Monday, March 29, 2010

How to modify a door family - Part 1

This is Part 1 of a hack to modify an existing door family to more accurately match actual construction.  The results appear to work but are not rigorously tested, so make a backup first.

Door families with hollow-metal frames are out there, but haven't come across one that creates a rough opening correctly out-of-the-box. Example using one of the doors downloaded from Reed Construction's SmartBIM: Probably any of Reed's flush doors with a hollow-metal frame will do; I'll be looking at 'Door_Single_Glazed-1-Lite_Reed'. We're ahead of the game here already compared to Revit's default doors because it's a complete frame, not just trim that only appears in 3D. Both doors pictured are 3'0. The 'before' door is cutting a 3'4 rough opening. What's needed is a 3'2 R.O. per 'after'.
 
Open the door in the family editor and go to the Ref.Level view. Selecting items reveals a network of constraints. Of the various ways to revise the family, it seems that altering the frame sweep profile affects
the fewest constraints. Select the door frame and choose Edit Sweep-> Select Profile-> Edit Profile from the ribbon bar. Should see something like this:Select all the lines and arcs that make up the frame and move them 1" to the right. About five "constraints are not satisfied" errors will result. Hit Remove Constraints, Finish Profile, and Finish Sweep. Another "constraints are not satisfied" may appear, so again hit Remove Constraints. We'll get back to tidying the necessary constraints.

The hollow metal frame overlaps the wall an inch, good, but now the door panel is too narrow for the opening. Likewise the detail item (plan view swing) is too small. Hit Types on the ribbon bar, scroll down to the Dimensions heading within the Family Types dialog, and change the height and width. It's probably 7'-2" and 3'-4". Change it to 7'-1" and 3'-2", the rough opening size for a standard 3' x 7' door frame. Now scroll down further for the truly sneaky but elegant part... under the "Other" heading are the formulas for the door panel size. Originally it's subtracting 2" all around but should be 1". Change the formulas to match the following:



Hit OK... part 2 to follow.

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