Can anyone help me? I think I know that I can't measure a radius when I have used a conic sketch. I really need to know if there is maybe a equation to figure out the radius of the conic sketch created?

Can anyone help me? I think I know that I can't measure a radius when I have used a conic sketch. I really need to know if there is maybe a equation to figure out the radius of the conic sketch created?

Hi Jennifer

I think it's possible to sub divide any conic into two smaller conics

like this

repeating again

Once you have enough its easy enough to approximate with 3 pt arcs

Solidworks isn't bad at keeping up with changes, but its best to not do BIG jumps, or the sketch solver gets lost

and you have to suppress or delete a relation or two so it solves again

2016 attached

Hi Jennifer, Completely unrelated I just stumbled upon this in the API and thought it might help you.

2016 SOLIDWORKS API Help - Find Minimum Radius of Curve (VBA)

Looking at the code it requires a model edge, so to test it I just made a planar surface with a conic edge.

I then used the output to draw a circle. Note the coordinates returned are the point on the curve, not the center of the circle so I tested it like this....

looks good to me

The conic sketch tool in SW uses a different form than typically found in optics which is what I have used with the Formula Driven Sketch Tool. I use the formula driven sketch with this form:

*y*= (*x*^{2}/*R*) / (1 +√[1 - (1+*K*) ∙ (*x*/*R*)^{2}]),Where: The axis lies along the

*y*-axis and represents the height as a function of*x*.The vertex is at

*y*= 0.*K*= Conic constant Rho*R*= Radius of curvature.You should be able to match your existing curve starting with a Conic constant K = -1 for a parabolic.

A conic sketch is multiple radius - like a French Curve....