In this paper an adaptive axial force control for gun drilling of small drilling diameters is presented. The system is applicable to CNC drilling and gun drilling machine tools, which are equipped with a fast analog NC input and an axial force measurement system. An online identification algorithm discretely investigates the actual transfer function of the control path. Based on this information proper controller parameters are allocated. Experimental tests of the adaptive control system show the functionality in drilling a material transition from steel 100Cr6 into cast iron ADI 800 and exemplary illustrate the disturbance reaction, introduced by activated changes of the path behavior.

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