Engineering Graphics: Unit I (c): Conic Sections

Construction of Parabola by Rectangular Method

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Data known : 1. Base 2. Axis

CONSTRUCTION OF PARABOLA BY RECTANGULAR METHOD

1. Base

2. Axis

Example 8: Construct a parabola of base 80mm and axis 60mm by rectangular method.

1. Draw a rectangle ABCD of base 80mm and axis 60mm.

2. Locate the mid point of AB at O and draw bisector through O to cut CD at E.

3. Divide AD and AO into same number of equal parts (say 4) and name the parts as 1, 2 and 3 on AO from A and 1', 2′ and 3′ on AD from A.

4. Join the points 1', 2′ and 3′ with E.

5. Draw vertical lines through 1, 2 and 3 to cut D-1', D-2' and D-3' at P1, P2 and P3 respectively.

6. Join the points A, P1, P2, P3 and E by a smooth curve which is half of the parabola.

7. Repeating the same procedure on the right side of axis, the other half of parabola is constructed.

Engineering Graphics: Unit I (c): Conic Sections : Tag: : Engineering Graphics (EG) - Construction of Parabola by Rectangular Method

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Engineering Graphics

GE3251 eg 2nd semester | 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation