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# Orthographic Drawing - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about 'Orthographic Drawing' - liberty

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Presentation Transcript

• Projection  a view of an object

• Is a photograph enough to describe an object?

• A number of views, systematically arranged...

Source, at a definite distance.

Source, at an infinite distance

TOP

REAR

RIGHT

LEFT

FRONT

BOTTOM

The Glass Box

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.

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

?????

Mitter Line

R

F

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

D/2

D/2

D/2

D/2

T

• 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.

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)

(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

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

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

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

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

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

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

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

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

...