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SUMMARY A system which enables unattended CNC machining with small diameter long twist drills is described. The system monitors the drilling thrust and torque and controls accordingly the machining parameters feed rate, spindle-speed and tool position in order to ensure safety of the tool and workpiece under high penetration rates during unattended machining. Other functions of the system include tool life monitoring based on feed force pattern and issuing of alarms, data acquisition and display, while its software structure allows for continuous expansion and improvement.
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Kavaratzis et al. (1990) studied this question.
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