Engineering Graphics I

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Engineering Graphics I

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Presentation transcript:

Engineering Graphics 2018-19-I Lecture 15 TA101A Engineering Graphics 2018-19-I By Dr. Mukesh Sharma Professor DEPARTMENT OF CIVIL ENGINEERING INDIAN INSTITUTE OF TECHNOLOGY KANPUR KANPUR-208016, INDIA

Draw the projection of point A in different planes

HP P 120° X a H Q HINGE LINE d1 d3 A S d2 d4 a X ax1 VP a F R F

A1 P d4 ? Ax d3 d3 d1 ? AH Ax1 A2 BH Q d2 HP d1 BF AF

. . . N: Normal View Direction of sight is perpendicular or Normal What will it give? . N N . N N N . N Horizontal frontal Horizontal - Profile frontal - Profile A B C N N N Horizontal Frontal Profile (Inclined to frontal and profile) (Inclined to horizontal and profile) (Inclined to horizontal and frontal)

F H aH aF bH bF Is it frontal, horizontal or profile line? It is none, as it is inclined to all principal planes and called Oblique line Will it appear in true length (TL) in any of the principal plane? Let us learn how to find TL of an Oblique line

Observe All are parallel to hinge line in top view aH aH aH aH aH H F bF bF Observe All are in TL in Front view bF bF aF

bH bH Observe All are in TL in Top view bH bH aH H F Observe All are parallel to hinge line in Front view bF bF bF aF bF

Leads to very important Concept ? If line appears parallel to hinge line in a plane …...

bH aH H F aF TL bF bF- Method of Rotation

Method of Rotation – make line parallel to HP bH bH- TL aH HF aF bF Method of Rotation – make line parallel to HP