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Thread: Creating Hollow Core Family - Troubleshoot

  1. #1
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    Creating Hollow Core Family - Troubleshoot

    I am currently new to Revit (very experienced with AutoCAD) and trying to create a Hollow Core Family for a project we are working on. The width, thickness and location/size of voids are static, yet the span of the "slab" will be dynamic - obviously the length of voids will be equal to the span length.
    I first created all the refference planes for the slab and then flexed it to ensure the span would adjust accordingly (it worked beautifully). I then attempted to instert the voids by utilizing refference planes at the center of the voids as well as at the outer edges of the "void circle" and then attempted to create the voids by utilizing the Void Extrusion tool. After I did this, however, I would get constraint errors when I attempted to flex the slab.
    I am using "Mastering Revit Sturucture 2010" book as a guide to create this family and Revit 2018. Conceptually, I understand the concept of what needs to be done, but I'm unsure how to get there. I've attached the file for review and any comments you might have. Thanks in advance.
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    Last edited by graylewis; April 18th, 2019 at 02:43 PM. Reason: Adjusted Title

  2. #2
    Moderator Robin Deurloo's Avatar
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    Why use voids and not just an extrusion of the slab including the voids? This way you just have 1 object to lock to your ref planes instead of many of them.

    Did not open your example as I am on my phone right now.

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    Moderator Robin Deurloo's Avatar
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    In the mean time I looked at your family.
    It looks like your Void Start parameter is causing issues, because you have both the Span and Void Start parameter linked to the same ref planes. Either remove the Void Start parameter or add the =span formula to it as you did with the Void Length.

    Not sure why the Void Length or Void Start parameters are there to begin with as they are the same as the Span parameter anyway, right?

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    Forum Co-Founder Alfredo Medina's Avatar
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    Can one of the moderators please move this thread to Architecture - Family Creation?

  5. #5
    Moderator Robin Deurloo's Avatar
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    done !

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