Abstract: This invention addresses technical problem of optimizing output of a melt cascade, which is used in production of mineral fiber (so called mineral wool as known in state of the art being stone wool, slag wool or other type of mineral wool). These technical problems are solved by steps of determining (a) trajectory of movement of a melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector, and further by regulating of movement of melt stream (i.e., drop mass), said regulation mostly achieved through variation in point of contact of melt and rotating wheel or plurality thereof. This is achieved by determining three key parameters: (a) trajectory of movement of melt stream, (b) melt concentration relative to surrounding air between the first and the second rotating wheels, and (c) movement vector, and further by analyzing these three key.