Term
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Definition
| A multiview drawing is a series of 2-D ___________ representing a 3-D object. |
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Term
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Definition
| Engineers and tecnicians use multiview drawings to _____ and _______ a product. |
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Term
| Line of Sight and Projection plane |
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Definition
| Multiview drawings are created through projection theory which utilizes: |
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Definition
| Line between observer and object |
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Definition
| Image created from LOS is projected onto user defined plane |
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Definition
| Two ways an image can be projected onto a plane ________ and ________ |
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Definition
- Viewed from multiple pts at an infin. dist.
- Not very realistic but easier to draw
- Used to create multiview drawings
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Definition
- Viewed from a single pt at a finite dist.
- Much more realistic but harder to draw
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Term
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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. |
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Term
| include enough views to fully describe the object. Usually 3, but can be less |
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Definition
| One of the fundamental rules of multiview drawings is that you must.... |
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Term
Frontal plane of projection
Horizontal plane of projection
Side or profile plane of projection |
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Definition
6 Principle Views
_____________( front or back)
____________(top or bottom)
_____________(left or right) |
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Term
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Definition
| The back, bottom, and left, are simply ________ of the front, top, and right, respectively. |
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Term
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Definition
| _________ may be necessary to depict some of the features on the mirror image. |
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| Frontal Plane of Projection |
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Definition
| The characteristic view in the multiview drawing (shows the most features). The other views selected are relative to the selected. |
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Term
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Definition
| Based on the CAD sign convention we are looking down the ________ to view the frontal plane. |
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Term
Horizontal Plane of Projections
x and z |
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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
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Term
Side View of Projection
y and z |
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Definition
- Viewed looking down the X-axis (right-side view)
- Shows the objects length and depth which is the __ and __ directions in AutoCAD
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Term
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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 _______ |
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Term
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Definition
| share one dimension (Ex. front and right side share the length dimension) |
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Term
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Definition
| Views separated by two 90 degrees rotations, same distances between common features (Ex. top and right views) |
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Definition
| View from with the other adjacent views are aligned. |
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Term
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Definition
| Every point or feature in one view must be aligned on a parallel projector in any adjacent view |
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Term
| Distances in Related Views |
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Definition
| Distances between any two points of a feature in related views must be the same |
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Term
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Definition
| Features are true length or true size when they are parallel to the projected plane |
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Term
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Definition
| Features are foreshortened when they are not parallel to the projection plane |
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Definition
| Areas that are the same feature will always be similar in config. from 1 view to the next, unless viewed on edge |
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Definition
| Parallel features will always appear parallel in all views |
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Term
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Definition
| Surfaces that are parallel to the lines of sight will appear as lines |
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Definition
| No two contiguous areas can lie in the same plane |
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Definition
| mark center of circle/arc |
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Definition
| alternate config of movable object |
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Definition
| shows where object is broken to reveal interior feature, or save space |
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Definition
| interior surface of cut object |
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Definition
| Views in a multiview drawing that show the true size of planes and edges. |
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Term
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Definition
| An _______ is the line at which two planes intersect. Is drawn wherever two nonparallel surfaces meet. |
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Term
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Definition
| A ________ is parallel to the projection plane and is thus at true size. |
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Term
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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. |
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Definition
| An _______ is not parallel to any fo the principle views. |
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Term
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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. |
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Term
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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 |
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Term
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Definition
| An ________ isnt parallel or perpendicular to any of the projection planes. Its true size can not be determined from the six principle views |
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Term
| points, lines, and planes. |
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Definition
| A 2-D multiview drawing seeks to represent a 3-D solid object through.... |
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Term
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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
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Term
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Definition
- Represents an area in space
- Will appear as a line if it is perpendicular to projection...
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Definition
- Will be true size if parallel to projection..., otherwise foreshortened
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Term
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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 |
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Term
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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
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Term
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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
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Term
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Definition
| Represent negative space or material removed from the object. |
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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 |
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Term
| the view is edge on (perpendicular) |
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Definition
| A plane will retain its characteristics (number of edges, vertices, parallel sides) in orthogonal configurations unless.... |
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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. |
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Definition
| More useful for objects with inclined or oblique features |
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Definition
| Specifying and tolerancing the shapes and locations of features on objects |
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Definition
| Specifies the size and location of features |
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Definition
| Control the variation in manufactured parts |
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| Graphics, Dimensions, Notes |
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Definition
| A fully designed part should have three elements: |
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Definition
| In US industry dimensions are usually specified in _______. |
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Term
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Definition
| Parts larger than 72 inches will be specified in ______. |
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Term
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Definition
| Extension lines connect _________ to _______ on an object. |
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Term
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Definition
| Extension lines are usually drawn _________ to the object but may be drawn at an angle if space is limited. |
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| in the dimension they apply |
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Definition
| Angled extension lines must drawn.... |
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Term
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Definition
| Extension lines should not cross ___________, and should avoid crossing other extension lines if possible |
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Term
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Definition
| If an extension line crosses an arrow it should be _______ |
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Term
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Definition
| Use the ___________ as an extension line where applicable |
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Term
| unidirectional (left to right) |
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Definition
| All numerical dimensions and text should be ___________ |
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Term
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Definition
| _________: objects are dimensioned in their most descriptive view |
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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
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Definition
| Dimension Guidelines: 1-3 |
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Term
- Include a visible gap between the object and extension line
- Avoid dimension within an object
- Avoid dimensioning hidden lines
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Definition
| Dimensioning Guidelines: 5-7 |
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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
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Definition
| Dimensioning Guidelines: 9, 10 |
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Term
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Definition
| In AutoCAD a _______ is a group of similar objects, grouped to control their visibility. Each can be turned on and off. Unlimited number. |
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Term
| Color, Line-type, Line-weight, Transparency |
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Definition
| From the Layers Property Manager you can control the following attributes: |
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