Transcript TA 101 Think and Analyze Anupam Saxena Associate Professor Mechanical Engineering Compliant and Robotic Systems Lab Indian Institute of Technology Kanpur ANUPAM SAXENA TA101 LECTURE VI THIRD ANGLE PROJECTION THIRD.

TA 101
Think and Analyze
Anupam Saxena
Associate Professor
Mechanical Engineering
Compliant and Robotic Systems Lab
Indian Institute of Technology Kanpur
ANUPAM SAXENA
TA101 LECTURE VI
THIRD ANGLE PROJECTION
THIRD QUADRANT
ANUPAM SAXENA
TA101 LECTURE VI
THIRD ANGLE PROJECTION
ANUPAM SAXENA
TA101 LECTURE VI
FIRST ANGLE PROJECTION
FIRST QUADRANT
ANUPAM SAXENA
TA101 LECTURE VI
FIRST ANGLE PROJECTION
In case of DOUBTs or QUESTIONs
First angle projection is like keeping a solid in front of a
screen and seeing it from the other side of the screen. It is
just projecting all the edges, points features etc.. over a
plane that is behind the solid.
answers.yahoo.com
In first-angle projection, the projectors originate as if
radiated from a viewer's eyeballs and shoot through the 3D
object to project a 2D image onto the plane behind it.
In third-angle projection, the projectors originate as if
radiated from the 3D object itself and shoot away from the
3D object to project a 2D image onto the plane in front of it.
http://en.wikipedia.org/wiki/Engineering_drawing
Important assumption: View the object from the right!
In first-angle projection, the
object is conceptually located
in quadrant I, i.e. it floats
above and before the
viewing planes, the planes
are opaque, and each view
is pushed through the object
onto the plane furthest from
it.
http://en.wikipedia.org/wiki/Multiview_orthographic_projection
Important assumption: View the object from the right!
In
third-angle
projection, the object
is conceptually located
in quadrant III, i.e. it is
positioned below and
behind the viewing
planes, the planes are
transparent, and each
view is pulled onto the
plane closest to it.
http://en.wikipedia.org/wiki/Multiview_orthographic_projection
An
for the drawing
Comes with practice…
and with MISTAKES!
An
for the drawing
Comes with practice…
and with MISTAKES!
An
for the drawing
Comes with practice…
and with MISTAKES!
30
4 FACES
AT R30
20
70
 30
o
Front View
SOLID II
10
60
60
30
40
30
40
40
ANUPAM SAXENA
TA101 LECTURE VIII
ISOMETRIC PROJECTION: EXAMPLE WITH ELLIPSES
10
60
60
30
40
10
30
40
40
USE ISOMETRIC SCALE
ISOMETRIC PROJECTION/VIEW
USE TRUE SCALE
ISOMETRIC DRAWING
ANUPAM SAXENA
TA101 LECTURE VIII
ISOMETRIC PROJECTION: SCALE 1:1
Missing lines and Views
Organization of Lectures and Laboratory Assignments
Topic
Week (No. of Lectures)
Lab
Intro and Basic Constructions
Week 1 (2)
Orthographic Projections
Week 2 (2)
Lab 1
Orthographic Projections
Week 3 (2)
Lab 2
Isometric Projections
Week 4 (2)
Lab 3
Missing Views
Week 5 (2)
Lab 4
Sectional and Assembly
Week 6 (2)
Lab 5
Oblique Projections
Week 7 (2)
Lab 6
Perspective Projections
Week 8 (2)
Lab 7
Lines and Planes
Week 9 (2)
Lab 8
Lines and Planes
Week 10 (2)
Lab 9
Auxiliary Projections
Week 11 (2)
Lab 10
Intersection of
lines/planes/solids
Week 12 (2)
Lab 11
Intersection and Development
Week 13 (2)
Lab 12
TOTAL
26
12
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ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
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ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
TA: It helps to draw the isometric view to get an idea of the object’s shape
Minimum possible lines to be introduced
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
TA: Even center lines are important
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
ANUPAM SAXENA
TA101 LECTURE IX
MISSING LINES AND VIEWS
Think and Analyze
Until next time...