I decided to design the table shown in the headline picture. It's a table built in cardboard's pieces assembled interlocking.

I created a folder on my desktop in order to have all the pieces of my table in one place.

I started to design the table opening a new family, this family will be my "Tavolo - famiglia madre" (table - mother family). This is the main file where i'll be assembling all the pieces of the object. I opened the new family, and choose GENERIC METRIC MODEL.

First of all I changed the units of the file in in meters. It's important to set the dimension of the object parametrically. In order to do so I used the command REFERENCE PLANE, (p.1) and locked the dimension. I did so in the plant and front view. (p.1 p.2)

p.1 

                    p.2

After I set theReference pPlane I added the parameter using the command FAMILY TYPES. (p.3) With this command I was able to create parameter to assign to each dimension. When I create the parameters e.g. lunghezza, profondità their value was 0.00 that's because they weren't assigned to any object. After they were assigned to an object the value changed (p.4)

p.3p.4

After this I saved my document in the folder "Table". Every object in the folder will be named "Tavolo - x" in order to have everything organized and the metadata well defined.

Now I have to design the pieces of the table. The mother family is composed by four sub-family: Tavolo - Gamba, Tavolo - Ripiano, Tavolo - Sostegno e Tavolo - Sostegno2. (p.5)

I'll explain the constroctruction of only one of this pieces (Tavolo - Ripiano) since the modus operandi is always the same. 

I used the command OPEN, NEW FAMILY, GENERIC METRIC MODEL. As for the mother family I set the main dimension with the command REFERENCE PLANE and add a parameter to each dimension.  I used the command CREATE, EXTRUSION and draw a circle. The ray of the circle is locked to the reference plane so that when the parameter of the reference plane changes the lenght of the ray changes as well. (p.6) I did so also for the thickness of the shelf. (p.7)

p.6p.7

After this my drawing of this part is complete. (p.8)

                                               p.8

The other parts are: Tavolo - Gamba (p.9), Tavolo - Sostegno (p.10) e Tavolo - Sostegno2

p.9 p.10

It's important to say that in order to design the joints of the legs and the crutch (p9, p.10) I used the command VOID EXTRUSION. This allowed me to subtract matter to the main object and create a void.

After this I opened again my mother family in order to combined all the pieces of the table. The shelf is glued to the legs of the tabels. The legs are held togheter by the crutch that are interlocked. I used the command LOAD FAMILY and then PLACE COMPONENT in order to virtually build the table.

I loaded the family "Tavolo - Gamba" four times. and then put it all togheter. (p.11,p.12,p.13)

​p.11

        p.12p.13