Problem 5.8 Projection of Planes

Problem 5.8 Projection of Planes – A pentagonal plate of side 60 mm is held on V.P. on one of its corner. The edge opposite to that corner makes an angle of 25° with the H.P. The flat surface of pentagon is inclined at 40° to the V.P. Draw the projections.

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Procedure:

Step-1 Draw a horizontal x-y line of some suitable length.

Step-2 Draw a pentagon of length of side 60 mm, above the x-y line at some suitable distance such that one of the sides of the pentagon should be perpendicular with the x-y line, as shown into the figure. And give the notations on it. It is the front view of the 1st stage.

Step-3 From the notations of the pentagon, draw vertical downward projectors up to the x-y line, draw a medium dark horizontal line between the length of these projectors, and give the notations as shown into the figure. It is the top view of the 1st stage.

Step-4 Copy the top view of the 1st stage with the same dimension as the top view of the 2nd stage at an angle 40° with the x-y line. Such that the point a should be on the x-y line, as shown in the figure. And give the other notations. It is top view of the 2nd stage.

Step-5 From the notations in the front view of the 1st stage, draw horizontal projectors in right hand direction of some suitable length and form the top view of the 2nd stage draw vertical projectors in upward direction such that these should intersect with the previously draw horizontal projectors at respective point. And give the notations at respective the points of intersection and connect these points in sequence with medium dark straight lines as shown in the figure. It is front view of the 2nd stage.

Step-6 Copy the front view of the 2nd stage as the front view of the 3rd stage such that the side c’-d’ of the pentagon should be inclined at the angle 25° with the x-y line, as shown in the figure. And give the notations on it. It is front view of the 3rd stage.

Step-7 From notations in the front view of the 3rd stage draw downward projectors and form the top view of the 2nd stage draw horizontal projectors in right hand side direction such that these should intersect with each other respectively. And give the notations on it. Then connect these points in sequence with medium dark straight lines. It is top view of the 3rd stage.

Step-8 Give the dimensions by any one method of dimensions and give the notations as shown into the figure.

Author: Vasim Machhar

An Engineering Drawing Geek. Working at Noble Group of Institutions, Junagadh as Head of Mechanical Engineering Department.