Lines and Faces MCHE

-A zero dimension entity

-Used to indicate locations in space and considered to have no width, height or depth

• Point

• Hidden Line

• Construction Line

• Line

-The shortest distance between two points and considered to have a length but no other dimension

-used in drawings to represent the edge view of a surface, limit a contour, or edge where two surfaces of an object join

-In CAD, typically stored by coordinate points (x,y)

• Point

• Hidden line

• Construction Line

• Line

-Set of points that are equidistant from a center point

-Distance from center to one of the points is the radius

- Distance across the center to any two points on opposite sides is the diameter

-Circumference contains 360 degrees of arc

• Point

• Line

• Circle

• Arc

________ are useful when wanting to create an organic shape

• Points

• Arcs

• Circles

• Tangents

-Portion of a circle that can be defined by specifying:

-Endpoints and one other point on an arc

-Center, radius, and angle measure

-Center, radius, and arc length

-Center radius, radius, chord length

-Endpoints and radius

-Endpoints and arc length

-Endpoints and Chord length

• Arc

• Circle

• Tangent

• Construction Line

Can be defined by describing:

-Two parallel lines

-Three points not lying in a straight line

-A point and a line

-Two intersecting lines

• Standard Views

• Lines

• Parallel Lines

• Planes

When constructing on an orthographic projection (normal projection), the number of views are those necessary to completely characterize the part (dimensions, locations)

-Complex parts= more views

-simple parts= less views

• Planes

• Dimensions

• Standard Views

• Opposing Views

What are the Standard Views for Orthographic projections?

• Rear

• Right Side

• Top

• Bottom

• Front

What are the opposite sides of the standard views?

• Top

• Rear

• Left side

• Right Side

• Bottom

When presented with a 3D object, the _______ is a choice you make

• Right side view

• Front view

• Center view

• Top view