Cutter chatter monitoring method

A cutter chatter monitoring method, comprising the steps of:

• capturing a cutting vibration acceleration signal;
• retrieving the cutting vibration acceleration signal in each predetermined time period;
• dividing the cutting vibration acceleration signal in each predetermined time period into a plurality of segments;
• determining whether an increased multiple of cutting vibration acceleration signals of each segment is greater than a threshold value;
• performing a fast Fourier transform of the cutting vibration acceleration signal in each predetermined time period;
• calculating a vibration frequency of the cutting vibration acceleration signal processed by the fast Fourier transform;
• determining whether the vibration frequency of the cutting vibration acceleration signal is increased by a multiple of a cutter passing frequency, wherein the cutter passing frequency is determined by a main shaft rotating speed S and a number of cutters N;
• and
• increasing a main shaft rotating speed of a cutter, when the cutting vibration acceleration signals is increased by a multiple greater than the threshold value and the vibration frequency of the cutting vibration acceleration signal is a multiple of the cutter passing frequency.