In this instructable i'll show how to create simple or complex modular wood structure.
This method is used by professional carpenter but you can do it by yourself, with simple steps.

This is what you need:

- Drill
- Clamp
- Drill tip
- Bolt and screwed nuts (see in photo)
- Meter
- Pencil
- Allen key
- Wood (your pieces for your structure)

You can find all of these parts at the local hardware store.

Step 1: Step 1

Take a piece of wood, note that the depth must be enough to insert the screwed nut, for example if you take screwed nuts of 9mm diameter, the minimum depth can be something like 12mm.

Step 2: Step 2

Drill an hole at the point of union that you want for your structure, is preferred that you insert the screwed nut into the head side of the wood piece, but this is an your choice referred to your structure model.
Note that the hole that you drill, must be depth as long as the bolt minus the width of the other piece that you bring to it.
The hole must be drilled straight with high precision to have the screwed nut inserted easily.

Step 3: Step 3

Now take the screwed nut and how you can see, the first inside part, have an hexagonal design, make for screw driving the screwed nut.
Take the correct key for your nut and screw up to the wood profile.

TIP: If the wood depth is tiny relative to the nut, to be sure not to broken the wood while you insert the screwed nut.

Step 4: Final

Now take the other wood that you would connect to that, and drill an hole part by part, of a diameter just more large of your bolt.

To the part where your insert the bolt, flare the hole for a perfect result (the bolt is preferred that are head smooth type).

The last thing that remain to do is screw driving the bolt and the connection is made.