63 terms

Ch. 10 Technical Drawing

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A(n) __ refers to the way in which something is usually done.
convection
The general term used to describe the different projected views is known as __ projection.
axonometric
Multi-view drawings are often called __ view drawings.
three
A __ is often used on outside intersecting planes by removing material at an angle to one of the planes.
chamfer
Oblique pictorials that are drawn at a __ degree angle may be sketched using isometric grid paper.
30
Team members can indicate changes by including a dated revision note on the drawing and by issuing an __ notice (ECN).
engineering change
__ lines are used to indicate an object's sizes, as well as the sizes and the locations of its features.
Dimension
Prior to the development of the computer, drawings were made on vellum using pencil and ink in a process known as __.
drafting
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
In architecture building design, most units are in __, so a scale of that unit is required to represent the building on paper.
feet
___ are explanatory notes on drawings that provide important information to the person reading the drawing.
annotations
A(n) ___ projection drawing has one face parallel to the viewing planes.
oblique
ISO standards are based on the __ systems.
metric
A(n) __ view provides a view of an object as though it were by a saw.
sectional
__ surface modeling is a technique that allows the designer to create a "skin" over a component, creating curves in almost any shape desired.
Freeform
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
There is no difference between a drawing and a projection. 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
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
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 visible lines that outline and detail an object's shape are called object lines. T or F
True
Today, many companies develop technical drawings automatically from 3D CAD models. T or F
True
Geometry concepts are rare in technical drawings. T or F
False
ANSI has established standards for technical drawings. Engineers in the United States,Canada, and several other countries follow these standards. T or F
True
What does design work require?
It requires creativity, research, trial, and error and collaboration.
What are technical drawings referred to?
Orthographic Multi-view Drawings
Orthographic Drawing
is a view looking straight down on an object
Multi-view Drawings
are three view drawings (the front, the top, and one side)
Isometric Drawing
a three dimensional view
Angles
the amount of rotation needed to bring one line of plane into coincidence with another, generally measured in radians or degrees
American Design Drafting Association
was created in 1948
Convection
the wat in which something is usually done, either by traditions or by established standards
ISO
is like the ANSI but standards are formatted in the metric system
ANSI
standardizes technical drawings
ECN
a document that accompanies a drawing or set of drawing to record or authorize changes to a design
Axonometric Projection
Originates from orthographic projection. The three types of projections are isometric, dimetric, and trimetric projection.
Isometric
is created when a figure is rotated 45 degrees
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
Cavalier Projection
uses width, height, and depth measurements
Cabinet Projection
scales the depth to one-half of the true distance
Third Angle Projection
The orthographic projection arrangement of views. Used in the United States and Canada.
Spatial Ability/Spatial Relations
being able to view from a different angle
Line Conventions
line rules
Object Lines
visible outlining lines
Construction Lines
are light weight
Hidden Lines
are dashed lines
Center Lines
clarifies the center
Extension Lines
serves for diameters
Pane Line
is located in top view
Auxiliary View
is an orthographic view that is used to show the surface
Foreshortened
when lines are shortened to give the illusion of extending or projecting into space
Projection Lines
extend out from the object ti a two dimensional viewing plane that is parallel to the respective surface
Chain Dimensioning
also known as point to point dimensioning where dimensions are established from one point to eh next
Datum Dimensioning
is a dimensioning system where each dimension originates from a common surface, plane, or axis. Also known as baseline dimensioning
Baseline Dimensioning
a system of in which all dimensions are places from a datum and not from feature to feature
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
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
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
Parameters
a quantity that is fixed for the case in question but may vary in other cases
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
Freeform Surface Modeling
a technique that allows the designer to create a "skin" over a component, creating curves in almost and shape desired