PRIN. OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 3
dimensioned in the same way that they were in the orthographic views, but
dimensions along the receding axis must be drawn in the same oblique plane as the
surface they are defining.
In the aligned system, guidelines for dimensions that define receding surfaces must
be drawn parallel to the receding axis.
Guidelines for dimensions that define
surfaces in the front view, or any surface parallel to the front view, are drawn
either horizontally or vertically depending on whether they are defining
horizontally or vertically.
In the unidirectional system, all guidelines are drawn horizontally.
In both
systems, all letters and numbers are drawn either 1/8 or 3/16 in height.
Figure 65 is an example of an oblique drawing that has been dimensioned by using
the unidirectional system.
FIGURE 65.
OBLIQUE DRAWING
DIMENSIONING USING
UNIDIRECTIONAL SYSTEM.
f. Oblique Sectional Views. Figure 66 (on the following page) illustrates a full-
oblique sectional view, and figure 67 (on the following page) illustrates a half-
oblique sectional view. Oblique sectional views are drawn in the same
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