The paper is devoted to the study of the relationship between the vibration accelerometer signal and the fill level of a ball mill. It was established that there is a direct correlation between the vibration level of the front support of the mill drum and the amount of material being ground in the mill. A low vibration level corresponds to a high fill level of the mill. Two methods of processing the vibration accelerometer signal to obtain a fill level signal using a moving window are proposed. In the first method, the frequency spectrum is built and the maximum is determined in a specific frequency range. The second method consists in calculating the integral of the modulus of the vibration acceleration signal during the time of the moving window. The operation of each method is demonstrated based on the experimental data of vibration acceleration signals during the work of two ball mills at operating conditions.
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