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REVIEWS

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Engineering Drawing Skills

Lettering..good writing Line Types..clear between thick

and thin lines Orthographic Views Patience

See the example drawings in the notes.

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Line Types

Visible Line (thick)

Hidden Line (thick)

Center Line (thin)

Dimension Line (thin)

Construction Line (thin)

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Line Types

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Sketching Techniques

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ISOMETRIC VIEW

ORTHOGRAPHIC VIEW

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Orthographic Projection

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THIRD WEEK

ORTHOGRAPHIC Introduction to orthographic view. First angle projection view. Third angle projection view. Projection view symbols. Selection of direction views. Dimensioning for orthographic.

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Describing an Angle Bracket

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Orthographic Projection

Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner.

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Orthographic Views You can adequately describe most objects

with three orthographic views. Front Top Right

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Converting to Orthographic

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Orthographic Views

Hidden linesCentre line

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The Glass Box Approach

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Opening the Box

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Final Views

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Construction of ViewsC

ON

ST

RU

CT

ION

LIN

ES

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Object for exercise

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Solution

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Solution

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Solution

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First Angle Projection

Introduce in Europe as the earlier method of engineering drawing.

The object is as though in the first quarter ( 00 ~ 900)

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First Angle Projection

Symbol used in Engineering Drawing

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First Angle Projection

Based on 3 basic views :- Plan view (seen from the top of the object) Front view (seen from the front of the object) Side view (seen from the side of the object)

The shadows of the object are cast onto the plane behind the object

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First Angle Projection

The shadows of the object are cast onto the plane behind the object

SIDE VIEW FRONT VIEW

PLAN VIEW

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Third Angle Projection

Introduce in USA, this standard is being widely used till today

The object is as though in the first quarter ( 1800 ~ 2700)

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Third Angle Projection

The standard symbol

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Orthographic Views

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Third Angle Projection

Based on 3 basic views :- The plan view (as seen from the top of the object) The front view (as seen from the front of the object) The side view (as seen from the side of the object)

The shadows of the object are shown onto the plane in front of the object

PLAN

SIDE

VIEWFONT VIEW

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Third Angle Projection

The shadows of the object are shown onto the plane in front of the object

PLAN

SIDE VIEW

FRONT VIEW

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Theory of Dimensioning -Techniques and Conventions

Object is made of several parts Position (P) Size (S) Each feature is dimensioned once For each feature, dimension

positioned where its shape shows No Redundancy

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