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