Method to control the interference and collision between mechanical members (17, 23) of at least two operating units (11, 111) or one operating unit with respect to fixed positions. At least one operating unit is associated with a position detector or with a position simulator, and is equipped with an electric motor (15, 21) which drives a mechanical member (17, 23). The method is managed by a management and control unit (13). The control of the operating units (11, 111) occurs in two phases, verifying point-by-point the position of the mechanical member (17, 23) as a function of the current dynamics and the braking or acceleration times and spaces (first phase), and verifying point- by-point the intensity of the current supplied to at least one electric motor (15, 21) (second phase).