Term
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Definition
| Accepted practices, rules, or methods |
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Term
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Definition
| Sets of rules that govern how technical drawings are represented |
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Term
| What organizations develop standards and conventional practices for engineering and technical graphics? |
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Definition
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Term
| What is aesthetic design? |
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Definition
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Term
| What is functional design? |
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Definition
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Term
| What are aesthetic and functional designs' roles in the product development process? |
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Definition
| Each design is a combination and compromise of the two. |
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Term
| What is the role of a production manager within the engineering design process? |
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Definition
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Term
| What is concurrent engineering design? How is it different from linear process design? |
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Definition
| Concurrent engineering design is the coordination of technical and nontechnical functions of design and manufacturing within a business. |
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Term
| What rules should one follow when creating sketches? |
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Definition
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Term
| What are the types of sketches and their use? |
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Definition
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Term
| What lead is used in sketching? |
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Definition
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Term
| What style of lettering is used? |
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Definition
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Term
| What are constraints? What is the difference between explicit and implicit constraints? |
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Definition
| Constraints are mathematical requirements placed on geometric models in a 3-D space. They differ in whether the modeling system infers the way the sketch was drawn or explicitly applies the constraint to the sketch |
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Term
| What is the difference between dimensional and geometric constraints? |
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Definition
| Dimensional = Size while Geometric = shape |
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Term
| What is a global or world coordinate system? |
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Definition
| Global = Based on default primary projection planes |
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Term
| What is a local or relative coordinate system? How are they used in the construction of constraint-based models? |
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Definition
| Local or relative = based on object geometry. They are used as a way to reference object geometry |
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Term
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Definition
| Allows a modeler to create a complex surface or object by using Boolean operations to combine objects. Critical area is where places overlap. |
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Term
| What is constraint-based modeling? |
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Definition
| A: Creating a dynamic model by having the model defined as a series of modifiable features. Each feature can be linked to other ones or made independent so they can be updated as design requirements change. |
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Term
| What are the different types of Boolean operations related to 3D modeling? |
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Definition
| Union, Difference, Intersection |
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Term
| What are the different types of sweeps that can be performed within a 3D modeler? |
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Definition
| Linear, circular, path based, blend |
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Term
| What is necessary to create a sweep? |
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Definition
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Term
| What are the different methods for defining a sweep distance? |
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Definition
| A dimension value (linear or angular), sketch, or feature edge |
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Term
| What is necessary to define a linear or radial array/pattern? A mirrored feature? |
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Definition
| Used in duplicating part features, linear array has a parent feature being copied in one or two dimensions with specifications given for distances between copies and total number of copies. Radial array, a axis of revolution is specified along with a radius, angular displacement, and total number of copies. In a mirrored feature, a mirror plane is specified along with features to be copied. |
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Term
| What are the principal planes of projection or image planes? |
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Definition
| Horizontal, Frontal, Profile |
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Term
| What are the roles of the principal planes in orthographic projection? |
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Definition
| They define the principle views: Top, Front, Right Side |
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Term
| What is the standard angle of projection in the US? |
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Definition
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Term
| Describe the locations of the planes of projection, observer, object and projection lines in 1st and 3rd angle projection |
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Definition
1st angle - observer, object, projection plane.
3rd - observer, projection plane, object |
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Term
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Definition
| A construction technique that allows projection between top and profile views? |
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Term
| What is a primary auxiliary view? |
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Definition
| Single view projected from one of six principal views. |
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Term
| Why do we use auxiliary views? |
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Definition
| To see the true size and shape of a figure. |
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Term
| What is a miter line? When would you use one? |
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Definition
| A construction technique that allows projection between top and profile views. It is used as a point of intersection for lines coming to and from the right side and top views. |
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Term
| When a hidden line and center line coincide, which one should be shown? |
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Definition
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Term
| What are the rules for the precedence of lines? |
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Definition
| Continuous line over hidden, hidden over center. |
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Term
| What criteria should be used when selecting the front view? |
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Definition
| Length and most details in front view |
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Term
| What is the difference between an isometric drawing and an isometric projection? |
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Definition
| Drawing produced using a scale of .816 is isometric projection is true representation of the object. If drawing is produced using full scale, it is called an isometric drawing. |
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Term
If you were going to layout an isometric pictorial drawing or sketch of an object that included inclined
surfaces, how would you create the inclined surfaces? |
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Definition
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Term
| What is an isometric line? |
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Definition
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Term
| What is a non-isometric line? |
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Definition
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Term
| Describe the following types of pictorials: axonometric, perspectives, and oblique |
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Definition
| Axonometric projection is parallel projection technique used to create a pictorial drawing of an object by rotating the object on an axis relative to a projection. Oblique projection is parallel projection where projectors are perpendicular to each other but not perpendicular to projection plane. In oblique only front face is seen in its true shape. Perspective projections are pictorial drawings used to represent 3-D forms on 2-D media. Such drawings create most realistic representations of objects. |
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Term
| What is the purpose of a sectional view? |
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Definition
| Clearly show internal part details |
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Term
How are the arrowheads on the cutting-plane related to the view in section? What other types of lines
