In this sketch I have values linked to equations used in derived parts. The arc below is fully defined, but I gave it only 3 information (2 points and a radius). The direction of the curvature (convex/concave) is not defined here and I would like to define in an equation. The "focal" variable can take a positive value for a positive curvature and a negative value for a negative curvature.
How can I change my arc direction from my equation parameter?
Perfect solution.
Hi,
Thanks for your suggestions. I still did not figured out how to make it work. Let's see what I did:
1. Dimension the center (of the circle) from an horizontal line. Input a negative value and it will flip:
Actually it did not flip the circule but it changed the way the circle is drawn:
Original:
After entering -10 instead of 40:
2. Add a mirrored curve.
Yes this seems to be a good solution, but I cannot control the visibility of "construction/not construction lines" with equations.
3. Add a tangent line then a dimension.
Same issue that with solution 1. The circle does not really flip.
You may want to try this. Instead of a two point circle, use a three point circle dimension-ed as shown below. NOTE: The blue dimension is just there to show you what the formula is calculating and the radius dimension in the sketch is reference.
Equation variables are: Focal and Radius. H is just an intermediate variable to show the formula; you could substitute the formula for H in the Curve Height equation.
Other notes: I found I had to use a full circle otherwise the arc flipped the wrong way (see second screen shot). By using a full circle you will need to use the contour option to extrude the shape (unless someone knows how to prevent the arc from flipping).
Thanks so much. This solved my problem.
You could try one of the following indirect things:
I think all of them will be tricky though, as Solidworks is great in figuring out solutions to equations that you didn't anticipate.