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To improve the treatment accuracy by on-line correction of the paths of the executive working parts (EWP) the authors study the processes of loading, deformation and arrangement deviation of the elements of the manufacturing systems (MS) under the changes of the cutting force components in the process of turning on machine-tools equipped with CNC systems of PCNC class. Estimation of the values of the technological components of the cutting force P[x], P[y], P[z] is based on the phenomenon of arrangement deviation deltaomega[i] of the elements monitoring the servo drives of machine tools. To determine the compliance of the deviation magnitudedeltawi with the technological components of the cutting force P[x], P[y] a diagnostic subsystem was developed, involving the loading devices and dynamometric equipment. The diagnostic system is controlled through PCNC with the application of a specially developed hardware-software system. The data on changes in the values P[x], P[y] and the respective changes in the attitude misalignment parameters in servo drives at various EWP minute feeds in CNC machine tools were determined by prior diagnosis of load characteristics servo drives, registered in the PCNC. So, the data of cutting force components P[x], P[y] compliance with arrangement error ratios deltaomegaX[п] , deltaomegaZ[п]. were established.