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RJ_98351071-Visitor
1-Visitor
March 10, 2021
Question

Unable to enter desired wall thickness for formula driven lattice

  • March 10, 2021
  • 3 replies
  • 1314 views
I am using Creo Parametric 7.0 7.0.0.0

When inputting value for formula driven lattice -> cell fill -> wall thickness, I enter 0.1. Error message says: you have entered a value 0.1000 that is out of range (0.5100 to 1000000.0000) Click OK to correct, or Cancel to return to the previous setting.

Is this just an inherent limiting feature of the Creo lattice functionality? It seems to make it so that only extremely large or extremely bloated lattice structures can be created.

    3 replies

    T
    23-Emerald IV
    TomU23-Emerald IV
    23-Emerald IV
    March 10, 2021

    Sounds like a part accuracy issue.  Are you using absolute accuracy?  If so, what is it set at?

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire II
    22-Sapphire II
    March 10, 2021

    Creo 7.0+ uses absolute accuracy by default in the supplied templates, if you are using a custom start part then you may not have absolute accuracy in the model.

     

    Check the envelope quilt surface can be offset to the desired value before applying the lattice. Select the outer wall and offset that quilt to the inside by the desired value. If this surface will not offset, that could be the source of your problem. It is difficult to tell without seeing the model.

    R
    RJ_98351071-VisitorAuthor
    1-Visitor
    April 16, 2021

    Changing the accuracy was helpful.  However, even when the accuracy is the smallest permitted value (0.0001), I am unable to create the desired wall thickness for the lattice and fill the desired geometry size.  After some trial and error, it appears that for a 0.1mm wall thickness lattice, the maximum size of geometry that can be filled is ~9x9x9mm.

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