Launch the drawing module (CAD) from charlyGRAAL and define, in a first places, the volume and the general properties of your drawing.

Click on «New file» icon or on the sub-menu «new file» of the file menu. The window of properties appears on the tab «general» ; you are going therefore to indicate in the different fields the volume of the drawing that you will execute X= 100 ; Y = 50 , Z = 1.6.

You are also going to give the step of the grid ; for this exercise, it will be at : 5mm