Ch. 10 Technical Drawing
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A(n) __ refers to the way in which something is usually done.
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convection
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The general term used to describe the different projected views is known as __ projection.
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axonometric
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Multi-view drawings are often called __ view drawings.
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three
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A __ is often used on outside intersecting planes by removing material at an angle to one of the planes.
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chamfer
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Oblique pictorials that are drawn at a __ degree angle may be sketched using isometric grid paper.
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30
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Team members can indicate changes by including a dated revision note on the drawing and by issuing an __ notice (ECN).
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engineering change
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__ lines are used to indicate an object's sizes, as well as the sizes and the locations of its features.
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Dimension
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Prior to the development of the computer, drawings were made on vellum using pencil and ink in a process known as __.
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drafting
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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.
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features
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In architecture building design, most units are in __, so a scale of that unit is required to represent the building on paper.
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feet
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___ are explanatory notes on drawings that provide important information to the person reading the drawing.
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annotations
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A(n) ___ projection drawing has one face parallel to the viewing planes.
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oblique
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ISO standards are based on the __ systems.
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metric
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A(n) __ view provides a view of an object as though it were by a saw.
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sectional
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__ surface modeling is a technique that allows the designer to create a "skin" over a component, creating curves in almost any shape desired.
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Freeform
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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
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True
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There is no difference between a drawing and a projection. T or F
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False
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The use of programs like AutoCAD increased the amount of time needed for engineers and draftspersons to produce engineering drawings. T or F
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False
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In mulit-view drawings, precisions is very important, so the picture must reflect true scale and proportion of the object drawn. T or F
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True
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Solid modeling is a method that involves mathematically describing solely the interior of an object. T or F
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False
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The arrows on a cutting plane line indicate what part of the object is to be retained. T or F
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False
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the visible lines that outline and detail an object's shape are called object lines. T or F
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True
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Today, many companies develop technical drawings automatically from 3D CAD models. T or F
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True
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Geometry concepts are rare in technical drawings. T or F
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False
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ANSI has established standards for technical drawings. Engineers in the United States,Canada, and several other countries follow these standards. T or F
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True
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What does design work require?
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It requires creativity, research, trial, and error and collaboration.
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What are technical drawings referred to?
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Orthographic Multi-view Drawings
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Orthographic Drawing
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is a view looking straight down on an object
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Multi-view Drawings
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are three view drawings (the front, the top, and one side)
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Isometric Drawing
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a three dimensional view
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Angles
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the amount of rotation needed to bring one line of plane into coincidence with another, generally measured in radians or degrees
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American Design Drafting Association
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was created in 1948
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Convection
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the wat in which something is usually done, either by traditions or by established standards
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ISO
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is like the ANSI but standards are formatted in the metric system
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ANSI
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standardizes technical drawings
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ECN
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a document that accompanies a drawing or set of drawing to record or authorize changes to a design
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Axonometric Projection
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Originates from orthographic projection. The three types of projections are isometric, dimetric, and trimetric projection.
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Isometric
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is created when a figure is rotated 45 degrees
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Oblique Projection Drawing
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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
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Cavalier Projection
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uses width, height, and depth measurements
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Cabinet Projection
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scales the depth to one-half of the true distance
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Third Angle Projection
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The orthographic projection arrangement of views. Used in the United States and Canada.
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Spatial Ability/Spatial Relations
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being able to view from a different angle
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Line Conventions
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line rules
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Object Lines
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visible outlining lines
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Construction Lines
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are light weight
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Hidden Lines
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are dashed lines
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Center Lines
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clarifies the center
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Extension Lines
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serves for diameters
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Pane Line
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is located in top view
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Auxiliary View
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is an orthographic view that is used to show the surface
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Foreshortened
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when lines are shortened to give the illusion of extending or projecting into space
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Projection Lines
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extend out from the object ti a two dimensional viewing plane that is parallel to the respective surface
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Chain Dimensioning
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also known as point to point dimensioning where dimensions are established from one point to eh next
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Datum Dimensioning
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is a dimensioning system where each dimension originates from a common surface, plane, or axis. Also known as baseline dimensioning
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Baseline Dimensioning
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a system of in which all dimensions are places from a datum and not from feature to feature
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Bilateral Tolerance
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a tolerance in which variation is permitted in both directions from the specified dimension
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Unilateral Tolerance
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a tolerance in which variation is permitted in only one direction from the specified dimension
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Limit Dimension
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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
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Parametric Modelings
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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
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Parameters
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a quantity that is fixed for the case in question but may vary in other cases
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Feature-Based Modelings
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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
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Freeform Surface Modeling
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a technique that allows the designer to create a "skin" over a component, creating curves in almost and shape desired
