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A method of representing a three dimensional object
Orthographic Projection
Front view is also referred to as the
key view
Glass Box theory demonstrates what view
Third angle orthographic projection of an object suspended in a glass box
The Front, Top, Right view in third angle plane of views are referred to as
Frontal, Profile and Horizontal view
The difference between first and third angle projection
first angle- right view on left side of front view
third angle- right view on right side of front view
3d view is called pictorial view. What are 3 views
perspective
oblique
isometric
Drawing used in architecture and construction because drawing mimics the way eyes see an object.
Front view undistorted with top and right view tapering.
Perspective view
Not common in mechanical trades because of distortion to round objects.
Front face undistorted, other sides are distorted in proportion to the angle and scale.
Oblique
Common in mechanical trades for good representation of workpiece.
Front view has 30 angle front horizontal with all three axes 120 apart.
Isometric
Object or visible line
Used to show shape of an object. Should be thick and dark.
Centre line
Show a part is symmetrical.
Line is thin, broken, made of alternating long and short dashes.
Hidden line
Some features of an object are hidden.
Line is made up of a series of medium dark short dashes.
Dimension line
Used for placement of dimension.
Thin line with an arrow on each end to indicated the distance being dimensioned.
Extension line
Pair of lines extending from an object. Signify the distance that is to be dimensioned.
Leader line
Line leads from information to a particular area.
Thin line terminating with arrow, dot or tilde.
