In technical drawings, which line type helps indicate the boundary of an object?

In technical drawings, the line type that indicates the boundary of an object is known as object lines. Object lines are typically drawn as solid, thick lines, which make them the most distinct among other line types used in drafting. Their primary purpose is to clearly define the edges and solid features of a part, making it easy for viewers to understand the shape and form of the object being represented.

Hidden lines, on the other hand, depict edges that are not visible from the current vantage point; they are dashed lines and serve a distinct purpose of indicating features that cannot be directly seen. Dimension lines provide information about the size of the object, such as length and width, and they are usually accompanied by numerical values that specify these dimensions. Extension lines are used to extend certain features, indicating where dimensions start and end, but do not themselves define the boundaries of the object.

Understanding object lines is critical in technical drawing as they ensure clarity in communicating designs and ideas in engineering and manufacturing contexts.