Problem 5.6 Projection of Planes – An elliptical plate of dimension 140 mm X 80 mm rests on a point of its periphery on H.P. and inclined with it such that its plan is a circle. Draw the projection and find out the inclination of it with H.P.
Step-1 Draw a horizontal x-y line of some suitable length.
Step-2 Draw an ellipse by any method with major axis of length 140 mm and minor axis of length 80 mm, below the x-y line at some suitable distance as shown into the figure. And give the notations. It is the top view of the 1st stage.
Step-3 From the notations of the ellipse, draw vertical projectors up to the x-y line, from these points of intersections, draw a medium dark horizontal line, and give the notations as shown into the figure. It is the front view of the 1st stage.
Step-4 Extend the horizontal major axis of the ellipse in top view in right hand side direction and on the axis mark a point and draw a circle of diameter equal to length of the minor axis of the ellipse, which is 80 mm. And give notations on it. It is top view of the 2nd stage.
Step-5 From the notation a of the top view of the 2nd stage draw a vertical projector up to the x-y line and give the notation of that point as a’ and form the notation b draw a vertical projector in upward direction of some suitable length.
Step-6 The form the point a’ draw a medium dark line equal to the length 140 mm which should intersect with the vertical projector coming out from the point b. And give the notation on it as b’. And give the other notations on it. It is front view of the 3rd stage.
Step-7 Give the dimensions by any one method of dimensions and give the notations as shown into the figure.