Views, ContinuedHalf sectionsCutting planes that pass halfway through an object result in a half section.The American National Standards Institute (ANSI) recommends usingcenterlines for the division line between the sectioned half and theunsectioned half of a half-section view. Notice that in fact, by using bothcenterlines you expose only one quarter of the object.Use a half-sectionview when you must show the interior of one half of the object whileretaining the exterior of the other half. This limits the useful application ofhalf-section views to symmetrically-shaped objects. Half sections are mostuseful when used in assembly drawings. Because half sections requiresymmetry and are difficult to dimension, they are not often used in detaildrawings.Figure 3-53 shows a half-section view.Figure 3-53.—A half section.Continued on next page3-58
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