First and Third Angle in Engineering Drawing
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Transcript of First and Third Angle in Engineering Drawing
![Page 1: First and Third Angle in Engineering Drawing](https://reader034.fdocuments.in/reader034/viewer/2022050920/5527caa84a795938118b47ce/html5/thumbnails/1.jpg)
PROJECTION SYSTEMS
1. First angle system
2. Third angle system
First Quadrant
ThirdQuadrant
- European country
- ISO standard
- Canada, USA,
Japan, Thailand
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ORTHOGRAPHIC PROJECTION
1st angle system 3rd angle system
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ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Foldingline
Foldingline
Foldingline
Foldingline
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ORTHOGRAPHIC VIEWS
1st angle system 3rd angle system
Front View
Front View
Right Side View
Right Side View
Top View
Top View
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First angle system Third angle system
PROJECTION SYMBOLS
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PROJECTION SYMBOLS
d 1.7d
2.2d
Suggested proportion
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Orthographic Writing Steps
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WRITING STEPS
1. Select the necessary views
2. Layout the views.
3. Project the views.
4. Dimension the views.
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1. SELECT THE NECESSARY VIEWS
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45
152
152
64
2. LAYOUT THE VIEWS
A4
25
Choose anappropriate scale
1:1
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PROJECT THE VIEWS
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DIMENSION THE VIEWS
NOTES1. Dimensions in millimeters.2. ….
PART NAME
xx
x x
y
y
y
y
z
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TRANSFERINGTHE DEPTH DIMENSION
1. Direct measurement
01
23
27
0 1 2 3 Starting point27
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TRANSFERINGTHE DEPTH DIMENSION
2. Use miter line
45
Views too close
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Basic Dimensioning
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1. Extension lines
2. Dimension lines
3. Leader lines
4. Dimension numbers
5. Local notes
COMPONENTS
10 27
43
10 Drill, 2 HolesR16
17
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Tangencies and Intersections
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No line is formed when curved surface tangent
to a plane surface.
No line
No line
TANGENT & INTERSECTION
Line is formed when curved surface intersects
a plane surface.
tangent
tangent
intersect
intersect
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TANGENT & INTERSECTION
intersect
tangenttangent
tangent
plane
limiting element
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TANGENT & INTERSECTION
intersect
No line
tangent
tangent
tangent
tangent
tangent
No line
tangentNo line