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AUXILIARY SECTION
SECTIONING TECHNIQUES

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 5-26.-Use of an auxiliary section. Figure 5-27.-A. Multi-view view of block in normal position; B. Multi-view view of block revolved 30 degrees on axis perpendicular to vertical plane. regular  planes  of  projection.  An  auxiliary  view is one that is projected on a plane other than one of  the  regular  planes. A  rectangular  object  is  in  normal  position for  regular  multi-view  orthographic  projection when each of its faces is parallel to one regular plane  of  projection  and  perpendicular  to  the  other two.  This  is  the  case  with  the  object  shown  in figure  5-27,  view  A. USE OF REVOLUTIONS.— In a REVOLU- TION,  the  object  is  projected  on  one  or  more  of the  regular  planes  of  projection.  However,  instead of being placed in normal position, the object is revolved  on  an  axis  perpendicular  to  one  of  the regular planes. Figure 5-27, view B, is a three-view multi-view projection showing the block in 5-27, view A, as it would appear if it were revolved 30 degrees on an  axis  perpendicular  to  the  profile  plane  of projection.  Figure  5-28,  view  A,  shows  how  the Figure 5-28.-Use of revolution on axis perpendicular to (A) horizontal plane and (B) vertical plane. 5-17







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