Terms & Definitions

Design & Drafting TechnologyUnit 4

Arc

• Any portion of the circumference of a circle

Diameter

• The distance across a circle passing through its center point

Radius

• The distance from the center point of a circle to the outside circumference

Ellipse

• A foreshortened circle having a major axis and a minor axis

Focus (Foci)

• Point(s) at which lines come toward each other or move away from each other

Freehand Technical Sketching

• Making a drawing without the use of instruments, yet with care taken to obtain the correct line widths

Major Axis

• The axis passing through the foci of an ellipse

Minor Axis

• The chord of an ellipse passing though the center perpendicular to the major axis

Isometric Sketch

• A sketch based on the object being drawn on three axes spaced 120 apart

Oblique Sketch

• A sketch that shows the face of the object parallel with the plane of projection

Cabinet Sketch

• A sketch that shows only the face or the front of an object

Proportioning

• Drawing parts of an object in the same size relationship as the object itself