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?
A conic sketch is multiple radius - like a French Curve....
I know, but was hoping there would be some kind of equation to calculate a close radius
You could add a few points and use a 3 point circle and make the circle a construction line, then snap dimension on that circle, then as you change the conic sketch, the circle will move with it..
Attach your *.sldprt attempt here.
Working on a confidential project,I wish I could to make it easier to get help.
Seems like this requirement would be relatively easy to reproduce in a dummy part that exhibits the behavior needed in the proprietary design.
conic curve can be elliptical, parabolic or hyperbolic - how it can be defined for your measurement?
I was taught this trick by someone:
I see that I forgot to point out something:
The highlighted number gives you the virtual radius in that area. It isn't perfect, but can get you close anyway.
It is a good way to measure imported fillets and curves if it comes in as a spline.
It might be, but I am at a loss
A conic section is exactly that - a planar section through a cone.
The type of section (circle, ellipse, parabola...) is dependent on the size of the cone and the position and angle of the plane.
Are you attempting to reverse-engineer an existing curve, or are you attempting to create a new curve?
is there any way to get a list of the radius through the curvature?
I think it's possible to sub divide any conic into two smaller conics
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
Trying to backwards engineer this part, need to get radius for boss. I will look at how you have your pictures thank you Rob
There's also this information provided in the conic property manager
Use the segment tool and add points, then overlay 3 point construction arcs. That doesn't split the curve and gives you approx. curvature
That's a good idea!
I'm not sure what Jennifer is trying to do... If she's reverse engineering a conic, you can always use a driven dimension and an end tangent relation
I will try both options. I am not very familiar with using this command. Completely new to me, but hopefully with all your help I can figure this out.
A conic has multiple radii!
..wait... did someone already mansplain that???
If you're trying to measure instantaneous radius at a point, you could possibly attach an arc and use equal curvature constraint.
It may not work within the same sketch originating the conic. You might have to do this in a second sketch.
Yeah I know it’s multiple radii, they want to know out of all the radii the smallest one.
I'm not 100% on this, but its my best guess
For a random conic
sketch in the tangency
Now in a new sketch (you are allowed to use the tangent relation)
sketch in a new conic and read the nose radi
I think you can only look at this value, but easy enough to remember it and add a circle
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 = (x2/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.
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