Orthographic Drawing
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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.

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Multiview projection
Multiview Projection

  • Projection  a view of an object

  • Is a photograph enough to describe an object?

  • A number of views, systematically arranged...


Perspective projection
Perspective Projection

Source, at a definite distance.


Orthographic Drawing

Source, at an infinite distance



Six Standard Views

TOP

REAR

RIGHT

LEFT

FRONT

BOTTOM









Third Angle Projection

T

Mitter Line

D/2

D/2

D/2

D/2

F

R

A transparent picture plane is set up between object and the station point of an observer’s eye.


Third Angle Projection

Mitter line can only be used when the views are placed equidistantly.

?????


First Angle Projection (Europe & Asia)

Mitter Line

R

F

The observer looks through the object to the planes of projection.

D/2

D/2

D/2

D/2

T


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.





Normal Surface

Parallel to the plane of projection (true shape&size)


Perpendicular to a plane, but inclined or tipped to adjacent planes. Edge vien on perp. Plane, fs view on inclined planes

Inclined Surface


Tipped to all planes. planes. Edge vien on perp. Plane, fs view on inclined planes

FS on all planes.

Oblique Surface


True length in adjacent planes planes. Edge vien on perp. Plane, fs view on inclined planes

Point on perpendicular Plane.

Normal Edge


True length in parallel plane planes. Edge vien on perp. Plane, fs view on inclined planes

(angled)

Shortened on adjacent planes

(vertical / horizontal)

Inclined Edge


Shortened & Angled planes. Edge vien on perp. Plane, fs view on inclined planes

Shortened & Angled

Oblique Edge


Angles planes. Edge vien on perp. Plane, fs view on inclined planes


Vertices planes. Edge vien on perp. Plane, fs view on inclined planes

  • A corner or point, intersection of 3 planes


Meaning of a Point planes. Edge vien on perp. Plane, fs view on inclined planes

  • A vertex

  • Point view of an edge


Meaning of a Line planes. Edge vien on perp. Plane, fs view on inclined planes

  • Visible or hidden:

  • An edge (intersection between 2 surfaces)

  • Edge view of a surface

  • Limiting element of a curved surface


Hidden Lines planes. Edge vien on perp. Plane, fs view on inclined planes

Dashed hidden lines are used to represent features that would be hidden behind other surfaces.


Center Lines planes. Edge vien on perp. Plane, fs view on inclined planes

Used to indicate symmetrical axes of circles


Order of Drawing planes. Edge vien on perp. Plane, fs view on inclined planes

  • Block out the views

  • Locate centerlines

  • Start details and arcs first

  • Draw dominant details

  • Check your views


Now guess the object
Now : Guess the object.... planes. Edge vien on perp. Plane, fs view on inclined planes


So the quiz object
So the Quiz Object.... planes. Edge vien on perp. Plane, fs view on inclined planes


Guess the object
Guess the object.... planes. Edge vien on perp. Plane, fs view on inclined planes


The object is a rectangular prism
The object .... Is a rectangular prism planes. Edge vien on perp. Plane, fs view on inclined planes


Guess the object1
Guess the object.... planes. Edge vien on perp. Plane, fs view on inclined planes


The object is a cylindrical prism
The object ... Is a cylindrical prism planes. Edge vien on perp. Plane, fs view on inclined planes


Third angle projection
Third Angle Projection... planes. Edge vien on perp. Plane, fs view on inclined planes


So the object
So The Object... planes. Edge vien on perp. Plane, fs view on inclined planes


THAT’S IT FOR TODAY! planes. Edge vien on perp. Plane, fs view on inclined planes

...


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