Robust Control Design for a Spindle of Lathe Machine

This study describes the development of robust control design for a spindle of lathe machine. The dynamic of the spindle is uncertain and time variation due to the deepness variation on cutting process. The dynamics model of a spindle were obtained by system identification. To find a linear model of the system based on the nonlinear system using the data of real time system identification. For obtaining a controller synthesis used linear models and its uncertainty bound with real time system identification. Using the selected input signal, the data of output and responses are acquired and then a nonlinear system identification is performed to obtain a linear model. Practical design steps are presented in which compensator and prefilter-based conditions are formulated to obtain a robust control of a spindle. Moreover, effects of the deepness variation on cutting process and the dynamic characteristics of a spindle are studied and discussed.