What is the primary function of sectional views in engineering drawings?

The primary function of sectional views in engineering drawings is to illustrate how parts fit together internally. Sectional views provide a view of the internal features of a component by creating an imaginary cut through the object, allowing the designer to show details that are not visible from the exterior. This is particularly important in complex assemblies where understanding the spatial relationship and arrangement of internal components is crucial for assembling, maintaining, or manufacturing the object.

In contrast to exterior views, which may show overall aesthetics or surface details, and dimensional drawings, which focus on size and measurements, sectional views serve to highlight components' interaction and the mechanics of their assembly. For example, when assessing a mechanical part, a sectional view can reveal the arrangement of gears and how they fit together, providing a more comprehensive understanding than a standard exterior view alone. This makes sectional views an essential tool in engineering design and documentation.