ENG 004 UC DAVIS

Z.

Boolean Operations

Simple additive, subtractive, and intersection operations.

Concurrent Design

steps of the design process that occur in parallel with one another, in particular
ideation, refinement, and implementation

Contour Sketching

sketching the outline of an object

Construction Line

lines used to assist in creating a drawing

World Coordinate System

fixed coordinate system also called global coordinate system

Local Coordinate System

a transient coordinate system chosen by the designer which can be
positioned anywhere in space.

Primitive

a fundamental geometric object used to create a solid model

Constructive Solid Geometry

a method of 3D solid modeling that uses Boolean operations and
constructive operations

Draw the old model of the design process

Draw the concurrent model of the design process

Draw the ETC model

Draw the ARC model

Draw 3 pillars diagram

Sustainable design guidelines/principles

1. Low impact materials
2. Better to prevent waste than to clean in up
3. Design for separation
4. Max. efficiency
5. "output pull" not "input push"
6. conserve complexity
7. Design for durability, not immortality
8. Unnecessary capability is a design flaw
9. Minimize material diversity
10. Include integration & interconnectivity of energy & material flows
11. Design for end of life (EOL)
12. Materials should be renewable
13. Reframe the problem

Draw product life

cycle diagram

Visual Thinking

Sketching

transferring ideas or concepts onto paper or into the computer to capture graphically

Drawing

Transferring of an objects size, shape, proportion, and/or main features onto paper or onto a computer

Role of graphics in design

Hidden lines

represent features, cannot be seen in current view

Dimension line

Indicates the size of features in a drawing

center line

represents symmetry, paths of motion, centers of circles, axes of symmetrical parts

phantom line

shows relative or range of motion of a part

visible line

Represents features (edges/contours) seen in the current view

section line

represent surface cut by plane

Breaklines

shows where object is broken to save space or reveal an internal feature

ANSI standards

American National Standards Institute

ISO standards

International Standards Organization

Absolute Coordinates

Coordinate distances measured from the origin

Relative Coordinates

coordinate values that refer back to the previously defined feature

constraints

conditions

similar to constraints but they are not enforced

Constructive operations

Draw feature planning diagram

Projection theory

Used to create 2

Third

angle projection

First

angle projection

Multiview Drawing

Are created by multiple orthographic projections on projection planes that are that are perpendicular to one another

True

size

Edge

View

Foreshortened View

Parallel Features

Parallel features remain parallel in all views.

Topology of Features

The topology of features is preserved in all views.

Dimensioning Guidelines

Allowance

The tightest possible fit between two mating parts (minimum clearance). MMCh

Clearance

Loosest fit intended b/t mating parts (maximum clearance). LMCh

Transition fit

Can sometimes have a clearance fit and sometimes have an interference fit (one negative one positive)

Interference Fit

Limits the size of mating parts so that an interference always results when mating parts are assembled (parts must be forced together). (both negative)

Force Fit

Min. Interference: LMCs

Maximum Material Condition (MMC)

The largest size limit of an external feature and the smallest size limit of an internal feature.

Least Material Condition (LMC)

The smallest size limit of an external feature and the largest size limit of an internal feature.

Geometric Dimensioning and Tolerancing (GD&T)

A 3

Descriptive Geometry

A graphic representation of geometry used to describe 3D features and/or solve geometric spatial problems using multiple orthographic projections in a 2D domain.

Folding lines

Represent orthogonal intersections of projection planes before "unfolding." Folding lines are between adjacent views.

Auxiliary View

These are orthographic projections used to obtain a true

Section View

Used to show "inside" details not apparent on the exterior of the part.

Feature Control Frame

A symbolic means of expressing the type of control on a feature, and defining a tolerance zone for that control.

MMCh > LMCs: clearance
MMCs > LMCh: interference