Orthographic Drawing
Multiview Projection Projection a view of an object Is a photograph enough to describe an object? A number of views, systematically arranged...
Perspective Projection Source, at a definite distance.
Orthographic Drawing Source, at an infinite distance
Four Types of Projection
Six Standard Views TOP REAR RIGHT LEFT FRONT BOTTOM
Six Standard Views
Six Standard Views
Orthographic Drawing
Orthographic Drawing
Orthographic Drawing
Unfolding the Glass Box
Top & Right Side Views
Third Angle Projection A transparent picture plane is set up between object and the station point of an observer’s eye. T F R Mitter Line D/2
Mitter line can only be used when the views are placed equidistantly. Third Angle Projection Mitter line can only be used when the views are placed equidistantly. ?????
The observer looks through the object to the planes of projection. First Angle Projection (Europe & Asia) R F The observer looks through the object to the planes of projection. D/2 D/2 D/2 D/2 Mitter Line T
bounded by straight lines, or curves. Views of Surfaces To effectively create and interpret multiview projections, you have to consider the elements that make up most solids: SURFACES bounded by straight lines, or curves.
Edge View
True View
Foreshortened View
Parallel to the plane of projection (true shape&size) Normal Surface Parallel to the plane of projection (true shape&size)
Perpendicular to a plane, but inclined or tipped to adjacent planes Perpendicular to a plane, but inclined or tipped to adjacent planes. Edge vien on perp. Plane, fs view on inclined planes Inclined Surface
Oblique Surface Tipped to all planes. FS on all planes.
True length in adjacent planes Point on perpendicular Plane. Normal Edge
Inclined Edge True length in parallel plane (angled) Shortened on adjacent planes (vertical / horizontal) Inclined Edge
Shortened & Angled Shortened & Angled Oblique Edge
Angles
A corner or point, intersection of 3 planes Vertices A corner or point, intersection of 3 planes
Meaning of a Point A vertex Point view of an edge
An edge (intersection between 2 surfaces) Edge view of a surface Meaning of a Line Visible or hidden: An edge (intersection between 2 surfaces) Edge view of a surface Limiting element of a curved surface
Hidden Lines Dashed hidden lines are used to represent features that would be hidden behind other surfaces.
Used to indicate symmetrical axes of circles Center Lines Used to indicate symmetrical axes of circles
Start details and arcs first Draw dominant details Check your views Order of Drawing Block out the views Locate centerlines Start details and arcs first Draw dominant details Check your views
Now : Guess the object....
So the Quiz Object....
Guess the object....
The object .... Is a rectangular prism
Guess the object....
The object ... Is a cylindrical prism
Third Angle Projection...
So The Object...
THAT’S IT FOR TODAY! ...