Ch. 10 Technical Drawing

Axonometric Projection

Originates from orthographic projection. The three types of projections are isometric, dimetric, and trimetric projection.

What are technical drawings referred to?

Orthographic Multi-view Drawings

Third Angle Projection

The orthographic projection arrangement of views. Used in the United States and Canada.

ANSI has established standards for technical drawings. Engineers in the United States,Canada, and several other countries follow these standards. T or F

True

In mulit-view drawings, precisions is very important, so the picture must reflect true scale and proportion of the object drawn. T or F

True

Though CAD solid modeling programs automatically generate technical drawing views, accurately communicating dimensions and tolerances is still a manuel process conducted by a designer. T or F

True

Today, many companies develop technical drawings automatically from 3D CAD models. T or F

True

the visible lines that outline and detail an object's shape are called object lines. T or F

True

Parametric Modelings

a CAD modeling method where each feature, such as a length of a side or radius of a filet, sues a parameter to define the size and geometry of that feature and to create relationships between features

Feature-Based Modelings

a characteristic of a CAD program where solid models are constructed from geometric feature, such as holes filets, shells, and lofts instead of unions mathematical geometric entities such as spheres, cylinders, and cubes

Limit Dimension

a dimension showing two dimensions stacked on top of each other. The value represents the upper dimensional limit, and the value the bottom represents the lower dimensional limit

ECN

a document that accompanies a drawing or set of drawing to record or authorize changes to a design

Parameters

a quantity that is fixed for the case in question but may vary in other cases

Baseline Dimensioning

a system of in which all dimensions are places from a datum and not from feature to feature

Freeform Surface Modeling

a technique that allows the designer to create a "skin" over a component, creating curves in almost and shape desired

Isometric Drawing

a three dimensional view

Bilateral Tolerance

a tolerance in which variation is permitted in both directions from the specified dimension

Unilateral Tolerance

a tolerance in which variation is permitted in only one direction from the specified dimension

Chain Dimensioning

also known as point to point dimensioning where dimensions are established from one point to eh next

In architecture building design, most units are in __, so a scale of that unit is required to represent the building on paper.

feet

Datum Dimensioning

is a dimensioning system where each dimension originates from a common surface, plane, or axis. Also known as baseline dimensioning

Oblique Projection Drawing

is a type of drawing involving a combination of a flat, or orthographic front lines receding lines are drawn at half scale, and usually at a 45 degrees

Orthographic Drawing

is a view looking straight down on an object

Auxiliary View

is an orthographic view that is used to show the surface

Isometric

is created when a figure is rotated 45 degrees

ISO

is like the ANSI but standards are formatted in the metric system

Pane Line

is located in top view

Line Conventions

line rules

ISO standards are based on the __ systems.

metric

A(n) ___ projection drawing has one face parallel to the viewing planes.

oblique

Cabinet Projection

scales the depth to one-half of the true distance

A(n) __ view provides a view of an object as though it were by a saw.

sectional

Extension Lines

serves for diameters

ANSI

standardizes technical drawings

Angles

the amount of rotation needed to bring one line of plane into coincidence with another, generally measured in radians or degrees

Convection

the wat in which something is usually done, either by traditions or by established standards

Multi-view drawings are often called __ view drawings.

three

Cavalier Projection

uses width, height, and depth measurements

Object Lines

visible outlining lines

American Design Drafting Association

was created in 1948

Foreshortened

when lines are shortened to give the illusion of extending or projecting into space

There is no difference between a drawing and a projection. T or F

False

Geometry concepts are rare in technical drawings. T or F

False

Oblique pictorials that are drawn at a __ degree angle may be sketched using isometric grid paper.

30

Solid modeling is a method that involves mathematically describing solely the interior of an object. T or F

False

The arrows on a cutting plane line indicate what part of the object is to be retained. T or F

False

The use of programs like AutoCAD increased the amount of time needed for engineers and draftspersons to produce engineering drawings. T or F

False

__ lines are used to indicate an object's sizes, as well as the sizes and the locations of its features.

Dimension

__ surface modeling is a technique that allows the designer to create a "skin" over a component, creating curves in almost any shape desired.

Freeform

What does design work require?

It requires creativity, research, trial, and error and collaboration.

___ are explanatory notes on drawings that provide important information to the person reading the drawing.

annotations

Hidden Lines

are dashed lines

Construction Lines

are light weight

Multi-view Drawings

are three view drawings (the front, the top, and one side)

The general term used to describe the different projected views is known as __ projection.

axonometric

Spatial Ability/Spatial Relations

being able to view from a different angle

A __ is often used on outside intersecting planes by removing material at an angle to one of the planes.

chamfer

Center Lines

clarifies the center

A(n) __ refers to the way in which something is usually done.

convection

Prior to the development of the computer, drawings were made on vellum using pencil and ink in a process known as __.

drafting

Team members can indicate changes by including a dated revision note on the drawing and by issuing an __ notice (ECN).

engineering change

Projection Lines

extend out from the object ti a two dimensional viewing plane that is parallel to the respective surface

Sketches are turned into 3D models by __, a term often used to describe a number of functions, such as extrusion, lofting, revolving, sweeping, and shelling.

features