510 Chapter 16 Engineering Drawings and Symbols
■Figure 16.4 Examples of objects requiring one or two views.
To p
Front Right
■Figure 16.3
The top, front, and the right-side views of an object.projection contains the limits of the hole within the object. The right-side projection of the
object also contains the intersection of two planes that are located on the object. Therefore, the
solid and dashed lines are used to show these edges and limits. The third type of line that is
employed in orthographic projections is the centerline, or the line of symmetry, which shows
where the center of holes or the center of cylinders are. Pay close attention to the difference in
the line patterns between a dashed line and a centerline. Examples of solid lines, dashed lines, and
lines of symmetry are shown in Figure 16.3.
As we said earlier, the number of views that you should draw to represent an object will
depend on how complex the object is. For example, if you want to show a bolt washer or a gas-
ket, you need to draw only a single top view and specify the thickness of the washer or the
gasket. For other objects, such as bolts, we may draw only two views. Examples of objects
requiring one or two views are shown in Figure 16.4.62080_16_ch16_p504-549.qxd 5/22/10 12:31 AM Page 510
Copyright 2010 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s).圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀圀圀圀⸀夀䄀娀䐀䄀一倀刀䔀匀匀⸀䌀伀䴀