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Thread: Grid Array for Familly

  1. #1
    New Member AaronJClark's Avatar
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    Grid Array for Familly

    Hi Folks,
    Aaron here. Iím trying to create a parametric concrete encasement. The idea is to have a solid box of concrete with a grid of empty tubes through it for cables. As the amount of those tubes can change depending on a number of factors I want to create something flexible to handle this.

    Iíve been using void extrusions in an array through a solid extrusion. Iíd like to have the void extrusion in a grid where I could control with a parameter how many times its arrayed both across and up and down. So far Iíve only been able to make one row and one column. Any ideas would be appreciated on how to get this knocked out.

    I've posted where I'm at and the family itself but am still struggling to get the tubes to array into a grid.

    Thanks guys,
    Aaron

    Grid Array for Familly-2015-11-19-11_29_48-autodesk-revit-2015-%5Belevation_-front-parametricencasement.rfa%5D.pngGrid Array for Familly-2015-11-19-11_29_11-autodesk-revit-2015-%5B3d-view_-view-1-parametricencasement.rfa%5D.png

  2. #2
    Forum Co-Founder Alfredo Medina's Avatar
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    Welcome to the forum, Aaron.

    I wonder what the benefit would be, of doing such a family with so many voids (which are slow families that affect performance of the model), considering that MEP has a Discipline parameter, especially configured to give priority to the MEP systems over the architecture or structure of the building. If you simply create your conduits inside the concrete floor, and set up the view to Electrical, your conduits are going to be visible through the slab, as shown on this image below.
    Attached Thumbnails Attached Thumbnails Grid Array for Familly-2015-11-19_14-49-54.jpg  
    Last edited by Alfredo Medina; November 20th, 2015 at 12:09 AM. Reason: spelling
    Ning Zhou likes this.

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    Member Lkenshalo's Avatar
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    Hi Alfredo, thank you for the reply. Aaron and I work together at Rushing Co. in Seattle.

    I agree with you that in a BIM environment modeling the conduits is ideal, however, the banks Aaron is looking to create will likely never see placement in a BIM model.

    They're build in revit, sometimes in concert with an architectural model, then exported to AutoCAD and placed on a sheet. We've considered that we could easily do these in AutoCAD but welcome any opportunity to work in revit as it sharpens our modeling expertise.

    Currently we're modeling duct banks with sweeps and profile that describes the conduit sizing and spaces. I believe Aaron is trying to make a parametric family that we can quickly adjust per instance, he may be able to offer more clarity on the family creation side as I am not involved in that.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Honestly, i would make it as a nested Face Based Family, where the face it hosts to is the top (or bottom) side of the concrete. Then you can have instance parameters for the offset from that face. So the *start* of each row is a different instance of that family, with different instance parameter values. The crummy part is arraying a Face Based Family (in another family) almost always means it loses its association to the host (face), and it stops cutting. So you wouldnt be able to use the array, you would have to have them all there, and then use wonky parameter formulas to shove them *out* of the concrete when the user turns them *off* (you cant just make them not visible, since they are cutting a hole still).

    All that is to say, if you DO need to model the void, i would make the single family be a vertical row, and i would place the vertical rows in the concrete manually. Youll end up fighting with it less.

    BTW, Alf makes a great point, that all of the above is only really valid if the concrete is in your model, or your family. If its in the Structural Model (hint: it generally should be in the structural model), you cant *cut it* anyway. At that point, might as well use MEP System Families to show it (Pipes, Conduits, etc), since it wont cut regardless.

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    New Member AaronJClark's Avatar
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    Thanks for the reply everybody.

    "i would make the single family be a vertical row, and i would place the vertical rows in the concrete manually. You'll end up fighting with it less."


    That would certainly be easier for me. I was hoping there was a way I could make it parametric so other modelers had an easier time and eventually I'd like to do something similar except using a sweep but also to be perfectly honest, partially because I think flexible families are really cool.

    I was thinking there might be another workaround with making the shape for extrusion parametric but I haven't played with it yet.

    As to using conduits for cables, in past companies that's exactly what I've done but here we regularly get specifically asked to model the encasement itself.



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    Forum Addict josephpeel's Avatar
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    Why not just make the whole concrete beam as a single extrusion with the holes drawn in the extrusion sketch?
    One operation, no cutting or sub families.
    Making it parametric is then just a matter of moving the 2D circles around in the sketch.
    Last edited by josephpeel; November 26th, 2015 at 03:34 PM.

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    Member Lkenshalo's Avatar
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    Quote Originally Posted by josephpeel View Post
    Why not just make the whole concrete beam as a single extrusion with the holes drawn in the extrusion sketch?
    One operation, no cutting or sub families.
    Making it parametric is then just a matter of moving the 2D circles around in the sketch.
    This is exactly what we're doing now. I'm actually perfectly happy with this but Aaron though he may be able to make a parametric family that we could adjust for each instance so someone who may not be as revit savvy could create these banks.

    Thanks all for the replies!

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