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08-22-2017 03:45 AM

Hi everyone,

Here is my problem :

I need to create a parabola with these equations :

X=t

Y=0

Z=t²/4*F

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

Playmo31

Solved! Go to Solution.

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7 REPLIES

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08-22-2017 03:50 AM

t=1

F=10

xt=t

yt=0

zt=t*t/4*F

Then go to Law Curve

simple OK to take the defaults

Steve V

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08-22-2017 05:22 AM

Hi Steven,

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 :/ )

Playmo31

Playmo

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08-22-2017 05:27 AM

Do I have to define 't' and the variable 'F' before ?

Yes.

You have to define a expression first then you can use it in the formula of other expression.

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08-22-2017 05:30 AM

Thanks Ganesh but how can I define these variable ?

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08-22-2017 05:32 AM

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

Press Apply

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

Steve V

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08-22-2017 05:34 AM

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08-22-2017 07:37 AM

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.

Scott

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