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TA 101 T hink and A nalyze Anupam Saxena Associate Professor Mechanical Engineering Compliant and Robotic Systems Lab Indian Institute of Technology Kanpur

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ANUPAM SAXENA TA101 LECTURE VI THIRD ANGLE PROJECTION

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ANUPAM SAXENA TA101 LECTURE VI THIRD ANGLE PROJECTION THIRD QUADRANT

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ANUPAM SAXENA TA101 LECTURE VI FIRST ANGLE PROJECTION

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ANUPAM SAXENA TA101 LECTURE VI FIRST ANGLE PROJECTION FIRST QUADRANT

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In case of DOUBTs or QUESTIONs

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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

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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!

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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 Important assumption: View the object from the right!

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A n for the drawing Comes with practice… and with MISTAKES!

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A n for the drawing Comes with practice… and with MISTAKES!

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A n for the drawing Comes with practice… and with MISTAKES!

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30 20 70 60 30 4 FACES AT R30 30 o SOLID II Front View 20 10

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60 40 10 40 3030 30 ANUPAM SAXENA TA101 LECTURE VIII ISOMETRIC PROJECTION: EXAMPLE WITH ELLIPSES

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ANUPAM SAXENA TA101 LECTURE VIII ISOMETRIC PROJECTION: SCALE 1:1 60 40 10 40 3030 30 10 USE ISOMETRIC SCALE USE TRUE SCALE ISOMETRIC PROJECTION/VIEW ISOMETRIC DRAWING

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Missing lines and Views

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Organization of Lectures and Laboratory Assignments TopicWeek (No. of Lectures)Lab Intro and Basic ConstructionsWeek 1 (2) Orthographic ProjectionsWeek 2 (2)Lab 1 Orthographic ProjectionsWeek 3 (2)Lab 2 Isometric ProjectionsWeek 4 (2)Lab 3 Missing ViewsWeek 5 (2)Lab 4 Sectional and AssemblyWeek 6 (2)Lab 5 Oblique ProjectionsWeek 7 (2)Lab 6 Perspective ProjectionsWeek 8 (2)Lab 7 Lines and PlanesWeek 9 (2)Lab 8 Lines and PlanesWeek 10 (2)Lab 9 Auxiliary ProjectionsWeek 11 (2)Lab 10 Intersection of lines/planes/solids Week 12 (2)Lab 11 Intersection and DevelopmentWeek 13 (2)Lab 12 TOTAL2612

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS ? ? ? ? ?

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS ? ?

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS Minimum possible lines to be introduced TA: It helps to draw the isometric view to get an idea of the object’s shape

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS TA: Even center lines are important

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ANUPAM SAXENA TA101 LECTURE IX MISSING LINES AND VIEWS

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T hink and A nalyze Until next time...

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