Coordinate Systems
This coordinate system is "stationary" or "fixed", it never changes position or orientation relative to the model. What is it?
The world coordinate system (WCS)
This line represents features (edges/ contours) that can be seen in current view
Visible lines
What are the 3 aspects of a design that you can create in any CAD?
Part (solid models), assembly, and working drawing
What are 3 types of 3D coordinate systems?
Cartesian, cylindrical, and spherical
The building blocks/ elements used to create CAD models are called
Primitives
This coordinate system is defined by the designer, it may be located and orientated anywhere in any direction within the world coordinate system. What is it?
The local coordinate system (LCS)
This line represents features that cannot be seen in current view.
Hidden lines
What are the 3 roles of graphics in design?
Visualization, communication, and documentation
What are 2 types of 2D coordinate systems?
Cartesian (rectangular, orthogonal) and polar
What is the difference between conditions and constraints?
Conditions are like constraints, but they are not enforced.
How many angle(s) and distance(s) does a cylindrical coordinate have?
1 angle and 2 distances
This line represents symmetry, paths of motion, to mark the center of circles, and axes of symmetrical parts
Center lines
What 3 activities do model- centered designs focus on?
Ideation, refinement, and implementation
There are 6 types of 2D primitives name 3.
Line, Circular Arc, Circle, Rectangle, Polyline, and Polygon
What is it called when you add/ remove a feature from an existing feature?
A Boolean operation
How many angle(s) and distance(s) does a spherical coordinate have?
1 distance and 2 angles
These lines indicates the sizes of features on a drawing
Dimension and extension lines
The international design standard is called ISO (International Standards Organization) What are the 2 American design standards?
ANSI (American National Standards Institute) and ASME (American Society of Mechanical Engineers)
There are 6 different kinds of 3D primitives name 3?
Parallelepiped, sphere, cylinder, cone, space curve, and surface patch.
What is the path for a generatrix to follow to successfully generate the desired shape of a figure called?
Directrix
What kind of coordinate is it called when the coordinate values refer to a previously defined feature/ point?
Relative coordinates
Name all the lines used in sketching? (Hint there are 7)
1. Visible line 2. dimension/ extension line 3. hidden line 4. center line 5. cutting plane line 6. section line 7. break line
What are the steps to a traditional engineering design?
1. problem identification 2. preliminary ideas (brainstorming) 3. design refinement 4. analysis 5. optimization 6. documentation
What are the 4 constructive operations?
Extrude, revolve, sweep, loft
What is the generator, which on moving along a path generates new shapes or figures or solids, called?
generatrix