Introduction to Engineering Design - Line Conventions

Vocabulary flashcards based on the key concepts of line conventions in engineering drawings.

Object Line

Thick and dark lines that define the edges of an object.

Hidden Line

A line that shows interior details not visible from the outside of the part.

Construction Line

Lightly drawn lines used to guide drawing other shapes but are not part of the final object.

Center Line

A line that defines the center of arcs, circles, or symmetrical parts and is half as thick as an object line.

Section Line

Lines that show where material is cut away, used in Section Views.

Short-Break Line

Freehand drawn lines that show where a part is broken to reveal detail or to shorten a long part.

Dimension Line

Lines that show the length of a side with arrows indicating the starting and ending points.

Extension Line

Lines that show where a dimension starts and stops, placed slightly away from the object to avoid confusion.

Long-Break Line

Lines used to shorten very long objects, shown as a jagged cut or break.

Leader Line

Lines that show dimensions of arcs, circles, and detail.

Cutting Plane Line

Lines that show where to cut when making a section view.

Precedence of Lines

Rules that govern which lines take priority in technical drawings; object lines precede hidden and center lines.