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MECT 1330 Final Exam Study Guide
Dimensional Constraints - answer define the distance between two geometric elements geometric constraints
Geometric Constraints - answer define a relationship such as parallelism or perpendicularity between elements
Sketching - answer Transferring of ideas or concepts onto paper or into a computer to quickly capture them graphically.
Drawing - answer Transferring of an object's size, shape, proportion and/or main features onto paper or into a computer
Orthographic Projection: - answer creates a 2-D image of 3-D objects or structures on an image plane perpendicular to the lines of sight.
Axonometric Projection: - answer creates pictorial drawings of objects by rotating the object on an axis relative to a projection plane.
Oblique Drawing: - answer results when the projectors are parallel to each other but at some angle other than perpendicular to the projection plane.
Perspective Drawing: - answer A projection technique in which some or all of the projectors converge at predefined points.
Convex Hall: - answer A simple grid that is the gross outline of the object. Does not contain detail of the objects.
Conditions - answer Similar to constraints but they are not enforced, conditions are simply the geometric (or kinematic) state of a feature at a given moment or location.
3-D Primitives: - answer Objects embedded in 3-D space such as space curves surfaces, and basic solid objects.
Extrude(Linear Sweep): - answer Define the length (and direction) of the "sweep." Direction cannot be parallel to the sketch plane.
Revolve (Revolute sweep): - answer Define the axis and the amount of rotation.
Sweep (Path-based sweep): - answer Define a space curve along which the profile will be swept.
Loft (blended sweep): - answer Define space curve and intermediate profiles along the curve.
Topology: - answer The study of geometric properties and spatial relations unaffected
by the continuous change of shape or size of figures.
Parametric constraints: - answer Parametric constraints ensure that a drawing maintains its original precision by maintaining the relationships between an object and world space, between two objects, or within the object itself. (Examples: Dimensional and Geometric)
Kinematic Constraint: - answer Kinematic constraints are constraints between rigid bodies that result in the decrease of the degrees of freedom of rigid body system.
Mate: - answer Two surfaces associated with different objects are set to be coplanar with direction vectors in opposing directions.
Offset - answer Instead of the surfaces being co-planar, an offset distance is specified.
Align Axis: - answer Axes (directional vectors) are constrained to be either colinear or at specified relative angle.
Projection Theory: - answer This is the theory used to create 2-D representations (projections) of a 3-D object in a prescribed way. You can think of a projection theory as a mapping theory.
Third-Angle Projection: - answer When the projection plane is between the observer and the object.
First-Angle Projection: - answer When the object is between an observer and the projection plane.
Perspective Projections: - answer There is a finite distance, "d", between the observer and the object. The lines of sight seem emanate from the observer.
One point Perspective: - answer a drawing method that shows how things appear to get smaller as they get further away, converging towards a single 'vanishing point' on the horizon line.
Parallel Projections: - answer a projection of an object in three-dimensional space onto a fixed plane, known as the projection plane or image plane
Topology of features: - answer The topology of features is preserved in all views.
Tolerances: - answer Allowable deviation in size, location, and/or geometry of a feature.
Maximum Material Conditions(MMC): - answer Size of a feature for which there is the most material. Not always the maximum size.
Least Material Condition(LMC): - answer Size of a feature for which there is the least amount of material. Not always the minimum size.
Descriptive geometry: - answer Graphic representation of geometry used to describe 3-D features and/or solve geometric spatial problems using multiple orthographic projections in a 2-D domain.
Folding lines: - answer Represent orthogonal intersections of projection planes before "unfolding." Folding lines are between adjacent views.
Orthogonal: - answer Of or involving right angles; at right angles.
Section Views: - answer -Section views are used to clarify the interior geometry of an object that cannot be clearly seen in a "normal" multi-view drawing (even with hidden lines).
Offset Section: - answer Is used to include features not found on a single plane but on parallel planes.
Aligned Section: - answer Is used to show features not on a single cutting plane nor parallel cutting planes, but on cutting planes that intersect at one axis.
Half Section: - answer Is used to show features of ½ of the parts (usually these parts
have a circular symmetry).
Broken-out Section: - answer Is used to show only a small portion of the part's interior.
Revolved Section: - answer Is used to show the interior features of a part in one of the standard views.
Removed Section: - answer Is used to show the interior features along the length of a part at multiple section planes.
Conventions: - answer Commonly accepted practices, rules, or methods. In technical drawing, a convention is the use of dashed lines to designate a feature hidden from the current point.
Basic Dimension: - answer No size control associated with it. Geometric tolerance controls this feature.
Constraint vs. condition: - answer Similar to constraints but they are not enforced, conditions are simply the geometric (or kinematic) state of a feature at a given moment or location.
Geometric Condition: - answer -Not enforced constraints
-Geometric state of a feature at a given moment or location.
Construction Line: - answer Light,thin lines drawn to layout the framework or structure of a drawing nor sketch. Portions of these lines are often overdrawn with the final linework.
Concurrent Design: - answer The technique of organizing numerous steps so that they happen parallel (simultaneously), rather than one after another.
