Engineering Graphics 2018-19-I Lecture 16 TA101A Engineering Graphics 2018-19-I By Dr. Mukesh Sharma Professor DEPARTMENT OF CIVIL ENGINEERING INDIAN INSTITUTE OF TECHNOLOGY KANPUR KANPUR-208016, INDIA
Method of Rotation
Frequency Distribution of Mid-sem Marks
P bH aH A aF bF F H I B Go Around and see through plane in which the oblique line will appear parallel And that is your auxiliary plane on which projection of line will be in TL
Line of sight (normal to plane) aH bH A aF H F U P I T ai B True Length (TL) bF bi R S Line of sight (normal to plane)
B C D E A H F bH bF aH aF H F bH bF aH aF H F bH bF aH aF H F bH bF aH I H F bH bF aH aF E I d aI TL H I Line of Sight bI A
bI bH TL aI aH H F A1 aF bF
bH aI aH d1 TL H F d1 aF aP I bI d2 P d2 bF bP F P
Slope of a Line Think of standing on ground parallel to a flyover EDGE VIEW OF HORIZONTALCEILING EDGE VIEW OF HORIZONTAL GROUND Y=RISE X=RUN C D TL H H F Think of standing on ground parallel to a flyover Run/Rise = Y/X = tanθH θH is slope angle of line CD tanθH ×100 is called grade of line (+/-) Can only be seen when line appears in TL and view showing the height
aH aF bH bF H I X=10 Y= - 4.9 TL aI bi H= - 260
Bearing of Line Quiz Can be seen only in …………view N600 W N300 E S 450 W D A C B E Quiz Can be seen only in …………view Should line be in TL? Ans. Horizontal Not necessary
Azimuth of line
Point view of a line Line of sight a2b2 bH d 2 H 1 I aH bI TL H aI F aF bF
TL 2H 3H TABLE TOP TRUE SURFACE 1H 4H Line of sight for H view 1F2F Edge view 2H 3H 1H 4H TL H F 1F2F 2F3F
True Shape of Plane through EV and Auxiliary Plane SA1 A A 1 S 2 H S A2 A1 EV XH F R X A1 , R H A1 X P A2 TS H H R F A2 P S A1 F P A2 XF TL P F RF
True Shape of Plane through EV and Method of Rotation 1 RH XH XA1, RA1 PH H P‘A1 F S F' P A1 S F XF P TS F P F' R F True Shape of Plane through EV and Method of Rotation
True Shape of Plane through EV and Method of Rotation 1 RH XH XA1, RA1 PH H P‘A1 F S F' P A1 SF 90˚ XF P TS 90˚ F PF’ R F True Shape of Plane through EV and Method of Rotation
2H TL 3H 4H 3B H 3F IH 3A F 2F 4F 2B H TS A IF IA IB