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Tracepath 3D - how import to solid part?

Question asked by Piotr Adam on May 24, 2008
Latest reply on May 24, 2008 by Ian Hogg

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When I export 2D tracepath to solidpart is everything OK, but if this curve is 3D in solidpart I have error with "intersections", how bypass this error?
If I try use CSV file with data of this curve I have similar problem...

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Ian Hogg May 24, 2008 12:57 PM
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Hi Piotr,
The limitation in using a tracepath for a spline is that is must not intersect itself. If you have cyclic motion and it goes over the same path multiple times, you will get this error.

The best thing to do is run the simulation for only one cycle or so the part the trace curve is on only goes over the area of interest once.

Another way to correct this after the fact is to export the trace curve to csv, and edit it in Excel crop the data to just one past.

You can then inport that into the spline through points command (make sure there is nothing aside from the xy data)

Cheers,

Ian
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- Piotr Adam @ Ian Hogg on May 24, 2008 2:59 PM
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  Thank You for answer...
  But I'm sure that the path not intersect itself.
  In my mechanism I have three degree of freedom and motion on everyone is built with sum of "STEP" functions.
  If my time simulation is for example 2 s and I have in 1 s motion with STEP function on first degree and in 2 s motion with STEP function on second degree my curve is assembly of two curves. If I export this "curve assembly" to solid part I recive only first of them.
  Why?
  Generaly I have sum of 4 functions in every degree of freedom. (when I use all functions I have problem with intersections)
  
  And problems with curves from table and *.csv files in solidworks:
  If I have a curve in solidworks (for example first part of curve like in history over) and I export this curve to file *.sldcrv and the same file try import again to solid part (for check this transformation) I have another result.
  I know - this problem is from comma "," side, but in real table (for all functions STEP) I can't avoid data without comma (including scaling all object) so changing *.csv file to appropriate form is impossible.
  Apologies for long text and week English...
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  - Ian Hogg @ Piotr Adam on May 24, 2008 7:48 PM
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    Hi Pitor,
    
    If I understand what you are saying, the exported curve only is for the time range of your first step function, not the following step functions. Is that correct? Or is this an issue of relative movement of one part with respect to another and the issue is the reference part?
    
    The first place to start I suppose is does your trace curve give the expected path?
    If so, would it be possible for you to post the exported curve (csv format) to this forum thread?
    
    When we first developed export to csv, it was meant to honor the separator symbol of the given OS language. So many Europeans have a different separator symbol since the decimal is a comma. I can work with it no matter what the separator is.
    
    I should be able to diagnose the issue from the curve in terms of why it is not generated the expected spline in SolidWorks.
    
    Cheers,
    Ian
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Tracepath 3D - how import to solid part?

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