Parametric programming is used for products that are similar or of the same family in which variable parameters and parameters that may be traced back to the first through mathematical formulas can be identified. In this mode the machine is simply programmed by inserting the variable parameters and the quantities to be produced for each piece. This is the most commonly used system in the manufacture of door panels and frames, reinforced and fire doors, industrial and overhead doors, metal furniture, lighting and ventilation elements and in many other sectors.