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ORDER  OF  DRAWINGS
Units of Measure

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure 10-2.-A title block showing a drawing number assigned by NAVFACENGCOM. (Figure 10-2 is an example of a local activity, such as the  Civil  Engineering  Support  Office  (CESO),  using  a drawing number assigned by the Western (WESTDIV).) Figure  10-2.A  title  block  showing  a number  assigned  by  NAVFACENGCOM. You may not use a NAVFACENGCOM Division drawing assigned number for any other drawing, even though the drawing to  which  it  has  been  assigned  is  not  being  used. Sometimes,  because  of  extensive  revision  on  a particular  drawing,  it  becomes  necessary  to  prepare  a new drawing and to assign a new NAVFACENGCOM drawing number. A cross-reference note to be placed directly above or adjacent to the title block is shown below. Old Drawing Note: THIS  DRAWING  SUPER- SEDED  BY  DRAWING NO. Drawing  Revisions New Drawing Note: THIS  DRAWING  SUPER- SEDES  DRAWING NO. Revisions  to  NAVFACENGCOM  project  drawings are  to  be  made  according  to  DOD-STD-100C.  The revision block may include a separate “PREPARED BY” column to indicate the organization, such as an A/E firm, that prepared the revision. The layout of the modified revision block is to be as shown in chapter 3, figure 3-22, views A and B. Graphic  Scales Graphic scales are located in the lower right-hand corner of each drawing sheet, with the words Graphic Scales directly over them. The correct graphic scales must be shown prominently on each drawing because, as drawings are reduced in size, the reductions are often NOT to scaled proportions. Line  Conventions  and  Lettering You  should  pay  close  attention  to  the  opaqueness and uniform weight of lines. To provide contrasting division and use of thick and thin lines, refer to chapter 3, figure 3-23, and ANSI Y14.2M, Line  Conventions and  Lettering,  Engineering  Drawing  and  Related Documentation  Practices.  Uppercase  lettering  is  to  be used  except  for  notes  on  maps  and  similar  drawings, where lowercase lettering may be used. The minimum allowable height of freehand letters is 5/32 (0.156) in., and of mechanical or computer graphics is 0.150 in. For abbreviations  on  drawings,  use  MIL-STD-12, Abbreviations. DIMENSIONING  AND  TOLERANCING All  dimensions  and  tolerances  are  to  clearly  define engineering intent and be prepared according to ANSI Y14.5M,  Dimensioning   and   Tolerancing   for Engineering Drawings. Some of the fundamental rules that  apply  to  dimensioning  and  tolerancing  drawings are as follows: 1. A dimension having a tolerance may have it applied directly to the dimension or indicated by a general note on the drawing sheet. 2.  Dimensioning  for  size,  form,  and  location  of features   are   to   be   complete;   however,   no   more dimensions   than   those   necessary   for   complete definition should be given. Neither the use of “sealing” (measuring  the  size  of  a  feature  directly  from  an engineering drawing) nor assumption of a distance or size is permitted. The use of a reference dimension on a drawing should also be minimized. 3.  Dimensions  should  be  arranged  to  provide optimum   readability   to   obtain   required 10-6







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