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Parameters and relations

Parameters and relations

Parameters and relations

I am looking for a little assistance with some nagging problems on relations and parameters. I have created an analysis feature (of an assembly) that calculates certain values in a relation. I want to use these values (real numbers) to be available as parameters of the assembly. For the prompted value of the parameter, I used the variable:fid_analysis_feature and the parameter took the correct value. However, it does not seem to update the value of the parameter when the values in the analysis feature change; not what I wanted.

I also want the values in a sketch feature (of the assembly) to take the values from the parameter times a scaling factor. Now, if the parameters don't take the value from the analysis feature, I am not updating the sketch feature's values either. Also, I can't seem to edit the relations driving the length of the sketch. The relations do not show up as relations of the assembly, or the feature. Strange?!

One more thing: I also want to create text (in the sketch feature) that will show the value of the parameter.

I have checked the Pro/E help and can not find out how to do these things. What am I missing? I am using Pro/E 2001. Thanks in advance for any assistance.

Best regards,

Matthew Ian Loew

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

RE: Parameters and relations

Hi Matthew,

The problem is simple. Follow me:

You create an analysis feature. Then you assign this result to a parameter via relations. You regenerate the model and your parameter will show the right value. Everything is fine until here.

Now you change something in your model and the analysis feature will show the NEW value, but your parameter will still hold the old value!!! How can this be, you ask? You need a second regeneration of the model. That's because PRO/E  will evaluate the reletions BEFORE starting regeneration of the part. Once the part is regenerated, and the analysis feature will hold the new value and this new value cannot be transmitted to your parameter, until a new regeneration

That's the problem. Please see the Thread554-24699 posted by Oxana. She or he had the same problem and I explained there what's wrong.

For your parametric sketch, forget about it. PRO/E cannot do it.


RE: Parameters and relations

As for the second part of your 2 part question:
(taken from ptc.com technical support)

If text is sketched (#Sketch, #Text) in the creation of either a cosmetic sketch feature, or a sketched datum curve feature, this text cannot be made to call out parametric information, such as a dimension or parameter value.

This is current Pro/ENGINEER functionality. Please file an Enhancement Request at http://www.ptc.com/cs/enhancements/form.htm to recommend this functionality.

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