Here is my problem :
I need to create a parabola with these equations :
where " F " is the focal length (a value that I could change).
A tool already exists in NX (Curve -> More -> Parabola) but I have to create new curve everytime when I need to change the focal lentgth.
I would like to change just the paramater " F " in the " Part Navigator " to change the parabola shape.
Do you know if this is possible ?
Thanks in advance
Solved! Go to Solution.
Thanks for your quick answer.
When I try to write these expressions in Tools -> Expressions : Formula
NX says "Expression 't' not found".
Do I have to define 't' and the variable 'F' before ?
(I have never used the Expressions tools before :/ )
Yes you first have to create the expressions first
You also have to create the expression t first as other expressions reference this.
Go to Tools->Expressions
First change the type from Number - Length to Number - Constant
In Name enter t and in Formula enter 1
Actually it does not matter what value you give t it will change internally from 0 to 1 in the Law Curve feature.
Now do the same for the other values create F next as used in the expression later.
OK out of Expressions
Now go to Law Extension and simply OK
Another option is to use the Reuse Library. NX supplies 13 Law Curves OOTB in the Reuse Object Libary. The image below shows the menu for the parabola and the other curves that are available. You also get a menu to set the parameters when you insert the curve. After that you can either change the values from the part navigator as the curve becomes a feature, or in the expression system.