a rough set-based fuzzy control method was developed. The method gets rid of the disadvantages of over many fuzzy rule numbers and complicated calculations toward high-dimensional input fuzzy system. On the MATLAB platform
spindle motor’s 3-phase current signal data were on-line produced. Then connotative wear state information of micro-size drill was obtained and on-line monitoring to micro-size drilling process was performed. Results show that when monitoring threshold value is properly selected
the breakage of micro-size drill will be effectively avoided.