# Shared Flashcard Set

## Details

Graphics and Design Test 3
Chap 10,11,17
72
Engineering
04/08/2012

Term
 orthographic projections
Definition
 A multiview drawing is a series of 2-D ___________ representing a 3-D object.
Term
 plan and produce
Definition
 Engineers and tecnicians use multiview drawings to _____ and _______ a product.
Term
 Line of Sight and Projection plane
Definition
 Multiview drawings are created through projection theory which utilizes:
Term
 Line of Sight
Definition
 Line between observer and object
Term
 Projection plane
Definition
 Image created from LOS is projected onto user defined plane
Term
 parallel and perspective
Definition
 Two ways an image can be projected onto a plane ________ and ________
Term
 Parallel Projection
Definition
 Viewed from multiple pts at an infin. dist. Not very realistic but easier to draw Used to create multiview drawings
Term
 Perspective Projection
Definition
 Viewed from a single pt at a finite dist. Much more realistic but harder to draw
Term
 Orthographic Projection
Definition
 Utilizes parallel projection to create a projection between the observer and the object that is perpendicular to the LOS. Create 2-D views which adequately describe 3-D objects. Views are defined relative to a refernce view.
Term
 include enough views to fully describe the object. Usually 3, but can be less
Definition
 One of the fundamental rules of multiview drawings is that you must....
Term
 Frontal plane of projection Horizontal plane of projection Side or profile plane of projection
Definition
 6 Principle Views _____________( front or back) ____________(top or bottom) _____________(left or right)
Term
 mirror views
Definition
 The back, bottom, and left, are simply ________ of the front, top, and right, respectively.
Term
 Hidden lines
Definition
 _________ may be necessary to depict some of the features on the mirror image.
Term
 Frontal Plane of Projection
Definition
 The characteristic view in the multiview drawing (shows the most features). The other views selected are relative to the selected.
Term
 Z-axis
Definition
 Based on the CAD sign convention we are looking down the ________ to view the frontal plane.
Term
 Horizontal Plane of Projections x and z
Definition
 View created after the front view Viewed looking down the Y-axis (top view) Shows the objects width and depth which is the _ and _ directions in AutoCAD
Term
 Side View of Projection y and z
Definition
 Viewed looking down the X-axis  (right-side view) Shows the objects length and depth which is the __ and __ directions in AutoCAD
Term
Definition
 Traditionally the principle views have the widths aligned for the front and top views, the heights are aligned for the front and right views and the depths are aligned (via a miter line) for the top and right views. These are called _______
Term
Definition
 share one dimension (Ex. front and right side share the length dimension)
Term
 Related Views
Definition
 Views separated by two 90 degrees rotations, same distances between common features (Ex. top and right views)
Term
 Central View
Definition
 View from with the other adjacent views are aligned.
Term
 Alignment of Features
Definition
 Every point or feature in one view must be aligned on a parallel projector in any adjacent view
Term
 Distances in Related Views
Definition
 Distances between any two points of a feature in related views must be the same
Term
 True Length and Size
Definition
 Features are true length or true size when they are parallel to the projected plane
Term
 Foreshortening
Definition
 Features are foreshortened when they  are not parallel to the projection plane
Term
 Configuration of Planes
Definition
 Areas that are the same feature will always be similar in config. from 1 view to the next, unless viewed on edge
Term
 Parallel Features
Definition
 Parallel features will always appear parallel in all views
Term
 Edge Views
Definition
 Surfaces that are parallel to the lines of sight will appear as lines
Term
 Contiguous areas
Definition
 No two contiguous areas can lie in the same plane
Term
 Center lines
Definition
 mark center of circle/arc
Term
 Phantom lines
Definition
 alternate config of movable object
Term
 Break lines
Definition
 shows where object is broken to reveal interior feature, or save space
Term
 Section lines
Definition
 interior surface of cut object
Term
 Fundamental Views
Definition
 Views in a multiview drawing that show the true size of planes and edges.
Term
 edge line
Definition
 An _______ is the line at which two planes intersect. Is drawn wherever two nonparallel surfaces meet.
Term
 normal line
Definition
 A ________ is parallel to the projection plane and is thus at true size.
Term
 inclined line
Definition
 An ________ is an edge line parallel to the projection plane but not to the adjacent views, therefore adjacent views do not represent the true size of the feature.
