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mcvueiadh1-Visitor
1-Visitor
September 16, 2015
Solved

Thicken range, change the minimum

  • September 16, 2015
  • 2 replies
  • 8527 views

Hi everybody,

I have to thicken a huge surface (however it is as simple one) roughly 500 by 2500 mm. I would like to thicken it on 3 mm but I can't the minimum value possible of the range is around 5.5mm. I made different tests and I guess the thickening range is calculated based on the dimensions of the surface. Am I right ? Is there a way to change it ?

Because even if I thicken this surface on 3 mm there will be no collision. I tried with a mere plane surface, a simple rectangle of 500 by 5000 mm but it wouldn't thicken it with 3mm.

I'm using Creo 3.0

Thank you for your help and sorry for my broken english.

    Best answer by MartinHanak

    Matthieu,

    I did this test:

    • I created new parts (millimeters, default relative accuracy 0.0012)
    • I created Fill surface - rectangle 500x5000
    • I tried Thicken feature - it refuses thickness smaller than 6 mm
    • File - Prepare - Model Properties - Accuracy - Change ... I changed relative accuracy from 0.0012 to 0.0001
    • now I can create Thicken feature with thickness equal to 3 or 5 or 5.5 mm

    So it is evident that the problem is related to model accuracy. There is huge difference between thickness and other dimensions.

    Martin Hanak

    2 replies

    B
    bgruman1-Visitor
    1-Visitor
    September 16, 2015

    Set your model to absolute accuracy.

    File - Prepare - Model Properties - Accuracy - Change...

    Choose "Absolute" and set a value.  (I typically use 0.05 for metric parts)

    Good Luck

    Bernie

    Bernie Gruman

    Owner / Designer / Builder

    www.GrumanCreations.com

      B
      bgruman1-Visitor
      1-Visitor
      September 16, 2015

      BTW,  the steps listed are for Creo2.   Don't know if they are the same for Creo3...

      D
      danderson1-Visitor
      1-Visitor
      September 16, 2015

      Most likely you have a surface with a radius or curve  that when offset approaches 0mm or trys to go inverted or negitive. Try creeping up on it and have shade with edges turned on. Look for features that get smaller as you gradually increase the thickness. Hope this helps, Don Anderson

      M
      MartinHanak24-Ruby IIIAnswer
      24-Ruby III
      September 17, 2015

      Matthieu,

      I did this test:

      • I created new parts (millimeters, default relative accuracy 0.0012)
      • I created Fill surface - rectangle 500x5000
      • I tried Thicken feature - it refuses thickness smaller than 6 mm
      • File - Prepare - Model Properties - Accuracy - Change ... I changed relative accuracy from 0.0012 to 0.0001
      • now I can create Thicken feature with thickness equal to 3 or 5 or 5.5 mm

      So it is evident that the problem is related to model accuracy. There is huge difference between thickness and other dimensions.

      Martin Hanak

        M
        mcvueiadh1-VisitorAuthor
        1-Visitor
        September 17, 2015

        Thank you guys for your help !

        The accuracy did worked.

        D
        dgschaefer21-Topaz II
        21-Topaz II
        September 18, 2015

        FYI - Relative accuracy drives the smallest allowable edge by the model size, as you've discovered.  It's a ratio. 

        Absolute accuracy sets the actual dimension of the smallest allowable edge.  It is unit dependent, so in a MM based part setting your absolute accuracy to 0.0001 means Creo will be allowed to create edges as small as 0.0001mm.  0.0001 is a good value for inch parts, 0.002 is fine for metric parts.

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