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Matteo_198716-Pearl
16-Pearl
December 1, 2021
Question

ACCURACY FROM RELATIVE TO ABSOLUTE CREO 7

  • December 1, 2021
  • 2 replies
  • 5244 views

I have a client who with creo 7 cannot change from relative to absolute precision.

I tried to activate the enable_assolute_accuracy entry for it but it is no longer valid.

Do you know if there is a new entry, or how to change a model from relative to absolute?

It seems that the menu in the properties makes me change only the values but not change the method.

Hello

Thanks

2 replies

kdirth
21-Topaz I
kdirth21-Topaz I
21-Topaz I
December 1, 2021

The options to enable absolute accuracy have been removed in 7.0.  Default for new models in 7.0 is absolute accuracy (using a start part uses the defined accuracy in the start part).  Not sure why you are not being allowed to change from relative to absolute.  I am able to change accuracy of old parts.  Though most of the time complex parts tend to fail when changing to absolute.

kdirth_0-1638364668676.png

 

There is always more to learn.
    L
    LawrenceS18-Opal
    18-Opal
    July 15, 2022

    @kdirth, 

    I am very interested as to the issues you have experienced, as so far I have only from other users that absolute accuracy is very stable in Creo7 and causes less failures.  What you are saying though is truely a show stopper and may put a stop to us switching to Abs accuracy for any parts at our company.  Can you elaborate on how your models are failing when going from Relative to Absolute Accuracy?

    • How complex is complex?  Bounding box size?  Size of file?  Number of features/components in the feature tree? Something else that makes it complex?
    • Did you experience these failures on parts, asms, drws or all?
    • What value for absolute accuracy did you use?  Or did you try several?  e.g. 0.0003"?  0.0001"?  Are you metric or English units?
    • If failures were in assembly mode, were the components and asm all at absolute accuracy?  Or just the asm?  Or just the asm and some of the components?
    • What build of Creo7 have you experienced this on?  e.g. we are testing Creo 7.0.7.0 right now.
    • Did you submit a case to PTC?  If so is there a ticket you can refer me to so that I can track what the exact issue is and if and what version they are correcting it on?
    kdirth
    21-Topaz I
    kdirth21-Topaz I
    21-Topaz I
    July 15, 2022

    The problem is only with part models and has always been a problem as far as I know.  I know I have tried it in Creo 2.0 with the same issues.  I have not submitted a case to PTC for this issue.

     

    The issues I have seen are only with converting models to absolute accuracy and using inheritance features.  You do not need to convert old models to start using absolute accuracy.  Both relative and absolute models will live happily together in an assembly.

     

    Absolute accuracy works very well when a part is started with absolute accuracy.  I work with a lot of contoured surfaces (for seat cushions) and complex shapes (for stamped sheetmetal and plastics).  Models tend to lose references and features fail to complete features when converting.  We just do not convert old models to absolute accuracy.

     

    We are working in metric and currently use and accuracy of 0.001 mm.  I have not experienced any issues that I can attribute to absolute accuracy in creating new models except when using inheritance features. 

     

    When creating a new model and trying to inherit a model made with relative accuracy, it will not work.  I always have to change the new model to relative to get an inheritance to work when the inherited model is relative.

     

    Our start models have all been converted to absolute and our old models are not being converted.  There have been no issues with using both relative and absolute other than using inheritance features.  Our mold maker is much happier with the absolute models because he usually remodeled our parts to get the model quality he wanted.

     

    Hope this helps.

    There is always more to learn.
    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire II
    22-Sapphire II
    December 1, 2021

    As shown by @kdirth Creo 7 still supports relative accuracy. The config option enable_assolute_accuracy is not valid in Creo 7+. Creo 7+ uses absolute accuracy by default. If you have legacy models or start parts that use relative accuracy they are still supported.

     

    You can change the accuracy by the following UI selections:

     

    File->Prepare->Model Properties->Accuracy->Change

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