Chapter 7 - Review

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A computer hardware device used to convert a hard copy image into digital form.

Cartesian coordinate system

A system in which coordinates are located along the X axis (horizontal axis), Y axis (vertical axis), and Z axis (the axis projecting perpendicular from the XY plane).

Bill of materials

A table that lists all the information about the parts and materials needed to manufacture a part or assembly.

Resolution

A term used to describe the visual quality of a raster image, determined by the number of pixels making up the image.

Solid modeling

A type of 3D CAD modeling used to create solids (objects that represent the entire mass of an object).

Surface modeling

A type of 3D CAD modeling used to create surface models.

Surface model

A type of CAD model that has an outer "skin" to represent exterior surfaces.

Solid model

A type of CAD model that represents the entire mass of an object and is considered to be created from the actual material making up the object.

Computer-aided design/Computer-aided manufacturing (CAD/CAM)

A type of manufacturing in which machining data is generated from CAD drawings and used by computer numerical control (CNC) machines.

Feature-based modeling

A type of modeling in which features make up the basic building blocks of a part and are constructed using sketches or other modeling methods.

Assembly

A unit fitted together from manufactured parts.

Subassembly

A unit of parts that must be assembled together before being added to a larger assembly.

Parametric modeling

An advanced form of 3D modeling in which the model dimensions, or parameters, are defined and modified as needed throughout the modeling process.

Chamfer

An angled cut made to remove the "corner" of two perpendicular surfaces.

Fillet

An arc representing an inside rounded corner.

Round

An arc representing an outside rounded corner.

Template

In CAD drafting, a file with standard user settings used to start a drawing file.

Symbol library

In a CAD system, a collection of related drawing symbols.

Direct distance entry

In a CAD system, a drawing aid used to specify accurate distances when drawing lines by moving the mouse in the desired direction and entering a measurement value.

Orthogonal mode

In a CAD system, a drawing mode used to draw straight lines by confining the cursor to horizontal and vertical movement.

Object snap

In a CAD system, a function that allows the cursor to be aligned, or snapped to specific locations on an object.

Snap

In a CAD system, a function that allows the user to align or "snap" the cursor to specific increments in an invisible grid.

Rendering

In a CAD system, a highly realistic representation of a model with lighting, shadows, and other visual effects applied.

Scene

In a CAD system, a model set up for rendering with the appropriate lighting and materials.

Grid

In a CAD system, a network of uniformly spaced points used to determine distances.

Hatch pattern

In a CAD system, a predefined pattern used to represent a material or a special graphic symbol.

World coordinate system

In a CAD system, a system for locating points using Cartesian coordinates on the XYZ axes in relation to the 0,0,0 origin.

User coordinate system

In a CAD system, a user-defined coordinate system with an orientation different from that of the world coordinate system.

Linetype

In a CAD system, a user-defined object setting used to describe a line definition in the Alphabet of Lines

Array

In a CAD system, an orientation of copied objects in a rectangular or polar pattern.

Polar coordinates

In a CAD system, coordinates located at a given distance and angle.

Relative coordinates

In a CAD system, coordinates located in relation to the last coordinate specified (or the origin, if a previous point has not been specified).

Absolute coordinates

In a CAD system, coordinates located in relation to the world coordinate system origin.

Layers

In a CAD system, groupings of objects that can be thought of as a system of "overlays" similar to the drawing sheets used in manual drafting.

Blocks

In a CAD system, objects designed for multiple use.

Attributes

In a CAD system, text strings of information about related symbols such as product numbers, sizes, or materials.

Vector objects

In computer drawing, objects made up of lines and arcs, defined with point coordinates in space.

Raster objects

In computer drawing, objects made up of pixels - also known as bitmap graphics.

Pixels

In computer drawings, tiny shapes of data making up a raster image.

Sketch

In parametric modeling, a 2D profile used to create a feature of a part.

Part

In parametric modeling, a 3D model constructed to represent a mechanical component

Geometric constraint

In parametric modeling, a condition that controls a geometric relationship between objects.

Reference plane

In parametric modeling, a user-created construction plane.

Reference dimensions

In parametric modeling, dimensions in a drawing file that are created manually by the user. A.k.a., drawing dimensions.

Model dimensions

In parametric modeling, dimensions in a drawing file that control the model geometry when edited.

Parameters

In parametric modeling, dimensions that control the size and location of geometric features.

Base feature

In parametric modeling, the feature that defines the most basic shape or contour of a part model.

Base view

In parametric modeling, the first view inserted into a layout when creating a drawing.

Schedule

On a mechanical drawing, a chart or table used to list manufacturing and purchasing information about parts and products.

Degrees of freedom (DOF)

The freedom of movement or rotation of a part. Each part has 3 degrees of linear movement along the X, Y, and Z axes and 3 degrees of rotary motion about the X, Y, and Z axes.

Coordinates

The positions or locations of points on the X, Y, and Z planes. In a CAD system, the points represent units of real measurement from a fixed point.