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annotate
To add explanatory notes to a drawing

assembly
A group of machined or handmade parts that fit together to form a selfcontained unit

assembly drawing
A drawing that shows parts of an item when assembled

Cartesian coordinate system
A rectangular coordinate system creatd by three mutually perpendicular coordinate axes, commonly labeled X, Y, and Z

component
A part or element of a larger whole

computeraided design or computeraided drafting (CAD)
 1. When used in the context of design: the use of a computer to assist in the process of designating a part, circuit, building, etc.
 2. When used in the context of drafting: the use of a computer to assist in the process of creating, storing, retrieving, modifying, plotting, and communicating a technical drawing

degree of freedom
The variables by which an object can move. In assemblies, an object floating free in space with no constraints to another object can be moved along three axes of translation and around three axes of rotation. Such a body is said to have six degrees of freedom

design brief
A written plan that identifies a problem to be solved, its criteria, and its constraints. The design brief is used to encourage thinking of all aspects of a problem before attempting a solution

design statement
A part of a design brief that challenges the designer, describes what a design solution should do without describing how to solve the problem, and identifies the degree to which the solution must be executed

domain
The set of input values of a function

extrusion
 1. A manufacturing process that forces material through a shaped opening
 2. A modeling process that creates a threedimensional form by defining a closed twodimensional shape and a length

function
 1. A relationship from one set (called the domain) to another set (called the range) that assigns to each element of the domain exactly one element of the range
 2. The action or actions that an item is designed to perform

geometric constraint
Constant, nonnumerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity

marketing
The promotion and selling of products or services

mathematical modeling
The process of choosing and using appropriate mathematics and statistics to analyze empirical situations, to understand them better, and to improve decisions

mockup
A model or replica of a machine or structure for instructional or experimental purposes. Also referred to as an Appearance Model

model
A visual, mathematical, or threedimensioanl representation in detail of an object or design, often smaller than the original

origin
A fixed point from which coordinates are measured

packaging
Materials used to wrap or protect goods

pattern
A repeated decorative design

physical model
A physical representation of an object. Prototypes and appearance models are physical models

plane
A flat surface on which a straight line joining any two points would wholly lie

prototype
A fullscale working model used to test and improve a design concept by making actual observations and necessary adjustments

range
The set of output values of a function

revolution
Creating a 3D solid or surface by revolving a 2D shape about an axis

rotation
Turning around an axis or center point

round
A rounded exterior blend between two surfaces

scale model
An enlarged or reduced representation of an object that is usually intended for study purposes

scoring
Making an impression or crease in a box blank to facilitate bending, folding, or tearing

solid
A threedimensional body or geometric figure

solid modeling
A type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces

subassembly
An assembled part that is part of a larger assembly

translation
Motion in which all particles of a body move with the same velocity along parallel paths

working drawings
Drawings that convey all of the information needed to manufacture and assemble a design

