Orthographic Drawing

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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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Presentation Transcript
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

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.

FS on all planes.

Oblique Surface

True length in adjacent planes

Point on perpendicular Plane.

Normal Edge

True length in parallel plane

(angled)

Shortened on adjacent planes

(vertical / horizontal)

Inclined Edge

Shortened & Angled

Shortened & Angled

Oblique Edge

Vertices

• A corner or point, intersection of 3 planes

Meaning of a Point

• A vertex
• Point view of an edge

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.

Center Lines

Used to indicate symmetrical axes of circles

Order of Drawing

• Block out the views
• Locate centerlines
• Start details and arcs first
• Draw dominant details
• Check your views