This news article was originally written in Spanish. It has been automatically translated for your convenience. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace a human translator. The original article in Spanish can be viewed at ¿Las MMT en lazo cerrado?
Dimensional Metrology

The MMT in closed-loop?

Ferran Puig, Director of MetalUnivers15/11/1999
Imagine a system of control of closed loop in which it acts a machine to measure. It is not a crazy idea to think that actions on the manufacturing process can be taken with the value and direction of the error. We are going to be a little more ambitious and consider that corrective actions are generated automatically by a calculation algorithm more or less sophisticated.... the result it would be surprising, we could remove the "rejected parts" area of our factories.
Although from a theoretical point of view, this reasoning is possible, its application to the real world is a bit more complex.

Firstly, not all manufacturing processes in which the dimensional control of the product is crucial, allow modification in real-time of the variables of the process itself. In other cases it is impossible for the nature of the line of production (line transfer versus machining centers) that he sacrifice flexibility for productivity. Finally we cannot forget that in most cases it is difficult to establish a direct relationship between the cause and the effect produced by a variation of the control parameters, either due to ignorance of the process itself or difficulty to describe / make this relationship.

There are specific applications that work satisfactorily closed control loops, where the sensor is a MMC. As a general rule the error signal acts on the program of machining of one machine numerical control, on the basis of the trend rather than the absolute value of the measurements. In short, we are compensating for the degradation of the machine or the wear of the cutting tool, action not insignificant if we take into account the savings in time (maintenance) and money (the cutting tool change) that this represents.



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