# Thread: How to Draw This?

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Originally Posted by basty
@ReMark
How do I draw an ogee curve and reverse curve?
Can someone please teach me that?

Have you looked at post #26 by eldon?

2. What about if I draw the B-C arc first like post #19?

How do I draw the A-B arc?

[IMG][/IMG]

3. Originally Posted by basty
......How do I draw the A-B arc?
Draw the perpendicular bisector between A and B. Draw the line D to B and extend it to the perpendicular bisector at F. F is the centre of the circle.

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As noted, there are an infinite number of solutions to this problem but they all as Steven-g noted must have " two arc centres should be on a straight line that passes through the tangent point".

I created a parametric model (see attached file) that lets you dynamically review the solutions. Just drag the free end of the yellow or magenta lines and the arc radii and location will adjust automatically. It should be noted that in order to determine and reference the intersection point of the yellow line and the blue line (the perpendicular bisector) I cheated a bit. There is a small circle (0.01 dia) that is tangent to the two lines. This circle is used as the reference point for the center of the arc. There is a collinear constraint between the yellow and magenta lines

A Screencast of the movement is here: http://autode.sk/2DCVzXR

h21.JPG
h22.jpg
HowToDrawThis-1.dwg

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