Transcription of Unit 3 projection of solid 2014 - mechanical
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Unit 3 projection of solid 2014 - mechanical
ENGINEERING GRAPHICSENGINEERING GRAPHICSUNIT IIIUNIT IIIPROJECTION OF SOLIDSPROJECTION OF SOLIDSPROJECTION OF SOLIDSPROJECTION OF (Prism (or) Pyramid)Polyhedron (Prism (or) Pyramid)((ii) Triangular ) Triangular (ii) Rectangular(ii) Rectangular(iii) Square(iii) Square(iv) Pentagonal(iv) Pentagonal(v) Hexagonal(v) Hexagonal2. Solids of revolution 2. Solids of revolution (i)(i)CylinderCylinder(ii)(ii)ConeConeHo w to construct a PentagonHow to construct a PentagonABCDET otal Angle = 360oNumber of sides = 5 Required Angle = 360o =72o5 the line AB of given A draw a line for an angle 72o and for the given B draw a line for angle of 72oand for the given C as centre draw an arc with the given length as E as centre, cut the arc with the same radius72oHow to find mid point of a polygon How to find mid point of a polygon having odd number of sideshaving odd number of sidesABCDE72oBisectors for sides AB and another bisector for the side cutting point of
drawing the object shape •Always the solid is tilted towards right side. • Hence the resting part should be kept on the right side, when the object shape is drawn. • For pyramids the diagonals should be joined (longer edges should be shown) •For prisms diagonals should not be joined (longer edges will coincide with the corners in the ...
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