Forums >> Revit Structure >> Technical Support >> Use Nested Void Family to Cut Host?

mfleming

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Joined: Wed, Oct 20, 2010
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Hi.

I'm trying to create a face based void that is nested into my main family to cut the solids.

My end result is using array to array the nested void family with parameters controling the qty bases on the "Beam" length.

I have tried creating the voids within the main family and arraying, but the array creates errors so I think I need to nest the void family?

Suggestions?

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itsmyalterego

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Joined: Thu, May 28, 2009
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Oh, hahaha... is this a boat?  I thought those looked like portholes. So the 'beam' is your length.  At first i was wondering why you'd cut holes in a beam shaped like that.

I have had horrible luck with arrays controlled by length parameters.  In some cases, it is simply broken, such as if you attempt to also give your arrayed object a width parameter.  I've had arrays that should have scaled upward nicely veer off at an increasingly oblique angle after a awhile.  It makes no sense.

what sort or error are you receiving?

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mfleming

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This is a composite Deltabeam.  The holes allow the concrete to fill the beam allowing a composite beam.  Used for hollowcore bearing beams mostly.

Anyways, isn't there a way to use a void family to cut a second family?

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TKennedy

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Joined: Wed, Oct 7, 2009
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A nested face based family should work. If you're still having problems it would probably be helpful to post the family for troubleshooting.

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mfleming

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Yea I cant get it to cut anything.

I have attached my Revit 2011 family.

The one side of the beam I have placed two nested void familys (I will eventually array these using 300 c/c spacing, 150 from each end) but for now, I just want to be able to cut the beam.

One side of the beam I have tried using non-nested voids with arrays.  (Not the best option and doesn't work fully when I flext the length)

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TKennedy

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I won't be back in the office till Tuesday so I can't test tonight (no Revit on this laptop), but there's a couple things I can think of to check. In the family you are nesting (the 'hole') family, did you make the void extrusion cut the default face (the big block in the family)? In the beam family is the nested family somehow backwards so the void is extending out away from the extrusion instead of into the extrusion?

Sorry, that's all I can think of right now, unless I come up with anything else it will have to wait.

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mfleming

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Yea It is cutting the face.  I also tried cutting the entrie block (it doesn't actually cut anything in the void family though) ie. the big block.

I have also tried switching the void extrusion in case in was upside down.  Still no go.

In my main model it stays "orange" all the time representing a void extrusion.  But nothing gets cut.

See attached

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Typhoon

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Joined: Tue, May 22, 2007
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Select that void and "Edit Family", now use the "Cut geometry" tool, select the void and select the box, load into project, overwrite and its done.

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mfleming

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I didn't think about cutting inside the void family... NICE!

This worked perfectly thank you!

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