In engineering drawings, which lines represent visible edges of an object?

Visible lines are the lines that represent the edges of an object that can be seen in the current view of an engineering drawing. They are typically drawn as solid lines and are used to outline the shape and structure of the object. These lines provide critical information regarding the dimensions and contours of the design, allowing engineers and manufacturers to understand the component's geometry effectively.

In contrast, hidden lines represent edges that are not visible from the current viewpoint, center lines indicate axes of symmetry or centers of circles, and phantom lines are used to show alternate positions or movement paths. Each of these line types serves a unique purpose within engineering drawings to convey different aspects of a design, but it is the visible lines that specifically highlight the edges that are observable.