CAD Forum

sebrig wrote: ↑Wed Aug 11, 2021 3:25 am Hello folks!
I'm looking for a CAD software that allows me to enter curves in parametric form and create a coherent sketch element from it or at least handle the input via a csv o.s. As an example, a curve could be derived from the following formula ("a" corresponds to the variable; 0<a<2*pi):

x = 65*cos(a)-2*13^2/65*sin(2*a)*sin(a)-26*sqrt(cos(a)^2-(13/65*sin(2*a))^2)*cos(a)
y = 65*sin(a)-2*13^2/65*sin(2*a)*cos(a)-26*sqrt(cos(a)^2-(13/65*sin(2*a))^2)*sin(a)

I have already tried it with SolidWorks and Solid Edge.
While in SW you can enter the parameter representation of the curve via the feature "Equation driven curve", it is not possible to create a closed sketch element, because start and end point must not be identical. Subsequently, you have to draw a line manually, which then causes problems, for example, when creating an offset element. With the feature "Curve through XYZ points" half the curve can be created and then mirrored, but before that the data must be edited in such a way that I can't consider it to be part of a feasible workflow anymore.

With SE, the only way to read in a value table and create a closed curve is via "Curve by table", but without any major problems. The only thing that makes me a bit suspicious is that the curve can only be created with the soothing option on (i.e. some or all (?) points are not necessarily touched directly but pass through within a certain tolerance) and afterwards it is not clear to me which points deviate from the actual target. If this is a machine element that is really to be produced and is precisely defined via the parameterization, then this would not be acceptable.

Therefore I wanted to ask the CAD community if there are better alternatives. Has anyone here already had a similar problem and could solve it or find the "perfect" software for it?

I am happy about any suggestion!

Cheers

While in SW you can enter the parameter representation of the curve via the feature "Equation driven curve", it is not possible to create a closed sketch element, because start and end point must not be identical

SPerman wrote: ↑Wed Aug 11, 2021 9:53 am I'm 99% sure NX has that ability.

sebrig wrote: ↑Wed Aug 11, 2021 3:25 am Hello folks!
I'm looking for a CAD software that allows me to enter curves in parametric form and create a coherent sketch element from it or at least handle the input via a csv o.s. As an example, a curve could be derived from the following formula ("a" corresponds to the variable; 0<a<2*pi):

x = 65*cos(a)-2*13^2/65*sin(2*a)*sin(a)-26*sqrt(cos(a)^2-(13/65*sin(2*a))^2)*cos(a)
y = 65*sin(a)-2*13^2/65*sin(2*a)*cos(a)-26*sqrt(cos(a)^2-(13/65*sin(2*a))^2)*sin(a)

I have already tried it with SolidWorks and Solid Edge.
While in SW you can enter the parameter representation of the curve via the feature "Equation driven curve", it is not possible to create a closed sketch element, because start and end point must not be identical. Subsequently, you have to draw a line manually, which then causes problems, for example, when creating an offset element. With the feature "Curve through XYZ points" half the curve can be created and then mirrored, but before that the data must be edited in such a way that I can't consider it to be part of a feasible workflow anymore.

With SE, the only way to read in a value table and create a closed curve is via "Curve by table", but without any major problems. The only thing that makes me a bit suspicious is that the curve can only be created with the soothing option on (i.e. some or all (?) points are not necessarily touched directly but pass through within a certain tolerance) and afterwards it is not clear to me which points deviate from the actual target. If this is a machine element that is really to be produced and is precisely defined via the parameterization, then this would not be acceptable.

Therefore I wanted to ask the CAD community if there are better alternatives. Has anyone here already had a similar problem and could solve it or find the "perfect" software for it?

I am happy about any suggestion!

Cheers