Engineering Graphics: Unit I (c): Conic Sections
Construction of Parabola by Offset Method
Engineering Graphics (EG)
Data known : 1. Base 2. Rise
CONSTRUCTION OF PARABOLA BY OFFSET METHOD 1. Base 2. Rise Example 10: Construct a parabola of base (span) 8m and rise 5m by offset method. 1. Full scale cannot be followed to draw with given dimensions, 8m and 5m. Hence, a suitable reduced scale to be followed. 2. Draw a rectangle ABCD of length 80mm and height 50mm and locate the mid point of AB at O. 3. Draw bisector through O to cut the edge CD at E. 4. Divide ED into any number of equal parts (say 4) and name the parts as 1, 2 and 3 from D. 5. Draw vertical lines through 1, 2 and 3 parallel to OE to mark the offsets. 6. To measure the offset through the point 1. Distance E-1 is 3/4 of the length ED. Hence, offset is equal to (3/4)2 of axis ie., (3/4)2 × EO = (3/4)2 × 50mm = 28.12mm. Measure 28.12 mm along the vertical line passing through 1 to get P1. 7. Similarly locate the points P2 and P3 through 2 and 3 respectively by computing respective offsets. 8. Draw a smooth curve joining the points A, P1, P2, P3 and E which is half of the parabola. 9. Repeating the same procedure on the right side of axis, the other half of parabola is constructed. Data known :
Procedure:
Engineering Graphics: Unit I (c): Conic Sections : Tag: : Engineering Graphics (EG) - Construction of Parabola by Offset Method
Engineering Graphics: Unit I (c): Conic Sections
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Engineering Graphics
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