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Sketching a rectangular block
Summary - 14069_189

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 5-70.-Basic isometric forms. isometrically  for  a  model,  you  should  draw  an oblique sketch following the basic steps shown in figure  5-69,  view  B. The first step is to draw a rectangle of the front view  (using  light  lines).  Then,  second,  draw  an oblique base line at a 45-degree angle starting at the  corner  (intersection)  of  the  horizontal  and vertical  base  lines.  Third,  sketch  the  remaining horizontal and vertical lines parallel to the other base lines. Fourth, erase any unnecessary lines, and  fifth,  dimension  and  darken  the  completed drawing for easier reading. Remember, place the dimensions so they are parallel to the axis lines. The   final   step   is   to   check   the   sketch   for completeness  and  accuracy. In  the  above  procedures  for  development  of pictorial sketches, a simple rectangular form was used. All objects may be simplified to their basic geometric  forms.    These  forms  are  the  first consideration   in   the   pictorial   sketch.   Basic volumetric  forms  are  shown  in  figure  5-70.  By carefully analyzing any object you sketch, you will see one or more of the forms shown in figure 5-70. However, at times only a part of a form is present. Before attempting detailed sketches, practice sketching  the  basic  forms.  Then  look  for  these forms in the object you are about to sketch, and concentrate  on  the  basic  form  representation. Enclose   the   object   in   a   basic   form,   or   build it up with a series of different forms, depending on the nature of the object. Details are added or “carved”   from   these   forms   after   shape   and proportion  have  been  determined. Overlay  Sketches To   make   OVERLAY   SKETCHES,   sketch freehand on transparent paper placed over existing drawings or other sketches. Sometimes when you make  overlay  sketches,  you  merely  trace,  free- hand,   objects   or   lines   from   another   drawing or  sketch.  But  more  often  you  will  prepare overlay  sketches  by  tracing  and  then  adding supplementary  sketched  lines  or  objects. Usually,  when  this  type  of  sketch  is  prepared, only  the  prominent  or  desired  features  are traced.  Overlay  sketches  are  primarily  used  for planning  purposes. A  suggested  procedure  for  using  overlay sketches  as  a  tool  for  planning  is  explained  in  the following   example: The drafting room is being relocated. You are tasked with developing a proposed furniture and equipment layout. You have the latest prints of the  floor  plan  and  an  electrical  plan,  and  you 5-36







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