Orthographic English
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Transcript of Orthographic English
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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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