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USE OF REVOLUTIONS
Use of partial or broken section

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 5-29.-Use of a revolved section (A-A). block  would  look  if  it  were  revolved  30  degrees on an axis perpendicular to the horizontal plane. Figure 5-28, view B, shows the block as it would appear if it were revolved 30 degrees on an axis perpendicular  to  the  vertical  plane. REVOLVED  SECTIONS.—  A common use of  the  revolution  is  the  revolved  section,  shown in figure 5-29. At the top of this figure, there is a single projection of a triangular block. You can show all required information about this block in a  two-view  projection  by  including  a  revolved  sec- tion in the front view as shown. You first assume that the block is cut by a plane perpendicular to the   longitudinal   axis. You  then  revolve  the resulting   section   90   degrees   on   an   axis   per- pendicular to the horizontal plane of projection. SECTIONING TECHNIQUES.— A  sectional view is called for when the internal structure of an object can be better shown in such a view than it can by hidden lines. In the upperpart of figure 5-30, there is a single-view projection of a pulley. The  same  object  is  shown  below  in  a  two-view multi-view  projection.  The  internal  structure  of the pulley is shown by the hidden lines in the top view. In  figure  5-31,  the  internal  structure  of  the pulley is much more clearly shown by a sectional view. Note that hidden lines behind the plane of projection  of  the  section  are  omitted  in  the Figure 5-30.-Internal structure of hidden lines. an object shown by Figure 5-31.-Internal structure of an object more clearly shown  by  sectional  view. 5-18







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