iges model distorted after imported to Solidworks

Dec 06, 2005 2 Replies
J

Hi, I am facing a problem when importing a curve iges surface. It seems to me the curve surface is actually distorted after import to Solidworks.



The surface consists of entity:



128 - nurbs surface
126 - nurbs curve
102 - composite curve
142 - curve on parametric surface
144 - trimmed surface

I then saved it as another iges file by using Solidworks then compared the original iges file with the new one.



I found that the control points at type 128 and 126 are same bt. the 2 files. However the knot vector and weight are slightly different.



I tried different setting and the result remain the same ie solid : case 1. try form solid case 2: knit surface case 3: do not knit



I wonder if this is a common issue? Is there solution ?



I wonder appreciate if someone can give me some advice here.



Thank you.



jeff



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S

Have you tried import diagnostics? I know when I get iges files sometimes, they have gaps or missing faces, and import dianostics ha repaired them every time. With Iges files you will find that most of the time, the native model is the one with the errors even though you may not see them. I have been shown where you take a model that you create, save it off as an iges, and bring it back in. In a particular case, it all of a sudden had errors.

So I would try import diagnostics first off.

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J

the orignal no. of degree for all the curves is 1. However after imported to Solidworks, the number of degree has been incresed to 3. This really confuse me. There is only one curve surface that I import to. So this should be a stright forward thing, simply read in the data as defined in the original file. However it seems to me the kernel has done additonal work. Is this very common? Please correct me if I am wrong. thanks

jeff

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