What does a cutting plane line indicate?

A cutting plane line is a crucial element in technical drawings and engineering diagrams. It represents the location of an imaginary section plane that would cut through the object to reveal internal features. This line helps communicate to the viewer where the object would be 'sliced' to show hidden details that are not visible from the exterior view.

Using a cutting plane line enables engineers and designers to visualize and understand complex internal structures or components, providing a cross-sectional view that aids in analysis, fabrication, and inspection. Such visualizations are essential for conveying the design accurately to manufacturers or stakeholders involved in a project.