Afternoon all,

Firstly apologies if this is posted in the wrong section. I believe I have but if not please feel free to move.

As the title suggests I am trying to calculate the major and minor radius of an ellipse.

See the attached image for estimated measurements. Note the image is not to scale - it is rough sketch.

The shaded section is a solid part that I have measured from. I believe the curve to be an ellipse, hence calculating the 2 radius.

As can be seen from the image, the curve is not a complete quarter of an ellipse. The curve ends at an approximate angle of 40degrees, where the part then continues vertically.

I have measured the distance from the start of the curve to the 40degree point as 15mm.

The distance between the horizontal surface at the top and the point at which the curve ends (at 40degrees) is measured at 5mm.

I am trying to model this part in CAD software hence require the major radius (a in image) and minor radius (b in image).

I will state that maths is not my strong point, but I have tried to find a solution online, with no luck.

So, firstly is is possible to calculate the major & minor radius from the dimensions given.

If so, how?!

If more information is required, and its possible for me to measure, I can do, just let me know.

Many thanks in advance and appreciate any help that can be given.