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Strange length loss after trimming a model

User: "Altair Forum User"
Altair Employee
Updated by Altair Forum User

Hello,

I have a half cylindrical structure trimmed into two parts (as shown in the picture).

 

When I measured three parallel edges (point 1-2, 3-4, 5-6), I found the edge 3-4 in the middle has different length, 1.557mm, from the rest two (1-2, 5-6), 1.558mm. The difference is small, but I'm perplexed about length inconsistency because the half cylinder is simply trimmed with a vertical line in the middle. It is a simple trim. The angles 124, 243, 431, 312 are all 90 degree. Edge 1-3 and 2-4 have equal length. I just cannot understand why the edge 3-4 is shorter than the edge 1-2 after trimming. It does not make sense mathematically. Any thoughts will be appreciated, thanks!

 

Ryan

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    User: "Altair Forum User"
    Altair Employee
    OP
    Updated by Altair Forum User

    Hello Ryan,

     

    i have tested it with a surface and for me it works perfectly.

     

    Maybe you have attached geometry and/or the merge tolerance for geometry is still high. Check options->geometry->cleanup tol, must be useful with your model size.

     

    Regards,

    Mario

     

    <?xml version="1.0" encoding="UTF-8"?>post-817-0-17657800-1398402696_thumb.jpg

    User: "Altair Forum User"
    Altair Employee
    OP
    Updated by Altair Forum User

    Mario, what value setting might be proper for cleanup tol according to model size?

    User: "Altair Forum User"
    Altair Employee
    OP
    Updated by Altair Forum User

    Hi,

     

    i'm still working with millimeter, so i'm using for geometry cleanup tolerance 0.01 (or 0.1 for larger models) and for node tolerance 0.1

    But it is by you to choose a good value.

     

    Regards,

    Mario