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Engineering Symbology Prints and Drawings Volume 1 of 2
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INTRODUCTION TO PRINT READING DOE-HDBK-1016/1-93 Introduction To Print Reading Drawing  Scale All drawings can be classified as either drawings with scale or those not drawn to scale. Drawings without a scale usually are intended to present only functional information about the  component  or  system.    Prints  drawn  to  scale  allow  the  figures  to  be  rendered accurately and precisely.  Scale drawings also allow components and systems that are too large to be drawn full size to be drawn in a more convenient and easy to read size.   The opposite is also true.   A very small component can be scaled up, or enlarged, so that its details can be seen when drawn on paper. Scale drawings usually present the information used to fabricate or construct a component or system.   If a drawing is drawn to scale, it can be used to obtain information such as physical dimensions, tolerances, and materials that allows the fabrication or construction of the component or system.   Every dimension of a component or system does not have to be stated in writing on the drawing because the user can actually measure the distance (e.g., the length of a part) from the drawing and divide or multiply by the stated scale to obtain the correct measurements. The scale  of a  drawing  is  usually  presented as  a ratio  and is  read as  illustrated in  the following examples. 1" = 1" Read  as  1  inch  (on  the  drawing)  equals  1  inch  (on  the  actual component or system).   This can also be stated as FULL SIZE in the  scale  block  of  the  drawing.    The  measured  distance  on  the drawing is the actual distance or size of the component. 3/8" = 1' Read  as  3/8  inch  (on  the  drawing)  equals  1  foot  (on  the  actual component or system).  This is called 3/8 scale.  For example, if a component  part  measures  6/8  inch  on  the  drawing,  the  actual component measures 2 feet. 1/2" = 1' Read  as  1/2  inch  (on  the  drawing)  equals  1  foot  (on  the  actual component or system).  This is called 1/2 scale.  For example, if a component part  measures  1-1/2 inches  on the drawing  the actual component measures 3 feet. PR-01 Rev. 0 Page 4







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