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Drawing  an  angle  in  isometric
Diagonal Hatching in Isometric

Engineering Aid 3 - Beginning Structural engineering guide book
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measuring  distances  along  normal  lines  on  the multi-view  projection  and  laying  them  off  along the  corresponding  isometric  lines  on  the  isometric drawing. The angle that measures 40 degrees on the  top  multi-view  view  measures  only  about 32  degrees  on  the  isometric  drawing.  Note, however,  that  it  is  labeled  40  degrees  on  the isometric drawing. This is because it actually is a  40-degree  angle  as  it  would  look  on  a  surface plane  at  the  isometric  angle  of  inclination. Circles in Isometric.— A circle in a normal multi- view view will appear as an ellipse in an isometric drawing.  This  is  shown  in  figure  5-42,  view  A. A procedure that maybe used to construct an isometric circle is shown in figure 5-42, view B. The  steps  of  that  procedure  are  as  follows: 1.  Draw  the  isometric  center  lines  of  the circle.  Then,  using  those  center  lines,  lay  off  an isometric square with sides equal to the diameter of  the  circle. 2.  From  the  near  corners  of  the  box,  draw bisectors  to  the  opposite  intersections  of  the  center lines and the box. The bisectors will intersect at four  points  (A,  A´,  B,  B´),  which  will  be  the centers  of  four  circular  arcs. 3. Draw two large arcs with radius R, using Points A and A´ as centers, Draw the two smaller arcs with radius r, using Points B and B´ as centers. If  the  above  discussion  seems  familiar,  it should. It is simply an approximation of the four- point  method  you  studied  in  the  previous  chapter. However,  it  can  be  used  only  when  drawing isometric  circles  on  an  isometric  drawing. Noncircular Curves in Isometric.—  A line that appears as a noncircular curve in a normal multi- view view of an object appears as a non-isometric Figure 5-43.-Method of drawing a noncircular curve in isometric. line in an isometric drawing. To transfer such a line  to  an  isometric  drawing,  you  must  plot  a series of points by measuring along normal lines in  the  multi-view  view  and  transferring  these measurements  to  corresponding  isometric  lines  in the  isometric  drawing. The  upperpart  of  figure  5-43  shows  a  two- view   multi-view   projection   of   a   block   with Figure 5-42.-A circle on a normal multi-view view appears as an ellipse in an isometric drawing. 5-23







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