Set of plates or parts obtained by cutting a block of metal or composite material

A set of plates or parts obtained by mechanical cutting from a block of metal or hard composite material, wherein the block extends around a plane, wherein the block has a length, a width and a thickness, wherein the set comprises a first plate or part having an upper face and a second plate or part having a lower face, and wherein the set of plates or parts and the block are characterized in that:

• the upper face has a surface with at least two lines of inflection parallel to the length with respect to the plane;
• the length is greater than or equal to 600 mm;
• and
• the lower face has a surface of a shape that complements the upper face of the first plate facing it, the plates or parts being distant from one another of a constant height corresponding to a cutting line thickness in the block, wherein the cutting line thickness is between 1 centimeter and 2 centimeters.