Unit 8-Multi-view Drawings Vocabulary

Miter Line

A 45-degree line used to transfer measurements between the top and side views of a multi-view drawing.

Multiview Drawing

A drawing which shows two or more two-dimensional views of a three-dimensional object.

Third-Angle Projection Method

A system of projection in which the top view is projected to the horizontal plane, front view is projected to the frontal plane and right side is projected to the profile plane; universal method used in US and Canada.

Orthographic Projection

A technique that is used to create multi-view drawings by projection of the features of an object onto an imaginary plane of projection.

Central View

A view that is between two other views (the front view)

Adjacent views

A view that is next to the view you are looking at (the front and side views)

Projection Line

An imaginary line that is used to locate or project the corners, edges, and features of a three-dimensional object onto an imaginary two-dimensional surface.

Projection Plane (work plane)

An imaginary surface between the object and the observer on which a two-dimensional view of a three-dimensional object is projected and created.

Visible Line

Dark, heavy lines Show the outline and shape of an object.

Leader Line

Drawn as thin lines. Consist of an arrowhead and angled line connected to a surface. Arrowheads touch the object lines. Used to point to notes or dimensions.

Hidden Line

Light, narrow, short, dashed lines Shows the outline of a feature that can not be seen in a particular view

Break Line

Short, long or cylindrical line used to break the edge or surface of a part for clarity of a hidden surface.

Dimension Line

Terminated with arrowheads at the end. Show the length, width, and height of the features of an object

Precedence of Lines

The order in which lines are represented in a multi-view drawing. For example, object and hidden lines take precedence over all other lines.

Principal Views

The six views that are produced when an 3D object is projected onto all planes of projection.

Cutting Plane Line

Thick broken line that is terminated with short 90 degree arrowheads. Shows where a part is mentally cut in half to better see the interior detail.

Center Line

Thin line consisting of long and short dashes. Shows the center of holes, slots, paths of rotation, and symmetrical objects.

Phantom Line

Thin line made up of long dashes alternating with pairs of short dashes. -To show the alternate position of moving parts.-To show the relationship of parts that fit together.-To show repeated detail.

Extension Line

Used to show the starting and stopping points of a dimension. Must have at least a 1/16th space between it and the object .

Related views

Views that are adjacent to a central view (the top and side views)