How to change nested family params in the host family properties

[info]

Hello to all,

I am strugeling with a problem in my family file: see attachment Structural-beam.

I have nested the family Damwand into it, but I can get it connected by the host.

What I want is to control the height of the Damwand extrusion (same param-name as in the host) and the numbers of arrayed elements.

But when opening the host params, I don't see those 2 params of the nested.

I am quit new to Revit and searched the fora but didn't find a solution.

Can anybody help me out?

Thanks in advance!

[barthbradley · Accepted solution]

You need to create the parameters IN THE HOST  to drive the parameters in the nested family. You ASSOCIATE  the the two parameters together in the host.  

https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/CloudHelp/cloudhelp/2017/EN...

[info]

Thanks for the quick reply and link. I already looked at that page, but in my nested type properties I haven't the possibility to click on a button on the far right, because there is simply no grey button.

I can't figure out what went wrong.

When I make the height of the Damwand nested family the same param as in the host, it gives me a contraint error...

[barthbradley]

Make them INSTANCE Parameters (in nested Family).  

[info]

Here are my latest files.... It seams me the easiest way to align the damwand nested to the ref planes at bottom and top in the host...?

[barthbradley · Accepted solution]

Okay, so  I see your family. I'd do it a little differently though. I'd Array in the host, not in the Nested Family.  And, I'd constrain just the bottom of the Arrayed Element and associate it height parameter (Instance kind)  to a host parameter.  That not work for you?   

[info]

Thanks for all the quick replies!

No, I couldn't make it work for me. Perhaps I am doing something wrong, because I am a newbe to Revit.

Can you please share that model to me, so I can have a look what I do wrong?

Thanks...

[barthbradley]

.

[info]

Thanks a lot for helping me as new-one in Revit!!

I now see how you did it...

I completed the family, but have one problem with a void on the end. See attachement if you are willing to help and know how to solve this?

I want to cut the last arrayed structure and placed a void on the end. But is doesn't cut.

I looked a lot on the internet and fora and saw that it has something to do with the order of the family.

If I see it well, the void won't cut, because the array is placed later?

Do you, or something else have an idea how I can solve this?

Thanks a lot again!

[barthbradley]

I'm looking at you family and trying to understand what it is that you are trying to cut out. That flange tip?  You can't.  

[info]

Yes that curved flanged wich is arrayd.

When it's impossible to cut that this way, my family failed how it's now made... 😞

[barthbradley]

The array can't be cut in this way,  but you could end the array with a minus one and then model a separate "Damwand" just for the end.  You could then cut that one with a void.  You could even parameterize the cut depth to meet different conditions. But, that's a workflow that is hard to explain.  Do you get the concept though? 

[Mikeymore]

I made the changes and got it working !!

Thanks for all the help!

Cheers...

[barthbradley]

What did you do?  What I said, or did you come up with another way to do it? 

[Mikeymore]

No new insights, just exactly how you suggested.