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Thread: BMU (Building Maintenance Unit) - Advice Req'd on Making a Family

  1.    #1
    Senior Member kamranmirza's Avatar
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    BMU (Building Maintenance Unit) - Advice Req'd on Making a Family

    Hi All,

    I'm going about making a BMU family for the rooftop of a high-rise project we're working on. I've tried looking on the forum but no mention of such a thing.

    The BMU itself will be a mechanical equipment family; could be any number of family types but I want to control its visibility with other mechanical equipment on the roof.

    The difficulty I am having is how to model the rail / track that the BMU sits on.The rail / track normally follows the edge of the parapet, so it is dependent on the edge of the roof.

    For making the family I am working along these lines:

    1. The mech. eqpmt. family BMU (with a parametric gondola) hosted on #2 below:

    2. The rail / track made from a profile following a line drawn as per roof edge sitting on #3 below:

    3. Sleepers made as arrayed (either in the family with global parameters as per Revit Cat's recent blog) or arrayed in the model. These arrays will have to be set up manually as I can't understand how to run the array to follow the rails in #2 above.

    Question: Does anyone have any ideas of how to make a rail / track with arrayed sleepers that follow a line ?

    Image below showing intention:

    BMU (Building Maintenance Unit) - Advice Req'd on Making a Family-bmu-plan-section.jpg

    Thank you in advance.
    Last edited by kamranmirza; July 31st, 2019 at 10:08 AM. Reason: General re-write

  2.    #2
    Moderator cellophane's Avatar
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    Assuming you don't mind having multiple families for the track assembly - the straight segments of the rail & sleepers can easily be arrayed in the family and controlled with some formulas. This could be a line-based family or instance based, depends on what functionality you want / need later on. The radius can also be done this way, but it gets complicated quickly. If your radius is the same everywhere, it might be easier at first to just make that piece static.
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  3.    #3
    Senior Member kamranmirza's Avatar
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    Hi Chad. Interesting. So to summarize your suggestions, you're saying I make a toy railway type of arrangement with straight sections, that I can set the lengths to, instance-wise, and curved bits with either fixed radii (very likely this will be the option) with an instance-angle or an all in one variable-radii curve if I have the time to make it geometrically.

    BMU (Building Maintenance Unit) - Advice Req'd on Making a Family-bmu-toy-railway-pieces_1.jpg

    Nice one = sublime !

    Should have thought about that. Whether in Revit or wood, plastic or metal, it's been being done for decades for kids.
    Last edited by kamranmirza; July 31st, 2019 at 03:11 PM.
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    Moderator snowyweston's Avatar
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    I'd be inclined to use a railing and let the BMU subbie to the rest.

  5.    #5
    Senior Member kamranmirza's Avatar
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    Quote Originally Posted by snowyweston View Post
    . . . and let the BMU subbie to the rest.
    Hey, contractually-wise you're totally right.

    Our team are taking this to DD (Stage-3 / 4) only and handing over to our partners and we'd like to make our drawings look top-notch for that team and the costing team, etc., and to convey as much design intent on our sheets as possible before the handover.

    We've got the facade maintenance consultant's CAD layout and equipment drawings and I know your answer applies to all of my responses too but this is something that has been a wish-list family for almost a decade now and I finally have a chance to complete it, so pleeeeeaaaase don't stop me !!!!!!!!!!!

  6.    #6
    Senior Member kamranmirza's Avatar
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    Quote Originally Posted by snowyweston View Post
    I'd be inclined to use a railing . . .
    Another good idea - can I host the BMU to a railing ??? TTGT (TimeToGoogleThat)

  7.    #7
    Mr. Revit OpEd
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    +1 for railing - use the Support sub-feature for Handrail type for the anchor/supports and you can move them anywhere along the railing you need them after using a basic spacing rule to place them roughly. A railing could "host" the BMU if it is a support too, or post/baluster.
    Last edited by Steve_Stafford; July 31st, 2019 at 04:37 PM.
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  8.    #8
    Senior Member kamranmirza's Avatar
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    Quote Originally Posted by Steve_Stafford View Post
    +1 for railing . . . A railing could "host" the BMU if it is a support too, or post/baluster.
    Thanks for that that - so many good ideas today !

  9.    #9
    Moderator cellophane's Avatar
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    Your summary of my post was pretty much spot-on, although after reading through what everyone else said I would lean towards a railing as well. There are tradeoffs either way, it is just a matter of where you place your effort

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