Term
 oblique line
Definition
 An _______ is not parallel to any fo the principle views.
Term
 principle plane
Definition
 A ________ is parallel to the projection plane, therefore it is a true size feature. Will appear as a line in adjacent views. Can be categorized according to the projection plane.
Term
 inclined plane
Definition
 An _________ is perpendicular (appears as an edge) to one of the projection planes) Its true size can not be determined from the 6 principle views
Term
 oblique plane
Definition
 An ________ isnt parallel or perpendicular to any of the projection planes. Its true size can not be determined from the six principle views
Term
 points, lines, and planes.
Definition
 A 2-D multiview drawing seeks to represent a 3-D solid object through....
Term
 Points
Definition
 Represents a specific position in space. A line that is parallel to the line of sight will appear as a point on the projection plane
Term
 Planes
Definition
 Represents an area in space Will appear as a line if it is perpendicular to projection...
Term
 Planes
Definition
 Will be true size if parallel to projection..., otherwise foreshortened
Term
 true planes
Definition
 Only angles in _____ are accurate, with the exception of 90 degrees angles in foreshortened ones, containing at least one line that is true length
Term
 Curved Surfaces
Definition
 Include cones, cylinders, and spheres Only the outermost surface is shown in a multiview drawing When a circle is viewed at an angle other than parallel or perpendicular it appears as an ellipse
Term
 Fillet and Round
Definition
 Fillet is a rounded interior corner Round is a rounded exterior corner Usually doesn't change technical drawings, since they are edge on, however they may be added for a more realistic look
Term
 Holes
Definition
 Represent negative space or material removed from the object.
Term
 Runouts
Definition
 A way of representing fillets that intersect with a cylinder. Drawn at the tangent point w. a radius = to the fillet radius, and a curvature 1/8th the curvature of the cylinder
Term
 the view is edge on (perpendicular)
Definition
 A plane will retain its characteristics (number of edges, vertices, parallel sides) in orthogonal configurations unless....
Term
 Analysis by Solids
Definition
 Technique where complex objects are broken down into primitive shapes, then each is labeled and adjacent views are compared to visualize the 3-D construct.
Term
 Analysis by Surfaces
Definition
 More useful for objects with inclined or oblique features
Term
 Geometrics
Definition
 Specifying and tolerancing the shapes and locations of features on objects
Term
 Dimensioning
Definition
 Specifies the size and location of features
Term
 Tolerancing
Definition
 Control the variation in manufactured parts
Term
 Graphics, Dimensions, Notes
Definition
 A fully designed part should have three elements:
Term
 inches
Definition
 In US industry dimensions are usually specified in _______.
Term
 feet
Definition
 Parts larger than 72 inches will be specified in ______.
Term
 dimensions to features
Definition
 Extension lines connect _________ to _______ on an object.
Term
 perpendicular
Definition
 Extension lines are usually drawn _________ to the object but may be drawn at an angle if space is limited.
Term
 in the dimension they apply
Definition
 Angled extension lines must drawn....
Term
 dimension lines
Definition
 Extension lines should not cross ___________, and should avoid crossing other extension lines if possible
Term
 broken
Definition
 If an extension line crosses an arrow it should be _______
Term
 center line
Definition
 Use the ___________ as an extension line where applicable
Term
 unidirectional (left to right)
Definition
 All numerical dimensions and text should be ___________
Term
 Contour Dimensioning
Definition
 _________: objects are dimensioned in their most descriptive view
Term
 Every dimension must have an associated tolerance Do not double dimension Dimensions should be placed in a view that most clearly defines the feature being dimension
Definition
 Dimension Guidelines: 1-3
Term
 Include a visible gap between the object and extension line Avoid dimension within an object Avoid dimensioning hidden lines
Definition
 Dimensioning Guidelines: 5-7
Term
 The depth and diameter of blind, counterbored or countersunk holes may be specified in a note w/ appropiate symbol Leader lines for diameters and radii should be radial lines
Definition
 Dimensioning Guidelines: 9, 10
Term
 layer
Definition
 In AutoCAD a _______ is a group of similar objects, grouped to control their visibility. Each can be turned on and off. Unlimited number.
Term
 Color, Line-type, Line-weight, Transparency
Definition
 From the Layers Property Manager you can control the following attributes:
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