PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 5
There is no rule for the draftsman to follow concerning the use of a drawing
detail.
It is up to him to determine whether or not a drawing detail will help
clarify any particular area.
e. Drawing Scales.
Drawing scales are used because some objects are too big to
fit on a sheet of drawing paper and others are so small that they could not be seen
on a drawing.
House drawings, for example, are drawn at a reduced scale.
Electronic microcircuits are drawn at an increased scale.
Figure 95 shows one full-sized and two scaled drawings of the same square.
Note
that the scale used is clearly defined.
FIGURE 95.
AN EXAMPLE OF DRAWING
SCALES.
The scale note 1 = 2 means that every 1/2 inch on the drawing is actually 1 inch on
the object.
In other words, the drawing is one-half the size of the true object
size. Similarly, the scale note 2 = 1 means that 2 inches equal 1 inch; thus, the
drawing is twice as large as the actual object.
The note 1 = 1 means that the
drawing is the exact same size as the object.
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