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

Development of Surfaces Developable/Right angled surfaces

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 (1)Lab 6 Perspective ProjectionsWeek 8 (3)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

TA: CERTAIN DEVELOPMENTS ARE EXACT TA: OTHERS ARE APPROXIMATE TRUE LENGTHS

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL TA: FORMING AN OCTAGONAL PYRAMID FROM A SINGLE PIECE OF PAPER TA: INFO GOOD ENOUGH TO TRANSFER ON PAPER ?

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL TA: WHAT IF THE PYRAMID IS TRUNCATED? TA: KNOW WHERE THE INTERSECTION POINTS ARE? TA: INTERSECTION POINTS ON 4, 8?

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c TA:ALWAYS LABEL THE POINTS TA: IT IS THE TRUE LENGTHS THAT GET MARKED ON THE PAPER TA: FIND THEM

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c TA: WHAT ABOUT THE REST ?

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c TA: REALIZE THAT TO GET THE TRUE LENGTHS YOU NEED TO PROJECT THE INTERSECTION POINTS ONTO THE EXTREME RIGHT/LEFT EDGE OF THE SOLID

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c d d b b d TA: OBSERVE HOW I CHANGE THE REPRESENTATION…

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c d d b b d TA: WHY ? TA: TO REPRESENTHAT THE PAPER IS BENT AT THESE EDGES

ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c d d b b d e d d c c b b a TA: NEED TO DETERMINE THE TRUE SHAPE OF PLANE ABCDE-DCBA

TL1 TL TL a b c d e a b c e b c d d a b c e b c d d e a c c d b b d e d d c c b b a 2 e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES TA: CONVENTIONALLY, START DEVELOPMENT WITH THE SMALLEST LENGTH, AND END WITH THE SAME

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b b a TA: CONSTITUTES THE LATERAL BOUNDING SURFACE TA: CONSTITUTES THE BOUNDING SURFACE AT THE TOP TA: CONSTITUTES THE BOUNDING SURFACE AT THE BOTTOM TA: IS IT IN TRUE SHAPE ALREADY?

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b b a TA: ROTATE AND ALLIGN PLANES

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b TA: IF YOU CUT THIS PAPER, FOLD IT AND GLUE APPROPROATELY, YOU WILL GET A BOUNDED TRUNCATED PYRAMID

e a c c d b b d e ANUPAM SAXENA TA101 LECTURE XXV DEVELOPMENT OF SURFACES e d d c c b TA: WOULD THE LOCATION OF THE TOP AND BOTTOM BOUNDING SURFACE MAKE ANY DIFFERENCE? TA: GOT TO LEAVE SUFFICIENT GAP FOR THE SEAMS

T hink and A nalyze Until next time...

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