Engineering Graphics 2018-19-I Lecture 25 TA101A Engineering Graphics 2018-19-I By Dr. Mukesh Sharma Professor DEPARTMENT OF CIVIL ENGINEERING INDIAN INSTITUTE OF TECHNOLOGY KANPUR KANPUR-208016, INDIA

(1) Sections: A10, A11, A12 and A14 Date: 03-11-2018 (Saturday) Time: 10:00 AM - 01:00 PM Venue (for A10, A11, A12): New Core Lab, CC01 and CC03 Venue (for A14): AutoDesk Lab, Drawing Hall __________________________________________ (2) Sections: A1, A2 and A3 Date: 05-11-2018 (Monday) Venue: New Core Lab, CC01 and CC03 _________________________________________ 3) Sections: A7, A8 and A9 Date: 08-11-2018 (Thursday) (4) Sections: A4, A5, A6 and A13 Date: 10-11-2018 (Saturday) Time: 2:00 PM - 05:00 PM Venue (for A4, A5, A6): New Core Lab, CC01 and CC03 Venue (for A13): AutoDesk Lab, Drawing Hall ______________________________________________ The TAs/Tutors will grade your work on the spot after completion of Lab. Do not delete your work until it is graded and you have consent from TAs/Tutors to delete it. If you want to save your drawing and keep it, you can do so.

All Objects are made of points, lines and planes To develop the surface you need TL of lines and TS of planes

Develop the surface of the object so that it is constructed Developed surface is cut from sheet, paper, leather Object surface is made of lines, planes and points Idea is to develop these surfaces in True Shape. Most important points are find TL of line and TS of planes Remember we want the magnitude of line and plane – for this we do not care about the orientation or it FV and TV. Normally Auxiliary plane method is not used – as you need information for so many lines and many auxiliary views.

Development of Surfaces - Example

How to open – there is a convention It should be inside layer up Developed surface is shown on flat surface seen directly by the observer

True length of line by revolution YH X Path of Revolution XH YHR Axis H F XF F ӨR Y O TL YR H TL Axis ӨH YF YFR OBSERVATION If axis is perpendicular to the plane, the hypotenuse of triangle like XOYR will always give the TL of the line. Or, if perpendicular and base are known so is the TL.

Development of Truncated Prism 3 4 Measuring line and bend line 4 4 2 Lateral edge 3,5 3 5 1 6 2,6 2 1 1 1 Seam line A A A D C,E B,F B F C E D E C B F A A Right section and base Stretchout or girth C,3 B,2 A D F E D,4 A,1 Lap seam Lateral surface E,5 F,6 Lay off the perimeter of the base on line AA

Development of Truncated Pyramid ET FT A1 F1 Seam line LT E1 KT N1 MT DT OT NT AT L1 D1 JT HT K1 CT BT C1 OF M1 J1 O1 H1 MF B1 JF JR HF HR N1 Development of Truncated Pyramid A1 NF We should find TL of truncated edges. Is ON or NA see in TL somewhere? Yes in FV. Mark it on developed surface How to get OH in TL? Rotate OH so that it is parallel to hinge line and project it in FV Repeat process for OJ. OM is is already in TL FV. Transfer these on developed surface AF DF

Development of Irregular Pyramid Cr Dr D1 Or Br Ar OF O1 C1 B1 AR BFCF AFDF A1

Development of an Oblique Pyramid Seam line O1 Cr Dr A1 Or Bend line Br Ar D1 B1 Or Stretchout or girth C1 Axis BRCR AR,DR Soldered lap seam CRBR ARDR

Development of an Truncated Cylinder * * * * * * * * * * * *