Figure 3-19.—Half section. moved so you can look inside. If the cutting plane had extended along the diameter of the cylinder, you would have been looking at a full section. The cutting plane in this drawing extends the distance of the radius, or only half the distance of a full section, and is called a half section. The arrow has been inserted to show your line of sight. What you see from that point is drawn as a half section in the orthographic view. The width of the orthographic  view  represents  the  diameter  of  the circle. One radius is shown as a half section, the other as an external view. REVOLVED  SECTION.—This type of section is used to eliminate the need to draw extra views of rolled shapes, ribs, and similar forms. It is really a drawing within a drawing, and it clearly describes the object’s shape at a certain cross section. In figure 3-20, the draftsman has revolved the section view of the rib so you can look at it head on. Because of this revolving feature,  this  kind  of  section  is  called  a  revolved section. REMOVED   SECTION.—This  type  of  section  is used to illustrate particular parts of an object. It is drawn like the revolved section, except it is placed at one side to bring out important details (fig. 3-21). It is Figure 3-20.—Revolved section. Figure 3-21.—Removed section. 3-7

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