B. Draw the Shape

Draw a simple extrusion and lock to the reference planes. Select and apply a radius label to control the radius once loaded into the parent family. Then, select that label and make a new parameter for it.

C. Add Reference Planes

Do the same thing that you did in the parent family: create a reference plane height and lock extrusion to the top and the bottom. Make sure to lock the top and the bottom, then test it out and make the family reflect the height of the table legs.

D. Add a Diameter Parameter

Since most people don't think in radius, we are going to add a diameter parameter that will eventually be controlled in the parent family. Add a new formula (Diameter / 2) which will make the radius report as half of what it is.

E. Assign a Material

Make sure you assign a material so that it can be controlled in the parent family.

F. Draw Support Pieces

An example of a support piece for the table is the brackets that are connected to the tabletop. Give the support pieces some definition, but don't draw every detail.

Tip:  Don’t model everything in Revit, it can really slow down the model and it’ll take a while/be quite frustrating. Be careful while picking and choosing what to model. Ask “what’s a good representation of this and what is overkill?”

4. Add the other family into the parent family.

A. Open the Parent Family

Add the new leg family that you just created. This piece of geometry is constrained in-and-of-itself so if you create several instances of it they will all act in the same way.

B. Add Reference Planes to Help with Placement of Multiple Families

Draw reference planes offset from the left, right, front, and back. These reference planes will determine where the table legs will lie inset from the perimeter of the table. Assign the same perimeter parameter (say that five times fast) to all of the table legs and name it (for example, leg offset). Make all of those references "not a reference" since no one needs to snap to these locations.

C. Edit the Added Family

By selecting the nested family, you can associate all of its parameters to the parent family. This means you can assign each of the parameters to the parent then edit it there rather than having to select each nested component and edit it in each dialogue box.

D. Label New Parameters

The dialogue box will ask where you want to associate the parameters. In this tutorial, we named the parameters the same way except for adding “leg” at the end to differentiate parameter labels. You don't want to be trying to edit the height of the table and accidentally change the height of the leg, so try to think ahead and make sure things are labeled in a clear way.

E. Make Everything the Correct Size

In order to make the table leg report to the height of the table, you’ll need to add a formula (height-thickness).

5. Finalize your Revit family.

A. Add All Pieces

Put the leg in place and make several instances of it. Now that this is done, all 4 of the legs will act the same.

Optional:  Swap Out for Another Leg Style

Take the nested piece and add a label (this allows you to swap it out for another family in the same category). Make the other leg style by editing the family with the desired features and saving it as a new one. Swap out the other legs to the new one and you're good to go!

B. Add Parameters and Constraints to the Family

Now that you have your table set up, think about all the other parameters and constraints you might want to add to this family. For example, you don’t want someone making a 300’ table. Test these values out to make sure they respond in the way that they are supposed to.

C. Add the Parameters on the Draw

You have to associate the parameters to the constraints so they don’t move if they don’t meet the condition that is found. Do the same thing with the nested family. If you don’t, the formulas won’t do anything and the geometry won’t respond as you had hoped. Also, make sure to use the constraint parameters in the formulas or they won't work.

D. Test the Family

Make sure to test out your family and make sure that it works. This stage is very important especially if it is being sent out to other users.

E. Make Preset Family Types

By creating a few preset family types, you can express the design intent and provide the different variations you were intending to have for this family. If you create more than 6, make a type catalog (.txt file) that goes along with the Revit family.

F. Finish Adding Materials

Apply a tabletop parameter and assign a couple of materials (you can use the generic materials). Make the materials use their render appearance.

G. Clean Up the Preview

Hide the host in the families on a different layer to clean up the file preview images. Click "Save As" and select the "3D View: Preview" in the dialog box.

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• 6. Test out your new Revit family.

Open a new project, load it in and test it out!

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