Abstract
This paper presents a method of adaptive control of tapping in order to perform high speed, high productivity tapping by using newly developed intelligent machine tools. This method means changing acceleration rate and cutting speed of tapping by means of the value of cutting torque by monitoring cutting force with internal sensor. To use this method, the cutting torque increase is not so sharp at the hole bottom vicinities because of prevention of chip jamming. In order to inspect the productivity and safety of tapping, a new algorithm is proposed and a new NC system is fabricated. As a result, productivity improved 32 % experimentally as compared with conventional system.
