222 Exploring Drafting
10. From the lower-left corner, measure verti-
cally along the left edge of the centering
rectangle and lay out the overall height
of the object. Draw a horizontal construc-
tion line through the measured point
extending the entire width of the centering
rectangle. This is Line C in Figure 9-27E.
11. Where Line A and Line C intersect, draw
a 45° projection angle extending to the
upper-right corner of the centering rect-
angle. If the angle does not intersect these
points, check for incorrect measurements
and adjust the layout as needed.
12. Draw a construction line through the
intersection of the projection angle and
Line B. This line should also extend the
entire distance across the centering rect-
angle.
13. Measure and lay out the features of the
object. When projecting points, measure
each distance one time only and project
the distance to the adjacent view. Do not
double-measure features.
14. Complete the drawing by darkening lines.
Use the correct weight for the type of line
drawn. Recommended methods for dark-
ening lines are discussed in Chapter 5.
Multiview drawings showing 2D views are developed in CAD programs using drawing
commands and layout methods similar to those involved in manual drafting. CAD commands
are introduced in Chapter 7. When using a CAD program to generate views, points are projected
using construction lines, coordinate entry, and drawing aids such as orthogonal mode and
snap. Object features in each view are drawn with basic drawing commands. Hidden features
are drawn in the same manner using the hidden linetype.
Some CAD programs provide the ability to create multiview drawings from 3D models.
For example, it is common to orient several 2D orthographic views of a 3D drawing along with
a pictorial view, such as an isometric view. CAD-based pictorial drawing and modeling func-
tions are discussed in more detail in Chapter 13.
Please do not write in this book. Place your answers on another sheet of paper.
1. Name the six viewing directions that defi ne the principal views in a multiview drawing.
2. In orthographic projection, the _____ plane represents the projection for the top view of
the object.
3. In the _____ method of orthographic projection, an imaginary glass box containing the
object rests in the lower-right quadrant when looking at the profi le view.
4. The view in which an object feature appears in its true shape and size is the _____ view of
the feature.
5. Defi fine true face.
6. Objects that are drawn smaller than true size and shape in a view because they are not
parallel to the projection plane are said to be _____.
7. When selecting object views to be drawn, why is it recommended to use the views
showing the fewest features as hidden lines?
Creating Multiview Drawings in CAD
Test Your Knowledge