are associated with sectional views? |
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Definition
| Cutting plane line, section lines, center lines, object lines |
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Term
| What are the different types of sectional views? |
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Definition
| Full, partial, half, revolved, removed, etc. |
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Term
What is an extension line? dimension line? leader line? What are the standards for the way they
appear on drawings |
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Definition
| A thin, solid line perpendicular to a dimension line that indicates which feature is associated with the dimension. A dimension line is A thin, solid line that shows the extend and direction of a dimension. A leader line is a thin solid line used to indicate the feature with which a dimension, note, or symbol is associated. Arrows are placed at the ends of dimension lines to show the limits of dimension. Arrows are usually about 3 mm long and should be one third as wide as they are long. For extension lines, there should be a visible gap of 1 mm between the feature’s corners and the end of the extension line. For the leader line, it is drawn at an angle that is terminated with an arrow touching the part or detail. |
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Term
| What is contour dimensioning? What other general rules should one follow when dimensioning an object? |
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Definition
| Contour dimensioning is when the contours or shapes of an object are dimensioned in their most descriptive view. |
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Term
| What are the different types of machined holes and how would you dimension them? |
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Definition
| Counter bore, counter sink, spot face |
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Term
| What is a drawing scale? How would you determine an appropriate drawing scale for a multiview drawing? |
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Definition
| Size of the sheet of paper vs the size of the object |
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Term
| What is a working drawing? What is included in a complete set of working drawings? |
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Definition
| Working drawings are complete set of standard drawings specifying the manufacture and assembly of a product based on its design. A complete set of working drawings includes detail drawings of each nonstandard part, an assembly drawing showing the standard and nonstandard parts in a single drawing, a bill of materials, and a title block. |
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Term
| What is a detail drawing? |
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Definition
| A detail drawing is a dimensioned, multiview drawing of a single part. |
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Term
| What is an assembly drawing? What is included in a complete set of assembly drawings? |
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Definition
| An assembly drawing shows how each part of a design is put together. An assembly drawing normally consists of all the parts, a parts list or bill of materials, leader lines with balloons, assigning each part a detail number, in sequential order and keyed to the list of parts in the parts list, and machining and assembly operations and critical dimensions related to these functions. |
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Term
| What is a Cartesian coordinate system? How are the axes related to one another? |
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Definition
| Common coordinate system in math and graphics that locates positions of geometric forms in 2-D and 3-D space. Axes are perpendicular to one another. |
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Term
What are the other types of coordinate systems? What information is necessary to define points within
each system? |
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Definition
| Polar coordinates are used to locate points in any plane. They specify a distance and an angle from the origin. Cylindrical coordinates involve one angle and two distances. Spherical coordinates involve two angles and one distance. World coordinate system is reference system where geometry is defined and stored. It uses a set of three numbers located on 3 perpendicular axes and measured from origin. Local coordinate system is a moving system that can be positioned anywhere in 3-D space by the user to assist in construction of geometry. |
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Term
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Definition
| Distance all the way around a circle |
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Term
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Definition
| Chord that passes through the center. Twice the radius |
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Term
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Definition
| Line joining the center to any point on the circumference. |
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Term
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Definition
| A straight line joining any two points on the circumference |
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Term
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Definition
| Arc measuring at least one half the circumference of the circle. |
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Term
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Definition
| Arc measuring less than a semicircle |
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Term
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Definition
| Describes the strength of a relationship between components. Less degrees means more of an established geometric relationship. |
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Term
| Parent-Child Relationships |
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Definition
| Child feature is dependent on existence of parent feature. |
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Term
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Definition
| Components are brought together to define a larger, more complex product representation |
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Term
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Definition
| Consists of information about what is on the inside of a 3-D model as well as information about the surface of an object. |
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Term
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Definition
| Models that unambiguously separate a region into the inside and outside. Solid models are restricted to manifold models. |
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Term
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Definition
| Models that are described using basic geometric forms. |
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Term
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Definition
| Term used to describe physical portions of a part. Examples are hole, slot, stud, or surface. |
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Term
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Definition
| Computer interface that is common to most constraint-based modelers. It lists the geometric features in the order in which they are interpreted by the modeler. |
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Term
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Definition
| Any geometry created as part of the CAD modeling process that does not represent actual part geometry. Examples are workplanes, axes, or points used to locate geometry in a solid model. |
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Term
| Unidirectional associativity |
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Definition
| The supporting application’s data can be altered by changing the 3-D model but not vice versa. The supporting application’s data can be altered by changing the 3-D model but not vice versa. |
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Term
| Bidirectional associativity |
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Definition
| Changes in either 3-D modeling data or supporting application will affect the other. |
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Term
What is the difference between convergent and parallel projection? List some different types under
each category. |
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Definition
| Parallel projection requires that the object be positioned at infinity and viewed from multiple points on an imaginary line parallel to the object. Convergent requires that the object be positioned a finite distance and viewed from a single point. Orthographic project is parallel projection where the plane of projection is positioned between the observer and the object and is perpendicular to the parallel lines of sight. |
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Term
| Distinguish the difference between height, width and depth auxiliaries. |
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Definition
| Height auxiliary view is projected from top view. Width from profile view. Depth from front view. |
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Term
| Describe the following types of pictorials: axonometric, perspectives, and oblique. |
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Definition
| Axonometric projection is parallel projection technique used to create a pictorial drawing of an object by rotating the object on an axis relative to a projection. Oblique projection is parallel projection where projectors are perpendicular to each other but not perpendicular to projection plane. In oblique only front face is seen in its true shape. Perspective projections are pictorial drawings used to represent 3-D forms on 2-D media. Such drawings create most realistic representations of objects. |
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