Engineering Graphics: Unit I (c): Conic Sections
Construction of Parabola by Tangent Method
Engineering Graphics (EG)
Data known : 1. Base 2. Axis
CONSTRUCTION OF PARABOLA BY TANGENT METHOD 1. Base 2. Axis Example 7: Construct a parabola with the length of base as 80mm and axis 40mm. Also draw a tangent and normal to the curve at a point 34 mm from the base. 1. Draw the base AB and draw its bisector through its mid point C. 2. Mark the points D and E on the bisector such that CD = DE = 40 mm. 3. Join E with A and B, Lines AE and BE are the tangents to the parabola at A and B respectively. 4. Divide the tangents AE and BE into same number of parts (say 6) and name the parts as 1, 2 etc., on AB from A and 1', 2' etc., on EB from E. 5. Join 1 and 1', 2 and 2' etc., which are the tangents to the required parabola... 6. Draw a smooth curve passing through the points A, D and B such that tangential to the above lines 1-1', 2-2' etc., i) Locate a point M on the curve at a height of 34mm (given in problem) from base then draw a horizontal through M to meet the axis at F. ii) On the axis mark a point G such that GD = DF. iii) Join G and M and extend which is the required TT' tangent at M. iv) Draw a line NN' perpendicular to the tangent drawn, which is the required normal.Data known :
Procedure:
To draw Tangent and normal
Engineering Graphics: Unit I (c): Conic Sections : Tag: : Engineering Graphics (EG) - Construction of Parabola by Tangent Method
Engineering Graphics: Unit I (c): Conic Sections
Under Subject
Engineering Graphics
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